51
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Cha JI, Baik C, Lee SW, Pak C. Improved utilization of IrOx on Ti4O7 supports in Membrane Electrode Assembly for Polymer Electrolyte Membrane Water Electrolyzer. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.01.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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52
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Joo J, Park Y, Kim J, Kwon T, Jun M, Ahn D, Baik H, Jang JH, Kim JY, Lee K. Mn-Dopant Differentiating the Ru and Ir Oxidation States in Catalytic Oxides Toward Durable Oxygen Evolution Reaction in Acidic Electrolyte. SMALL METHODS 2022; 6:e2101236. [PMID: 35041273 DOI: 10.1002/smtd.202101236] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Indexed: 06/14/2023]
Abstract
Designing an efficient and durable electrocatalyst for the sluggish oxygen evolution reaction (OER) at the anode remains the foremost challenge in developing proton exchange membrane (PEM) electrolyzers. Here, a highly active and durable cactus-like nanoparticle with an exposed heterointerface between the IrO2 and the low oxidation state Ru by introducing a trace amount of Mn dopant is reported. The heterostructure fabrication relies on initial mixing of the Ru and Ir phases before electrochemical oxidation to produce a conjoined Ru/IrO2 heterointerface. Benefitting from electron transfer at the heterointerface, the low oxidation state Ru species shows excellent initial activity, which is maintained even after 180 h of continuous OER test. In a half-cell test, the Mn-doped RuIr nanocactus (Mn-RuIr NCT) achieves a mass activity of 1.85 A mgIr+Ru -1 at 1.48 VRHE , which is 139-fold higher than that of commercial IrO2 . Moreover, the superior electrocatalytic performance of Mn-RuIr NCT in the PEM electrolysis system ensures its viability in practical uses. The results of the excellent catalytic performance for acidic OER indicate that the heterostructuring robust rutile IrO2 and the highly active Ru species with a low oxidation state on the catalyst surface drive a synergistic effect.
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Affiliation(s)
- Jinwhan Joo
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul, 02841, Republic of Korea
| | - YeJi Park
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul, 02841, Republic of Korea
| | - Jun Kim
- Center for Hydrogen & Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Taehyun Kwon
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul, 02841, Republic of Korea
| | - Minki Jun
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul, 02841, Republic of Korea
| | - Docheon Ahn
- Beamline Department, Pohang Accelerator Laboratory, Pohang, 37673, Republic of Korea
| | - Hionsuck Baik
- Korea Basic Science Institute (KBSI), Seoul, 02841, Republic of Korea
| | - Jong Hyun Jang
- Center for Hydrogen & Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Jin Young Kim
- Center for Hydrogen & Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Kwangyeol Lee
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul, 02841, Republic of Korea
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53
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Hayashi K, Kusunoki K, Tomimori T, Sato R, Todoroki N, Wadayama T. Hydrogen Peroxide Generation and Hydrogen Oxidation Reactions of Vacuum-prepared Ru/Ir(111) Bimetallic Surfaces. Phys Chem Chem Phys 2022; 24:14277-14283. [DOI: 10.1039/d2cp01261h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
From the viewpoint of the application of Ir-Ru alloys for anode of proton exchange membrane fuel cells (PEMFCs), hydrogen peroxide (H2O2) generation and the hydrogen oxidation reaction (HOR) properties of...
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54
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Hao S, Sheng H, Liu M, Huang J, Zheng G, Zhang F, Liu X, Su Z, Hu J, Qian Y, Zhou L, He Y, Song B, Lei L, Zhang X, Jin S. Torsion strained iridium oxide for efficient acidic water oxidation in proton exchange membrane electrolyzers. NATURE NANOTECHNOLOGY 2021; 16:1371-1377. [PMID: 34697492 DOI: 10.1038/s41565-021-00986-1] [Citation(s) in RCA: 117] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 08/24/2021] [Indexed: 06/13/2023]
Abstract
Acidic oxygen evolution reaction is crucial for practical proton exchange membrane water splitting electrolysers, which have been hindered by the high catalytic overpotential and high loading of noble metal catalysts. Here we present a torsion-strained Ta0.1Tm0.1Ir0.8O2-δ nanocatalyst with numerous grain boundaries that exhibit a low overpotential of 198 mV at 10 mA cm-2 towards oxygen evolution reaction in 0.5 M H2SO4. Microstructural analyses, X-ray absorption spectroscopy and theoretical calculations reveal that the synergistic effects between grain boundaries that result in torsion-strained Ir-O bonds and the doping induced ligand effect collectively tune the adsorption energy of oxygen intermediates, thus enhancing the catalytic activity. A proton exchange membrane electrolyser using a Ta0.1Tm0.1Ir0.8O2-δ nanocatalyst with a low mass loading of 0.2 mg cm-2 can operate stably at 1.5 A cm-2 for 500 hours with an estimated cost of US$1 per kilogram of H2, which is much lower than the target (US$2 per kg of H2) set by the US Department of Energy.
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Affiliation(s)
- Shaoyun Hao
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Hongyuan Sheng
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Min Liu
- School of Physics and Electronics, Central South University, Changsha, Hunan, China
| | - Jinzhen Huang
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, United States
- Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, China
| | - Guokui Zheng
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Fan Zhang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Xiangnan Liu
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Zhiwei Su
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Jiajun Hu
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Yang Qian
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Lina Zhou
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Yi He
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Bo Song
- Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, China
| | - Lecheng Lei
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China
- Institute of Zhejiang University-Quzhou, Quzhou, China
| | - Xingwang Zhang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China.
- Institute of Zhejiang University-Quzhou, Quzhou, China.
| | - Song Jin
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, United States.
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55
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Saadun AJ, Ruiz–Ferrando A, Büchele S, Faust Akl D, López N, Pérez–Ramírez J. Structure sensitivity of nitrogen–doped carbon–supported metal catalysts in dihalomethane hydrodehalogenation. J Catal 2021. [DOI: 10.1016/j.jcat.2021.10.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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56
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Liu P, Huang X, Mance D, Copéret C. Atomically dispersed iridium on MgO(111) nanosheets catalyses benzene–ethylene coupling towards styrene. Nat Catal 2021. [DOI: 10.1038/s41929-021-00700-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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57
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Li N, Cai L, Wang C, Lin Y, Huang J, Sheng H, Pan H, Zhang W, Ji Q, Duan H, Hu W, Zhang W, Hu F, Tan H, Sun Z, Song B, Jin S, Yan W. Identification of the Active-Layer Structures for Acidic Oxygen Evolution from 9R-BaIrO 3 Electrocatalyst with Enhanced Iridium Mass Activity. J Am Chem Soc 2021; 143:18001-18009. [PMID: 34694127 DOI: 10.1021/jacs.1c04087] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Iridium-based perovskites show promising catalytic activity for oxygen evolution reaction (OER) in acid media, but the iridium mass activity remains low and the active-layer structures have not been identified. Here, we report highly active 1 nm IrOx particles anchored on 9R-BaIrO3 (IrOx/9R-BaIrO3) that are directly synthesized by solution calcination followed by strong acid treatment for the first time. The developed IrOx/9R-BaIrO3 catalyst delivers a high iridium mass activity (168 A gIr-1), about 16 times higher than that of the benchmark acidic OER electrocatalyst IrO2 (10 A gIr-1), and only requires a low overpotential of 230 mV to reach a catalytic current density of 10 mA cm-2geo. Careful scanning transmission electron microscopy, synchrotron radiation-based X-ray absorption spectroscopy, and X-ray photoelectron spectroscopy analyses reveal that, during the electrocatalytic process, the initial 1 nm IrOx nanoparticles/9R-BaIrO3 evolve into amorphous Ir4+OxHy/IrO6 octahedrons and then to amorphous Ir5+Ox/IrO6 octahedrons on the surface. Such high relative content of amorphous Ir5+Ox species derived from trimers of face-sharing IrO6 octahedrons in 9R-BaIrO3 and the enhanced metallic conductivity of the Ir5+Ox/9R-BaIrO3 catalyst are responsible for the excellent acidic OER activity. Our results provide new insights into the surface active-layer structure evolution in perovskite electrocatalysts and demonstrate new approaches for engineering highly active acidic OER nanocatalysts.
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Affiliation(s)
- Na Li
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Liang Cai
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China.,Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Chao Wang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Yue Lin
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Jinzhen Huang
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.,Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, P.R. China
| | - Hongyuan Sheng
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Haibin Pan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Wei Zhang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Qianqian Ji
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Hengli Duan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Wei Hu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Wenhua Zhang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Fengchun Hu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Hao Tan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Zhihu Sun
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
| | - Bo Song
- Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, P.R. China
| | - Song Jin
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Wensheng Yan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
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58
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Dimitrova N, Banti A, Spyridou ON, Papaderakis A, Georgieva J, Sotiropoulos S, Valova E, Armyanov S, Tatchev D, Hubin A, Baert K. Photodeposited IrO2 on TiO2 support as a catalyst for oxygen evolution reaction. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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59
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Xie R, Mao W, Jia H, Sun J, Lu G, Jiang H, Zhang M. Reductive electrophilic C-H alkylation of quinolines by a reusable iridium nanocatalyst. Chem Sci 2021; 12:13802-13808. [PMID: 34760165 PMCID: PMC8549771 DOI: 10.1039/d1sc02967c] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 09/26/2021] [Indexed: 12/11/2022] Open
Abstract
The incorporation of a coupling step into the reduction of unsaturated systems offers a desirable way for diverse synthesis of functional molecules, but it remains to date a challenge due to the difficulty in controlling the chemoselectivity. Herein, by developing a new heterogeneous iridium catalyst composed of Ir-species (Irδ+) and N-doped SiO2/TiO2 support (Ir/N-SiO2/TiO2), we describe its application in reductive electrophilic mono and dialkylations of quinolines with various 2- or 4-functionalized aryl carbonyls or benzyl alcohols by utilizing renewable formic acid as the reductant. This catalytic transformation offers a practical platform for direct access to a vast range of alkyl THQs, proceeding with excellent step and atom-efficiency, good substrate scope and functional group tolerance, a reusable catalyst and abundantly available feedstocks, and generation of water and carbon dioxide as by-products. The work opens a door to further develop more useful organic transformations under heterogeneous reductive catalysis. By developing a heterogeneous iridium catalyst composed of a N-doped SiO2/TiO2 support and Ir-species (Ir/N-SiO2/TiO2), its application in reductive electrophilic alkylation of quinolines with various aryl carbonyls or benzyl alcohols is presented.![]()
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Affiliation(s)
- Rong Xie
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Wenhui Mao
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Huanhuan Jia
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Jialu Sun
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Guangpeng Lu
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Huanfeng Jiang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Min Zhang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
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60
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Lončar A, Escalera-López D, Ruiz-Zepeda F, Hrnjić A, Šala M, Jovanovič P, Bele M, Cherevko S, Hodnik N. Sacrificial Cu Layer Mediated the Formation of an Active and Stable Supported Iridium Oxygen Evolution Reaction Electrocatalyst. ACS Catal 2021; 11:12510-12519. [PMID: 34676130 PMCID: PMC8524421 DOI: 10.1021/acscatal.1c02968] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 09/03/2021] [Indexed: 02/03/2023]
Abstract
![]()
The production of
hydrogen via a proton-exchange membrane water
electrolyzer (PEM-WE) is directly dependent on the rational design
of electrocatalysts for the anodic oxygen evolution reaction (OER),
which is the bottleneck of the process. Here, we present a smart design
strategy for enhancing Ir utilization and stabilization. We showcase
it on a catalyst, where Ir nanoparticles are efficiently anchored
on a conductive support titanium oxynitride (TiONx) dispersed over carbon-based Ketjen Black and covered by
a thin layer of copper (Ir/CuTiONx/C),
which gets removed in the preconditioning step. Electrochemical OER
activity, stability, and structural changes were compared to the Ir-based
catalyst, where Ir nanoparticles without Cu are deposited on the same
support (Ir/TiONx/C). To study the effect
of the sacrificial less-noble metal layer on the catalytic performance
of the synthesized material, characterization methods, namely X-ray
powder diffraction, X-ray photoemission spectroscopy, and identical
location transmission electron microscopy were employed and complemented
with scanning flow cell coupled to an inductively coupled plasma mass
spectrometer, which allowed studying the online dissolution during
the catalytic reaction. Utilization of these advanced methods revealed
that the sacrificial Cu layer positively affects both Ir OER mass
activity and its durability, which was assessed via S-number, a recently
reported stability metric. Improved activity of Cu analogue was ascribed
to the higher surface area of smaller Ir nanoparticles, which are
better stabilized through a strong metal–support interaction
(SMSI) effect.
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Affiliation(s)
- Anja Lončar
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
- University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia
| | - Daniel Escalera-López
- Helmholtz-Institute Erlangen−Nürnberg for Renewable Energy, Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Francisco Ruiz-Zepeda
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Armin Hrnjić
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
- University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia
| | - Martin Šala
- Department of Analytical Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Primož Jovanovič
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Marjan Bele
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Serhiy Cherevko
- Helmholtz-Institute Erlangen−Nürnberg for Renewable Energy, Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Nejc Hodnik
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
- University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia
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61
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Weber T, Vonk V, Escalera-López D, Abbondanza G, Larsson A, Koller V, Abb MJ, Hegedüs Z, Bäcker T, Lienert U, Harlow GS, Stierle A, Cherevko S, Lundgren E, Over H. Operando Stability Studies of Ultrathin Single-Crystalline IrO 2(110) Films under Acidic Oxygen Evolution Reaction Conditions. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03599] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tim Weber
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, Giessen 35392, Germany
- Center for Materials Research, Justus Liebig University, Heinrich-Buff-Ring 16, Giessen 35392, Germany
| | - Vedran Vonk
- Deutsches Elektronensynchrotron (DESY), Notkestr. 85, Hamburg 22607, Germany
| | - Daniel Escalera-López
- Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Egerlandstr. 3, Erlangen 91058, Germany
| | | | - Alfred Larsson
- Synchrotron Radiation Research, Lund University, Lund 22100, Sweden
| | - Volkmar Koller
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, Giessen 35392, Germany
- Center for Materials Research, Justus Liebig University, Heinrich-Buff-Ring 16, Giessen 35392, Germany
| | - Marcel J.S. Abb
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, Giessen 35392, Germany
- Center for Materials Research, Justus Liebig University, Heinrich-Buff-Ring 16, Giessen 35392, Germany
| | - Zoltan Hegedüs
- Deutsches Elektronensynchrotron (DESY), Notkestr. 85, Hamburg 22607, Germany
| | - Thomas Bäcker
- Deutsches Elektronensynchrotron (DESY), Notkestr. 85, Hamburg 22607, Germany
| | - Ulrich Lienert
- Deutsches Elektronensynchrotron (DESY), Notkestr. 85, Hamburg 22607, Germany
| | - Gary S. Harlow
- Department of Chemistry, Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark
| | - Andreas Stierle
- Deutsches Elektronensynchrotron (DESY), Notkestr. 85, Hamburg 22607, Germany
- Fachbereich Physik, University Hamburg, Hamburg 20355, Germany
| | - Serhiy Cherevko
- Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Egerlandstr. 3, Erlangen 91058, Germany
| | - Edvin Lundgren
- Synchrotron Radiation Research, Lund University, Lund 22100, Sweden
| | - Herbert Over
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, Giessen 35392, Germany
- Center for Materials Research, Justus Liebig University, Heinrich-Buff-Ring 16, Giessen 35392, Germany
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62
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Zhao R, Wang Z, Xu Q, Niu X, Han Y, Qin Y, Wang Q. Self-supported amorphous iridium oxide catalysts for highly efficient and durable oxygen evolution reaction in acidic media. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138955] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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63
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Liu M, Ji Y, Li Y, An P, Zhang J, Yan J, Liu SF. Single-Atom Doping and High-Valence State for Synergistic Enhancement of NiO Electrocatalytic Water Oxidation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2102448. [PMID: 34323372 DOI: 10.1002/smll.202102448] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 05/31/2021] [Indexed: 06/13/2023]
Abstract
The NiO-based electrocatalytic oxygen evolution reaction (OER) of water splitting is recognized as a promising approach to produce clean H2 fuel. However, the OER performance is still low, and especially, the overpotential is larger than 200 mV at the current density of 10 mA cm-2 . Herein, an Ir@IrNiO sample is prepared with single-atom (SA) Ir4+ doping and surface metallic Ir nanoparticles loaded onto the NiO. Owing to the bonding of the loaded Ir with surface-exposed Ni2+ , the nearby Ni atoms exist in the +3 valence state, that is, the surface-loaded Ir particles behave like a stabilizer for the Ni3+ sites. Under the synergistic effect of SA Ir4+ and high-valance-state Ni3+ , the Ir@IrNiO nanostructure effectively reduces the overpotential to 195 mV at a current density of 10 mA cm-2 . Moreover, it gives an Ir-content-normalized current density of 0.0457 A mgIr -1 , 72.1 times higher than that of the best commercialized IrO2 (6.33 × 10-4 A mgIr -1 ), under the condition of 1.5 V versus reversible hydrogen electrode. Operando Raman and X-ray absorption fine-structure (XAFS) measurements reveal that there are more surface-active species of Ni3+ , which adsorb and activate water molecules to form Ni3+ -*OH at low voltage, the intermediate of Ni4+ -•O is then formed at a relatively high bias voltage, and then the •O is transferred to the SA Ir4+ sites to generate Ir4+ -O-O with OH at increased voltage. This work can help design more SA-based highly active OER materials.
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Affiliation(s)
- Meng Liu
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Normal University, Xi'an, 710119, P. R. China
- Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
| | - Yujin Ji
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Youyong Li
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Pengfei An
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jing Zhang
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Junqing Yan
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Normal University, Xi'an, 710119, P. R. China
- Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
| | - Shengzhong Frank Liu
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Normal University, Xi'an, 710119, P. R. China
- Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
- iChEM, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian, 116023, P. R. China
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Extracting Turnover Frequencies of Electron Transfer in Heterogeneous Catalysis: A Study of IrO2-TiO2 Anatase for Water Oxidation Using Ce4+ Cations. Catalysts 2021. [DOI: 10.3390/catal11091030] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Within the context of electron transfer during the catalytic water oxidation reaction, the Ir-based system is among the most active. The reaction, mimicking photosynthesis II, requires the use of an electron acceptor such the Ce4+ cation. This complex reaction, involving adsorbed water at the interface of the metal cation and Ce4+, has mostly been studied in homogenous systems. To address the ambiguity regarding the gradual transformation of a homogenous system into a heterogeneous one, we prepared and studied a heterogeneous catalyst system composed of IrO2, with a mean particle size ranging from about 5 Å to 10 Å, dispersed on a TiO2 anatase support, with the objective of probing into the different parameters of the reaction, as well as the compositional changes and rates. The system was stable for many of the runs that were conducted (five consecutive runs with 0.18 M of Ce4+ showed the same reaction rate with TON > 56,000) and, equally importantly, was stable without induction periods. Extraction of the reaction rates from the set of catalysts, with an attempt to normalize them with respect to Ir loading and, therefore, to obtain turnover frequencies (TOF), was conducted. While, within reasonable deviations, the TOF numbers extracted from TPR and XPS Ir4f were close, those extracted from the particle shape (HR-STEM) were considerably larger. The difference indicates that bulk Ir atoms contribute to the electron transfer reaction, which may indicate that the reaction rate is dominated by the reorganization energy between the redox couples involved. Therefore, the normalization of reaction rates with surface atoms may lead to an overestimation of the site activity.
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Escalera-López D, Czioska S, Geppert J, Boubnov A, Röse P, Saraçi E, Krewer U, Grunwaldt JD, Cherevko S. Phase- and Surface Composition-Dependent Electrochemical Stability of Ir-Ru Nanoparticles during Oxygen Evolution Reaction. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01682] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel Escalera-López
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Erlangen, Germany Egerlandstr. 3, 91058 Erlangen, Germany
| | - Steffen Czioska
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
| | - Janis Geppert
- Institute of Applied Materials-Electrochemical Technologies (IAM-ET), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
| | - Alexey Boubnov
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Philipp Röse
- Institute of Applied Materials-Electrochemical Technologies (IAM-ET), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
| | - Erisa Saraçi
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Ulrike Krewer
- Institute of Applied Materials-Electrochemical Technologies (IAM-ET), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
| | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Serhiy Cherevko
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Erlangen, Germany Egerlandstr. 3, 91058 Erlangen, Germany
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66
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Edgington J, Schweitzer N, Alayoglu S, Seitz LC. Constant Change: Exploring Dynamic Oxygen Evolution Reaction Catalysis and Material Transformations in Strontium Zinc Iridate Perovskite in Acid. J Am Chem Soc 2021; 143:9961-9971. [PMID: 34161089 DOI: 10.1021/jacs.1c04332] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
While iridium-based perovskites have been identified as promising candidates for the oxygen evolution reaction (OER) in proton exchange membrane (PEM) electrolyzer applications, an improved fundamental understanding of these highly dynamic materials under reaction conditions is needed to inform more robust future catalyst design. Herein, we study the highly active SrIr0.8Zn0.2O3 perovskite for the OER in acid by employing electrochemical experiments with in situ and ex situ characterization techniques to understand the dynamic nature of this material at both short and long time scales. We observe initial intrinsic OER activity improvement with electrochemical cycling as well as an initial increase of Ir oxidation state under OER conditions via in situ X-ray absorption spectroscopy. We discover that the SrIr0.8Zn0.2O3 perovskite experiences an OER-induced metal to insulator transition (MIT) with extensive electrochemical cycling, caused by surface reorganization and changes to the material crystallinity that occur with exposure to an acidic and oxidizing environment. Our novel identification of an OER-induced MIT for iridate perovskites reveals an additional stability concern for iridate catalysts which are known to experience material dissolution challenges; this work ultimately aims to inform future catalyst material design for PEM water electrolysis applications.
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Affiliation(s)
- Jane Edgington
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Neil Schweitzer
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3113, United States.,Center for Catalysis and Surface Science, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Selim Alayoglu
- Center for Catalysis and Surface Science, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Linsey C Seitz
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3113, United States
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67
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Sreenavya A, Ahammed S, Ramachandran A, Ganesh V, Sakthivel A. Nickel–Ruthenium Bimetallic Species on Hydrotalcite Support: A Potential Hydrogenation Catalyst. Catal Letters 2021. [DOI: 10.1007/s10562-021-03673-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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68
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Hydrous Hydrazine Decomposition for Hydrogen Production Using of Ir/CeO 2: Effect of Reaction Parameters on the Activity. NANOMATERIALS 2021; 11:nano11051340. [PMID: 34069534 PMCID: PMC8161091 DOI: 10.3390/nano11051340] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/12/2021] [Accepted: 05/14/2021] [Indexed: 11/17/2022]
Abstract
In the present work, an Ir/CeO2 catalyst was prepared by the deposition-precipitation method and tested in the decomposition of hydrazine hydrate to hydrogen, which is very important in the development of hydrogen storage materials for fuel cells. The catalyst was characterised using different techniques, i.e., X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM) equipped with X-ray detector (EDX) and inductively coupled plasma-mass spectroscopy (ICP-MS). The effect of reaction conditions on the activity and selectivity of the material was evaluated in this study, modifying parameters such as temperature, the mass of the catalyst, stirring speed and concentration of base in order to find the optimal conditions of reaction, which allow performing the test in a kinetically limited regime.
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69
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Thermal CO Oxidation and Photocatalytic CO 2 Reduction over Bare and M-Al 2O 3 (M = Co, Ni, Cu, Rh, Pd, Ag, Ir, Pt, and Au) Cotton-Like Nanosheets. NANOMATERIALS 2021; 11:nano11051278. [PMID: 34068042 PMCID: PMC8152517 DOI: 10.3390/nano11051278] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/08/2021] [Accepted: 05/09/2021] [Indexed: 11/16/2022]
Abstract
Aluminum oxide (Al2O3) has abundantly been used as a catalyst, and its catalytic activity has been tailored by loading transition metals. Herein, γ-Al2O3 nanosheets were prepared by the solvothermal method, and transition metals (M = Co, Ni, Cu, Rh, Pd, Ag, Ir, Pt, and Au) were loaded onto the nanosheets. Big data sets of thermal CO oxidation and photocatalytic CO2 reduction activities were fully examined for the transition metal-loaded Al2O3 nanosheets. Their physicochemical properties were examined by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction crystallography, and X-ray photoelectron spectroscopy. It was found that Rh, Pd, Ir, and Pt-loading showed a great enhancement in CO oxidation activity while other metals negated the activity of bare Al2O3 nanosheets. Rh-Al2O3 showed the lowest CO oxidation onset temperature of 172 °C, 201 °C lower than that of bare γ-Al2O3. CO2 reduction experiments were also performed to show that CO, CH3OH, and CH4 were common products. Ag-Al2O3 nanosheets showed the highest performances with yields of 237.3 ppm for CO, 36.3 ppm for CH3OH, and 30.9 ppm for CH4, 2.2×, 1.2×, and 1.6× enhancements, respectively, compared with those for bare Al2O3. Hydrogen production was found to be maximized to 20.7 ppm during CO2 reduction for Rh-loaded Al2O3. The present unique pre-screening test results provided very useful information for the selection of transition metals on Al2O3-based energy and environmental catalysts.
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70
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Hao S, Yang J, Liu P, Xu J, Yang C, Li F. Linear-Organic-Polymer-Supported Iridium Complex as a Recyclable Auto-Tandem Catalyst for the Synthesis of Quinazolinones via Selective Hydration/Acceptorless Dehydrogenative Coupling from o-Aminobenzonitriles. Org Lett 2021; 23:2553-2558. [PMID: 33729807 DOI: 10.1021/acs.orglett.1c00475] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A linear-organic-polymer-supported iridium complex Cp*Ir@P4VP, which is designed and synthesized by the coordinative immobilization of [Cp*IrCl2]2 on poly(4-vinylpyridine), was proven to be an efficient heterogeneous autotandem catalyst for synthesizing quinazolinones via selective hydration/acceptorless dehydrogenative coupling from o-aminobenzonitriles. Furthermore, the synthesized catalyst was recycled five times without an obvious decrease in the catalytic activity.
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Affiliation(s)
- Shushu Hao
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, P. R. China
| | - Jiazhi Yang
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, P. R. China
| | - Peng Liu
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, P. R. China
| | - Jing Xu
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, P. R. China
| | - Chenchen Yang
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, P. R. China
| | - Feng Li
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, P. R. China
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71
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Hu J, Xu H, Feng X, Lei L, He Y, Zhang X. Neodymium‐Doped IrO
2
Electrocatalysts Supported on Titanium Plates for Enhanced Chlorine Evolution Reaction Performance. ChemElectroChem 2021. [DOI: 10.1002/celc.202100147] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Jiajun Hu
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University 310027 Hangzhou
- Institute of Zhejiang University-Quzhou 324000 Quzhou
| | - Haoran Xu
- Zhejiang Provincial Key Laboratory of Energy Efficiency and Pollution Control Technology for Thermal Power Generation 311121 Hangzhou
- Zhejiang Energy Group R&D Co., Ltd. 310003 Hangzhou
| | - Xiangdong Feng
- Zhejiang Provincial Key Laboratory of Energy Efficiency and Pollution Control Technology for Thermal Power Generation 311121 Hangzhou
- Zhejiang Energy Group R&D Co., Ltd. 310003 Hangzhou
| | - Lecheng Lei
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University 310027 Hangzhou
- Institute of Zhejiang University-Quzhou 324000 Quzhou
| | - Yi He
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University 310027 Hangzhou
| | - Xingwang Zhang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University 310027 Hangzhou
- Institute of Zhejiang University-Quzhou 324000 Quzhou
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72
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Park S, Shviro M, Hartmann H, Besmehn A, Mayer J, Stolten D, Carmo M. Nickel Structures as a Template Strategy to Create Shaped Iridium Electrocatalysts for Electrochemical Water Splitting. ACS APPLIED MATERIALS & INTERFACES 2021; 13:13576-13585. [PMID: 33706507 DOI: 10.1021/acsami.0c23026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Low-cost, highly active, and highly stable catalysts are desired for the generation of hydrogen and oxygen using water electrolyzers. To enhance the kinetics of the oxygen evolution reaction in an acidic medium, it is of paramount importance to redesign iridium electrocatalysts into novel structures with organized morphology and high surface area. Here, we report on the designing of a well-defined and highly active hollow nanoframe based on iridium. The synthesis strategy was to control the shape of nickel nanostructures on which iridium nanoparticles will grow. After the growth of iridium on the surface, the next step was to etch the nickel core to form the NiIr hollow nanoframe. The etching procedure was found to be significant in controlling the hydroxide species on the iridium surface and by that affecting the performance. The catalytic performance of the NiIr hollow nanoframe was studied for oxygen evolution reaction and shows 29 times increased iridium mass activity compared to commercially available iridium-based catalysts. Our study provides novel insights to control the fabrication of iridium-shaped catalysts using 3d transition metal as a template and via a facile etching step to steer the formation of hydroxide species on the surface. These findings shall aid the community to finally create stable iridium alloys for polymer electrolyte membrane water electrolyzers, and the strategy is also useful for many other electrochemical devices such as batteries, fuel cells, sensors, and solar organic cells.
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Affiliation(s)
- Seongeun Park
- Institute of Energy and Climate Research, Electrochemical Process Engineering (IEK-14), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Meital Shviro
- Institute of Energy and Climate Research, Electrochemical Process Engineering (IEK-14), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Heinrich Hartmann
- Central Institute for Engineering, Electronics and Analytics (ZEA-3), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Astrid Besmehn
- Central Institute for Engineering, Electronics and Analytics (ZEA-3), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Joachim Mayer
- ER-C 2, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
- GFE, RWTH Aachen University, 52074 Aachen, Germany
| | - Detlef Stolten
- Institute of Energy and Climate Research, Techno-economic Systems Analysis (IEK-3), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
- Chair for Fuel Cells, RWTH Aachen University, 52062 Aachen, Germany
| | - Marcelo Carmo
- Institute of Energy and Climate Research, Electrochemical Process Engineering (IEK-14), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
- Mechanical and Materials Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada
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73
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Wang H, Chen ZN, Wu D, Cao M, Sun F, Zhang H, You H, Zhuang W, Cao R. Significantly Enhanced Overall Water Splitting Performance by Partial Oxidation of Ir through Au Modification in Core–Shell Alloy Structure. J Am Chem Soc 2021; 143:4639-4645. [DOI: 10.1021/jacs.0c12740] [Citation(s) in RCA: 71] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Huimin Wang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Zhe-ning Chen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
| | - Dongshuang Wu
- Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Minna Cao
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Fanfei Sun
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Hao Zhang
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Hanhui You
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
| | - Wei Zhuang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
| | - Rong Cao
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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74
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Kot M, Wojcieszak R, Janiszewska E, Pietrowski M, Zieliński M. Effect of Modification of Amorphous Silica with Ammonium Agents on the Physicochemical Properties and Hydrogenation Activity of Ir/SiO 2 Catalysts. MATERIALS 2021; 14:ma14040968. [PMID: 33670803 PMCID: PMC7923007 DOI: 10.3390/ma14040968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 01/29/2021] [Accepted: 02/15/2021] [Indexed: 02/01/2023]
Abstract
The modification of commercial silica with solutions of NH4F or NH4Cl salts, followed by thermal treatment, enabled generation of the acidic sites in SiO2 and changed its textural properties. The use of ammonium salts solution also caused the generation of additional porosity. Using NH4F solution caused significant decrease in the specific surface area and the increase in the average pore diameter. The number and strength of resulting acid sites depend on the nature of anion in the applied ammonium salt and the concentration of salt solution. It has been found that the sample treated with NH4F presented higher total acidity (TPD–NH3) and the amount as well as the strength of acid sites increased with the concentration of the used modifier. As modified amorphous SiO2 materials used as a support for iridium (1 wt %, Ir(acac)3) nanoparticles permitted to obtain highly active catalysts for toluene hydrogenation under atmospheric pressure. The highest activity (expressed as the apparent rate and TOF) was obtained for iridium catalysts supported on silica modified by NH4F with the highest acidity. The modification of silica with NH4F favors the generation of centers able to adsorb toluene, which results in higher activity of this catalyst.
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Affiliation(s)
- Monika Kot
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.K.); (E.J.); (M.P.)
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-59000 Lille, France;
| | - Robert Wojcieszak
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-59000 Lille, France;
| | - Ewa Janiszewska
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.K.); (E.J.); (M.P.)
| | - Mariusz Pietrowski
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.K.); (E.J.); (M.P.)
| | - Michał Zieliński
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.K.); (E.J.); (M.P.)
- Correspondence:
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75
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Spöri C, Falling LJ, Kroschel M, Brand C, Bonakdarpour A, Kühl S, Berger D, Gliech M, Jones TE, Wilkinson DP, Strasser P. Molecular Analysis of the Unusual Stability of an IrNbO x Catalyst for the Electrochemical Water Oxidation to Molecular Oxygen (OER). ACS APPLIED MATERIALS & INTERFACES 2021; 13:3748-3761. [PMID: 33442973 DOI: 10.1021/acsami.0c12609] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Adoption of proton exchange membrane (PEM) water electrolysis technology on a global level will demand a significant reduction of today's iridium loadings in the anode catalyst layers of PEM electrolyzers. However, new catalyst and electrode designs with reduced Ir content have been suffering from limited stability caused by (electro)chemical degradation. This has remained a serious impediment to a wider commercialization of larger-scale PEM electrolysis technology. In this combined DFT computational and experimental study, we investigate a novel family of iridium-niobium mixed metal oxide thin-film catalysts for the oxygen evolution reaction (OER), some of which exhibit greatly enhanced stability, such as minimized voltage degradation and reduced Ir dissolution with respect to the industry benchmark IrOx catalyst. More specifically, we report an unusually durable IrNbOx electrocatalyst with improved catalytic performance compared to an IrOx benchmark catalyst prepared in-house and a commercial benchmark catalyst (Umicore Elyst Ir75 0480) at significantly reduced Ir catalyst cost. Catalyst stability was assessed by conventional and newly developed accelerated degradation tests, and the mechanistic origins were analyzed and are discussed. To achieve this, the IrNbOx mixed metal oxide catalyst and its water splitting kinetics were investigated by a host of techniques such as synchrotron-based NEXAFS analysis and XPS, electrochemistry, and ab initio DFT calculations as well as STEM-EDX cross-sectional analysis. These analyses highlight a number of important structural differences to other recently reported bimetallic OER catalysts in the literature. On the methodological side, we introduce, validate, and utilize a new, nondestructive XRF-based catalyst stability monitoring technique that will benefit future catalyst development. Furthermore, the present study identifies new specific catalysts and experimental strategies for stepwise reducing the Ir demand of PEM water electrolyzers on their long way toward adoption at a larger scale.
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Affiliation(s)
- Camillo Spöri
- Department of Chemistry, The Electrochemical Catalysis, Energy and Materials Science Laboratory, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Lorenz J Falling
- Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Matthias Kroschel
- Department of Chemistry, The Electrochemical Catalysis, Energy and Materials Science Laboratory, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Cornelius Brand
- Department of Chemistry, The Electrochemical Catalysis, Energy and Materials Science Laboratory, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Arman Bonakdarpour
- Department of Chemical and Biological Engineering and the Clean Energy Research Center, University of British Columbia, 2360 East Mall, Vancouver, British Columbia V6T 1Z3, Canada
| | - Stefanie Kühl
- Department of Chemistry, The Electrochemical Catalysis, Energy and Materials Science Laboratory, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
- Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Dirk Berger
- Zentraleinrichtung Elektronenmikroskopie (ZELMI), Technische Universität Berlin, 10623 Berlin, Germany
| | - Manuel Gliech
- Department of Chemistry, The Electrochemical Catalysis, Energy and Materials Science Laboratory, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Travis E Jones
- Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - David P Wilkinson
- Department of Chemical and Biological Engineering and the Clean Energy Research Center, University of British Columbia, 2360 East Mall, Vancouver, British Columbia V6T 1Z3, Canada
| | - Peter Strasser
- Department of Chemistry, The Electrochemical Catalysis, Energy and Materials Science Laboratory, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
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76
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Obradović MD, Balanč BD, Lačnjevac UČ, Gojković SL. Electrochemically deposited iridium-oxide: Estimation of intrinsic activity and stability in oxygen evolution in acid solution. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2020.114944] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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78
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Chatterjee S, Intikhab S, Profitt L, Li Y, Natu V, Gawas R, Snyder J. Nanoporous multimetallic Ir alloys as efficient and stable electrocatalysts for acidic oxygen evolution reactions. J Catal 2021. [DOI: 10.1016/j.jcat.2020.11.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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79
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Polyvinylpyrrolidone-Stabilized Iridium Nanoparticles Catalyzed the Transfer Hydrogenation of Nitrobenzene Using Formic Acid as the Source of Hydrogen. CHEMISTRY 2020. [DOI: 10.3390/chemistry2040061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Catalytic nitrobenzene reduction is crucial for the synthesis of 4,4-methylene diphenyl diisocyanate, which is used to produce polyurethane foams, thermoplastic elastomers, and adhesives. The stability and activity of nanoparticle catalysts are affected by surface ligands and stabilizers. We established the complete composition of 7.0 ± 1.1 nm iridium oxide nanoparticles that were stabilized by polyvinylpyrrolidone (PVP[Ir]). PVP[Ir] and its surface stabilizers were characterized using elemental analysis (EA), high-resolution X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (PXRD), FT-IR, and UV-vis spectroscopy. Notably, PVP[Ir] contained 33.8 ± 0.4% Ir. XPS binding energy analyses suggest that 7% of the Ir is Ir(0) and 93% is IrO2. Using formic acid as the source of hydrogen, PVP[Ir] catalyzed the selective hydrogenation of nitrobenzene to give aniline as the only product in 66% yield in 1 h at 160 °C in a high-pressure metal reactor. Less than 1% of the side products (azobenzene and azoxybenzene) were detected. In contrast, using alcohol as the hydrogen source led to a low yield and a poor selectivity for aniline.
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80
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Ruiz Esquius J, Algara-Siller G, Spanos I, Freakley SJ, Schlögl R, Hutchings GJ. Preparation of Solid Solution and Layered IrOx–Ni(OH)2 Oxygen Evolution Catalysts: Toward Optimizing Iridium Efficiency for OER. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03866] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jonathan Ruiz Esquius
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Gerardo Algara-Siller
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Ioannis Spanos
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mulheim an der Ruhr, Germany
| | - Simon J. Freakley
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 2AY, U.K
| | - Robert Schlögl
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mulheim an der Ruhr, Germany
| | - Graham J. Hutchings
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
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81
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Timmermann J, Kraushofer F, Resch N, Li P, Wang Y, Mao Z, Riva M, Lee Y, Staacke C, Schmid M, Scheurer C, Parkinson GS, Diebold U, Reuter K. IrO_{2} Surface Complexions Identified through Machine Learning and Surface Investigations. PHYSICAL REVIEW LETTERS 2020; 125:206101. [PMID: 33258623 DOI: 10.1103/physrevlett.125.206101] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Accepted: 09/22/2020] [Indexed: 06/12/2023]
Abstract
A Gaussian approximation potential was trained using density-functional theory data to enable a global geometry optimization of low-index rutile IrO_{2} facets through simulated annealing. Ab initio thermodynamics identifies (101) and (111) (1×1) terminations competitive with (110) in reducing environments. Experiments on single crystals find that (101) facets dominate and exhibit the theoretically predicted (1×1) periodicity and x-ray photoelectron spectroscopy core-level shifts. The obtained structures are analogous to the complexions discussed in the context of ceramic battery materials.
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Affiliation(s)
- Jakob Timmermann
- Chair for Theoretical Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstrasse 4, D-85747 Garching, Germany
| | - Florian Kraushofer
- Institute of Applied Physics, Technical University of Vienna, Wiedner Hauptstrasse 8-10/134, A-1040 Vienna, Austria
| | - Nikolaus Resch
- Institute of Applied Physics, Technical University of Vienna, Wiedner Hauptstrasse 8-10/134, A-1040 Vienna, Austria
| | - Peigang Li
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
| | - Yu Wang
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Zhiqiang Mao
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Michele Riva
- Institute of Applied Physics, Technical University of Vienna, Wiedner Hauptstrasse 8-10/134, A-1040 Vienna, Austria
| | - Yonghyuk Lee
- Chair for Theoretical Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstrasse 4, D-85747 Garching, Germany
| | - Carsten Staacke
- Chair for Theoretical Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstrasse 4, D-85747 Garching, Germany
| | - Michael Schmid
- Institute of Applied Physics, Technical University of Vienna, Wiedner Hauptstrasse 8-10/134, A-1040 Vienna, Austria
| | - Christoph Scheurer
- Chair for Theoretical Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstrasse 4, D-85747 Garching, Germany
| | - Gareth S Parkinson
- Institute of Applied Physics, Technical University of Vienna, Wiedner Hauptstrasse 8-10/134, A-1040 Vienna, Austria
| | - Ulrike Diebold
- Institute of Applied Physics, Technical University of Vienna, Wiedner Hauptstrasse 8-10/134, A-1040 Vienna, Austria
| | - Karsten Reuter
- Chair for Theoretical Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstrasse 4, D-85747 Garching, Germany
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
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82
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Weber T, Vonk V, Abb MJS, Evertsson J, Sandroni M, Drnec J, Stierle A, Lundgren E, Over H. Extraordinary Stability of IrO 2(110) Ultrathin Films Supported on TiO 2(110) under Cathodic Polarization. J Phys Chem Lett 2020; 11:9057-9062. [PMID: 33045835 DOI: 10.1021/acs.jpclett.0c02730] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Down to a cathodic potentials of -1.20 V versus the reversible hydrogen electrode, the structure of IrO2(110) electrodes supported by TiO2(110) is found to be stable by in situ synchrotron-based X-ray diffraction. Such high cathodic potentials should lead to reduction to metallic Ir (Pourbaix diagram). From the IrO2 lattice parameters, determined during cathodic polarization in a H2SO4 electrolyte solution (pH 0.4), it is estimated that the unit cell volume increases by 1% due likely to proton incorporation, which is supported by the lack of significant swelling of the IrO2(110) film derived from X-ray reflectivity experiments. Ex situ X-ray photoelectron spectroscopy suggests that protons are incorporated into the IrO2(110) lattice below -1.0 V, although Ir remains exclusively in the IV+ oxidation state down to -1.20 V. Obviously, further hydrogenation of the lattice oxygen of IrO2(110) toward water is suppressed for kinetic reasons and hints at a rate-determining chemical step that cannot be controlled by the electrode potential.
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Affiliation(s)
- Tim Weber
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Center for Materials Research, Justus Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
| | - Vedran Vonk
- Deutsches Elektronen-Synchrotron (DESY), D-22607 Hamburg, Germany
| | - Marcel J S Abb
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Center for Materials Research, Justus Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
| | - Jonas Evertsson
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Deutsches Elektronen-Synchrotron (DESY), D-22607 Hamburg, Germany
| | - Martina Sandroni
- Experimental Division, European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Jakub Drnec
- Experimental Division, European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Andreas Stierle
- Deutsches Elektronen-Synchrotron (DESY), D-22607 Hamburg, Germany
- Fachbereich Physik University Hamburg, Jungiusstrasse 9, D-20355 Hamburg, Germany
| | - Edvin Lundgren
- Synchrotron Radiation Research, Lund University, Box 118, S-22100 Lund, Sweden
| | - Herbert Over
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Center for Materials Research, Justus Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
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83
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Regmi YN, Tzanetopoulos E, Zeng G, Peng X, Kushner DI, Kistler TA, King LA, Danilovic N. Supported Oxygen Evolution Catalysts by Design: Toward Lower Precious Metal Loading and Improved Conductivity in Proton Exchange Membrane Water Electrolyzers. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03098] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Yagya N. Regmi
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Department of Chemistry, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, United Kingdom
| | - Eden Tzanetopoulos
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- College of Chemistry, University of California Berkeley, Berkeley, California 94720, United States
| | - Guosong Zeng
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Xiong Peng
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Douglas I. Kushner
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Tobias A. Kistler
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Walter Schottky Institute and Physics Department, Technische Universität München, 85748 Garching, Germany
| | - Laurie A. King
- Department of Chemistry, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, United Kingdom
| | - Nemanja Danilovic
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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84
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Weber T, Abb MJS, Evertsson J, Sandroni M, Drnec J, Vonk V, Stierle A, Lundgren E, Over H. In situ studies of the cathodic stability of single-crystalline IrO 2(110) ultrathin films supported on RuO 2(110)/Ru(0001) in an acidic environment. Phys Chem Chem Phys 2020; 22:22956-22962. [PMID: 33026372 DOI: 10.1039/d0cp03811c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We investigate with in situ surface X-ray diffraction (SXRD) and X-ray reflectivity (XRR) experiments the cathodic stability of an ultrathin single-crystalline IrO2(110) film with a regular array of mesoscopic rooflike structures that is supported on a RuO2(110)/Ru(0001) template. It turns out that the planarity of the single-crystalline IrO2(110) film is lost in that IrO2(110) oxide domains delaminate at a cathodic potential of -0.18 V. Obviously, the electrolyte solution is able to reach the RuO2(110) layer presumably through the surface grain boundaries of the IrO2(110) layer. Subsequently, the single-crystalline RuO2(110) structure-directing template is reduced to amorphous hydrous RuO2, with the consequence that the IrO2(110) film loses partly its adhesion to the template. From in situ XRR experiments we find that the IrO2(110) film does not swell upon cathodic polarization down to -0.18 V, while from in situ SXRD experiments, the lattice constants of IrO2(110) are shown to be not affected. The rooflike mesostructure of the IrO2(110) flakes remains intact after cathodic polarization to -0.18 V, evidencing that the crystallinity of IrO2(110) is retained.
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Affiliation(s)
- Tim Weber
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany.
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85
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Hsieh TL, Hung PS, Wang CJ, Tso KC, Wang HY, Cheng CT, Lin YC, Chung RJ, Wei KH, Wu PW, Chen PC. Synthesis of IrO 2 decorated core-shell PS@PPyNH 2 microspheres for bio-interface application. NANOTECHNOLOGY 2020; 31:375605. [PMID: 32454465 DOI: 10.1088/1361-6528/ab9678] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this paper, an effective approach is demonstrated for the fabrication of IrO2-decorated polystyrene@functionalized polypyrrole (core@shell; PS@PPyNH2) microspheres. The synthesis begins with the preparation of monodispersive PS microspheres with a diameter of 490 nm, by a process of emulsifier-free emulsion polymerization, followed by a copolymerization process involving pyrrole and PyNH2 monomers in a PS microsphere aqueous suspension, to produce uniform PS@PPyNH2 microspheres with a diameter of 536 nm. The loading of 2 nm IrO2 nanoparticles onto the PS@PPyNH2 microspheres can be easily adjusted by tuning the pH value of the IrO2 colloidal solution and the PS@PPyNH2 suspension. At pH 4, we successfully obtain IrO2-decorated PS@PPyNH2 microspheres via electrostatic attraction and hydrogen bonding simultaneously between the negatively-charged IrO2 nanoparticles and the positively-charged PS@PPyNH2 microspheres. These IrO2-decorated PS@PPyNH2 microspheres exhibit a characteristic cyclic voltammetric profile, similar to that of an IrO2 thin film. The charge storage capacity is 5.19 mA cm-2, a value almost five times greater than that of PS@PPyNH2 microspheres. In addition, these IrO2-decorated PS@PPyNH2 microspheres exhibit excellent cell viability and biocompatibility.
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Affiliation(s)
- Tsung-Lin Hsieh
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, Republic of China
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86
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Martin R, Kim M, Lee CJ, Mehar V, Albertin S, Hejral U, Merte LR, Lundgren E, Asthagiri A, Weaver JF. High-Resolution X-ray Photoelectron Spectroscopy of an IrO 2(110) Film on Ir(100). J Phys Chem Lett 2020; 11:7184-7189. [PMID: 32787312 DOI: 10.1021/acs.jpclett.0c01805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
High-resolution X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) were used to characterize IrO2(110) films on Ir(100) with stoichiometric as well as OH-rich terminations. Core-level Ir 4f and O 1s peaks were identified for the undercoordinated Ir and O atoms and bridging and on-top OH groups at the IrO2(110) surfaces. Peak assignments were validated by comparison of the core-level shifts determined experimentally with those computed using DFT, quantitative analysis of the concentrations of surface species, and the measured variation of the Ir 4f peak intensities with photoelectron kinetic energy. We show that exposure of the IrO2(110) surface to O2 near room temperature produces a large quantity of on-top OH groups because of reaction of background H2 with the surface. The peak assignments made in this study can serve as a foundation for future experiments designed to utilize XPS to uncover atomic-level details of the surface chemistry of IrO2(110).
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Affiliation(s)
- R Martin
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - M Kim
- William G. Lowrie Chemical & Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, United States
| | - C J Lee
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - V Mehar
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - S Albertin
- Division of Synchrotron Radiation Research, Lund University, SE-22100 Lund, Sweden
| | - U Hejral
- Division of Synchrotron Radiation Research, Lund University, SE-22100 Lund, Sweden
| | - L R Merte
- Materials Science and Applied Mathematics, Malmö University, SE-205 06 Malmö, Sweden
| | - E Lundgren
- Division of Synchrotron Radiation Research, Lund University, SE-22100 Lund, Sweden
| | - A Asthagiri
- William G. Lowrie Chemical & Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, United States
| | - J F Weaver
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
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87
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Scheuerlein MC, Muench F, Kunz U, Hellmann T, Hofmann JP, Ensinger W. Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol. ChemElectroChem 2020. [DOI: 10.1002/celc.202000811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Martin Christoph Scheuerlein
- Technical University of DarmstadtDepartment of Materials and Earth Sciences Alarich-Weiss-Strasse 2 64287 Darmstadt Germany
| | - Falk Muench
- Technical University of DarmstadtDepartment of Materials and Earth Sciences Alarich-Weiss-Strasse 2 64287 Darmstadt Germany
| | - Ulrike Kunz
- Technical University of DarmstadtDepartment of Materials and Earth Sciences Alarich-Weiss-Strasse 2 64287 Darmstadt Germany
| | - Tim Hellmann
- Technical University of DarmstadtSurface Science LaboratoryDepartment of Materials and Earth Sciences Otto-Berndt-Strasse 3 64287 Darmstadt Germany
| | - Jan P. Hofmann
- Technical University of DarmstadtSurface Science LaboratoryDepartment of Materials and Earth Sciences Otto-Berndt-Strasse 3 64287 Darmstadt Germany
| | - Wolfgang Ensinger
- Technical University of DarmstadtDepartment of Materials and Earth Sciences Alarich-Weiss-Strasse 2 64287 Darmstadt Germany
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88
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Calì E, Kerherve G, Naufal F, Kousi K, Neagu D, Papaioannou EI, Thomas MP, Guiton BS, Metcalfe IS, Irvine JTS, Payne DJ. Exsolution of Catalytically Active Iridium Nanoparticles from Strontium Titanate. ACS APPLIED MATERIALS & INTERFACES 2020; 12:37444-37453. [PMID: 32698571 DOI: 10.1021/acsami.0c08928] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The search for new functional materials that combine high stability and efficiency with reasonable cost and ease of synthesis is critical for their use in renewable energy applications. Specifically in catalysis, nanoparticles, with their high surface-to-volume ratio, can overcome the cost implications associated with otherwise having to use large amounts of noble metals. However, commercialized materials, that is, catalytic nanoparticles deposited on oxide supports, often suffer from loss of activity because of coarsening and carbon deposition during operation. Exsolution has proven to be an interesting strategy to overcome such issues. Here, the controlled emergence, or exsolution, of faceted iridium nanoparticles from a doped SrTiO3 perovskite is reported and their growth preliminary probed by in situ electron microscopy. Upon reduction of SrIr0.005Ti0.995O3, the generated nanoparticles show embedding into the oxide support, therefore preventing agglomeration and subsequent catalyst degradation. The advantages of this approach are the extremely low noble metal amount employed (∼0.5% weight) and the catalytic activity reported during CO oxidation tests, where the performance of the exsolved SrIr0.005Ti0.995O3 is compared to the activity of a commercial catalyst with 1% loading (1% Ir/Al2O3). The high activity obtained with such low doping shows the possibility of scaling up this new catalyst, reducing the high cost associated with iridium-based materials.
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Affiliation(s)
- Eleonora Calì
- Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, U.K
| | - Gwilherm Kerherve
- Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, U.K
| | - Faris Naufal
- Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, U.K
| | - Kalliopi Kousi
- School of Engineering, Newcastle University, Merz Court, Newcastle upon Tyne NE1 7RU, U.K
| | - Dragos Neagu
- School of Engineering, Newcastle University, Merz Court, Newcastle upon Tyne NE1 7RU, U.K
| | | | - Melonie P Thomas
- Department of Chemistry, University of Kentucky, 505 Rose Street, Lexington, Kentucky 40506, United States
| | - Beth S Guiton
- Department of Chemistry, University of Kentucky, 505 Rose Street, Lexington, Kentucky 40506, United States
| | - Ian S Metcalfe
- School of Engineering, Newcastle University, Merz Court, Newcastle upon Tyne NE1 7RU, U.K
| | - John T S Irvine
- School of Chemistry, University of St Andrews, St. Andrews KY16 9ST, U.K
| | - David J Payne
- Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, U.K
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89
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Ko JS, Johnson JK, Johnson PI, Xia Z. Decoupling Oxygen and Chlorine Evolution Reactions in Seawater using Iridium‐based Electrocatalysts. ChemCatChem 2020. [DOI: 10.1002/cctc.202000653] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jesse S. Ko
- Research and Exploratory Development Department Johns Hopkins University Applied Physics Laboratory Laurel MD 20723 USA
| | - James K. Johnson
- Research and Exploratory Development Department Johns Hopkins University Applied Physics Laboratory Laurel MD 20723 USA
| | - Phillip I. Johnson
- Research and Exploratory Development Department Johns Hopkins University Applied Physics Laboratory Laurel MD 20723 USA
| | - Zhiyong Xia
- Research and Exploratory Development Department Johns Hopkins University Applied Physics Laboratory Laurel MD 20723 USA
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90
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Sun W, Tian X, Liao J, Deng H, Ma C, Ge C, Yang J, Huang W. Assembly of a Highly Active Iridium-Based Oxide Oxygen Evolution Reaction Catalyst by Using Metal-Organic Framework Self-Dissolution. ACS APPLIED MATERIALS & INTERFACES 2020; 12:29414-29423. [PMID: 32496754 DOI: 10.1021/acsami.0c08358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The proton exchange membrane (PEM) electrolyzer for hydrogen production has multiple advantages but is greatly restricted by expensive iridium and sluggish oxygen evolution reaction (OER) kinetics. The most promising way to reduce the precious metal loading is to design and develop highly active Ir-based catalysts. In this study, a versatile approach is reported to prepare a hybrid in the form of a catalyst-support structure (Fe-IrOx@α-Fe2O3, abbreviated Ir@Fe-MF) by utilizing the self-dissolving properties of Fe-MIL-101 under aqueous conditions. The formation of this hybrid is mainly due to the Ir4+ and released Fe3+ ions coprecipitated to assemble into Fe-IrOx nanoparticles, and the Fe3+ released from the inward collapse of the metal-organic framework (MOF) spontaneously forms α-Fe2O3. The prepared Ir@Fe-MF-2 hybrid exhibits enhanced catalytic activity toward OER with a lower onset potential and Tafel slop, and only 260 mV overpotential is required to drive the current density to reach 10 mA cm-2. The performed characterizations clearly indicate that the IrO6 coordination structure is changed significantly by Fe incorporated into the IrO2 lattice. The performed X-ray adsorption spectra (XAS) provides evidence that Ir 5d orbital degeneracy is eliminated because of multiple orbitals being semi-occupied in the presence of Fe, which is mainly responsible for the enhancement of OER activity. These findings open an opportunity for the design and preparation of more efficient OER catalysts of transition metal oxides by utilization of the MOF materials. It should be highlighted that a long-term stability of this catalyst run at a high current density in acidic conditions still faces great challenges.
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Affiliation(s)
- Wei Sun
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, College of Ecology and Environment, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, P.R. China
| | - Xinlong Tian
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, P.R. China
| | - Jianjun Liao
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, College of Ecology and Environment, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, P.R. China
| | - Hui Deng
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, College of Ecology and Environment, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, P.R. China
| | - Chenglong Ma
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Processes, School of Resources and Environmental Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P.R. China
| | - Chengjun Ge
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, College of Ecology and Environment, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, P.R. China
| | - Ji Yang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Processes, School of Resources and Environmental Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P.R. China
| | - Weiwei Huang
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, College of Ecology and Environment, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, P.R. China
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91
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de Freitas IC, Parreira LS, Barbosa ECM, Novaes BA, Mou T, Alves TV, Quiroz J, Wang YC, Slater TJ, Thomas A, Wang B, Haigh SJ, Camargo PHC. Design-controlled synthesis of IrO 2 sub-monolayers on Au nanoflowers: marrying plasmonic and electrocatalytic properties. NANOSCALE 2020; 12:12281-12291. [PMID: 32319490 DOI: 10.1039/d0nr01875a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We develop herein plasmonic-catalytic Au-IrO2 nanostructures with a morphology optimized for efficient light harvesting and catalytic surface area; the nanoparticles have a nanoflower morphology, with closely spaced Au branches all partially covered by an ultrathin (1 nm) IrO2 shell. This nanoparticle architecture optimizes optical features due to the interactions of closely spaced plasmonic branches forming electromagnetic hot spots, and the ultra-thin IrO2 layer maximizes efficient use of this expensive catalyst. This concept was evaluated towards the enhancement of the electrocatalytic performances towards the oxygen evolution reaction (OER) as a model transformation. The OER can play a central role in meeting future energy demands but the performance of conventional electrocatalysts in this reaction is limited by the sluggish OER kinetics. We demonstrate an improvement of the OER performance for one of the most active OER catalysts, IrO2, by harvesting plasmonic effects from visible light illumination in multimetallic nanoparticles. We find that the OER activity for the Au-IrO2 nanoflowers can be improved under LSPR excitation, matching best properties reported in the literature. Our simulations and electrocatalytic data demonstrate that the enhancement in OER activities can be attributed to an electronic interaction between Au and IrO2 and to the activation of Ir-O bonds by LSPR excited hot holes, leading to a change in the reaction mechanism (rate-determinant step) under visible light illumination.
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Affiliation(s)
- Isabel C de Freitas
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Avenida Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
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92
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Gao J, Huang X, Cai W, Wang Q, Jia C, Liu B. Rational Design of an Iridium-Tungsten Composite with an Iridium-Rich Surface for Acidic Water Oxidation. ACS APPLIED MATERIALS & INTERFACES 2020; 12:25991-26001. [PMID: 32428393 DOI: 10.1021/acsami.0c05906] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Developing highly active and stable water oxidation catalysts with reduced cost in acidic media plays a critical role in clean energy technologies such as fuel cells and electrolyzers. Precious iridium-based oxides are still the only oxygen evolution reaction (OER) catalysts with reasonable activity and stability in acid. Herein, we design iridium-tungsten composites with a metallic tungsten-rich core and an iridium-rich surface by the sol-gel method followed by hydrogen reduction. The thus obtained iridium-tungsten catalyst shows much higher intrinsic water oxidation activity (100 mA/mgIr at an overpotential of 290 mV) and stability (100 h at 10 mA/cm2geom) together with reduced iridium content (33 wt % only) as compared with pure iridium oxide. An operando method using H2O2 as a probe molecule is developed to determine the relative adsorption strength of the reaction intermediates (*OH and *OOH) in the OER process. Detailed characterization shows that the tungsten-incorporated surface not only modulates the adsorption energy of oxygen intermediates on iridium but also enhances the stability of iridium species in acid, while the metallic tungsten core exhibits high electrical conductivity, all of which collectively give rise to the much enhanced catalytic performance of iridium-tungsten composite in acidic water oxidation. A single-membrane electrode assembly is further prepared to demonstrate the advantages and potential application of iridium-tungsten composite in practical proton exchange membrane electrolyzers.
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Affiliation(s)
- Jiajian Gao
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
| | - Xiang Huang
- Department of Physics, Southern University of Science and Technology, No. 1088 Xueyuan Avenue, Nanshan District, Shenzhen 518055, China
| | - Weizheng Cai
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
| | - Qilun Wang
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
| | - Chunmiao Jia
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
| | - Bin Liu
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
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93
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Guan H, Ke Q, Lv C, Zeng N, Hu C, Wang S, Ge X, Cai J. Amorphous Iridium Oxide Nanoparticle Films Prepared by Low-temperature Annealing and Plasma Treatment as Highly Efficient Oxygen Evolution Electrocatalysts. CHEM LETT 2020. [DOI: 10.1246/cl.200133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Hongtai Guan
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, Sichuan, P. R. China
- Institute of Materials, China Academy of Engineering Physics, Jiangyou 621908, Sichuan, P. R. China
| | - Qiang Ke
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, Sichuan, P. R. China
| | - Chao Lv
- Institute of Materials, China Academy of Engineering Physics, Jiangyou 621908, Sichuan, P. R. China
| | - Ning Zeng
- Institute of Materials, China Academy of Engineering Physics, Jiangyou 621908, Sichuan, P. R. China
| | - Cun Hu
- Institute of Materials, China Academy of Engineering Physics, Jiangyou 621908, Sichuan, P. R. China
| | - Shuang Wang
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, Sichuan, P. R. China
| | - Xingbo Ge
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, Sichuan, P. R. China
| | - Jinguang Cai
- Institute of Materials, China Academy of Engineering Physics, Jiangyou 621908, Sichuan, P. R. China
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94
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Novotny Z, Tobler B, Artiglia L, Fischer M, Schreck M, Raabe J, Osterwalder J. Kinetics of the Thermal Oxidation of Ir(100) toward IrO 2 Studied by Ambient-Pressure X-ray Photoelectron Spectroscopy. J Phys Chem Lett 2020; 11:3601-3607. [PMID: 32302143 DOI: 10.1021/acs.jpclett.0c00914] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Using time-lapsed ambient-pressure X-ray photoelectron spectroscopy, we investigate the thermal oxidation of single-crystalline Ir(100) films toward rutile IrO2(110) in situ. We initially observe the formation of a carbon-free surface covered with a complete monolayer of oxygen, based on the binding energies of the Ir 4f and O 1s core level peaks. During a rather long induction period with nearly constant oxygen coverage, the work function of the surface changes continuously as sensed by the gas phase O 1s signal. The sudden and rapid formation of the IrO2 rutile phase with a thickness above 3 nm, manifested by distinct binding energy changes and substantiated by quantitative XPS analysis, provides direct evidence that the oxide film is formed via an autocatalytic growth mechanism that was previously proposed for PbO and RuO2.
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Affiliation(s)
- Zbynek Novotny
- Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland
| | - Benjamin Tobler
- Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland
| | - Luca Artiglia
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland
| | - Martin Fischer
- Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany
| | - Matthias Schreck
- Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany
| | - Jörg Raabe
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland
| | - Jürg Osterwalder
- Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland
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95
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Saadun AJ, Pablo-García S, Paunović V, Li Q, Sabadell-Rendón A, Kleemann K, Krumeich F, López N, Pérez-Ramírez J. Performance of Metal-Catalyzed Hydrodebromination of Dibromomethane Analyzed by Descriptors Derived from Statistical Learning. ACS Catal 2020. [DOI: 10.1021/acscatal.0c00679] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- A. J. Saadun
- Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - S. Pablo-García
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - V. Paunović
- Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Q. Li
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - A. Sabadell-Rendón
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - K. Kleemann
- Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - F. Krumeich
- Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - N. López
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - J. Pérez-Ramírez
- Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
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96
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Li P, Wang Y, Wang Y, Jin G, Guo X, Tong X. Silicon Carbide Supported Palladium‐Iridium Bimetallic Catalysts for Efficient Selective Hydrogenation of Cinnamaldehyde. CHINESE J CHEM 2020. [DOI: 10.1002/cjoc.201900299] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Penghui Li
- State Key Laboratory of Coal ConversionInstitute of Coal Chemistry, Chinese Academy of Sciences Taiyuan Shanxi 030001 China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences Beijing 100049 China
| | - Yingyong Wang
- State Key Laboratory of Coal ConversionInstitute of Coal Chemistry, Chinese Academy of Sciences Taiyuan Shanxi 030001 China
| | - Yunwei Wang
- State Key Laboratory of Coal ConversionInstitute of Coal Chemistry, Chinese Academy of Sciences Taiyuan Shanxi 030001 China
| | - Guoqiang Jin
- State Key Laboratory of Coal ConversionInstitute of Coal Chemistry, Chinese Academy of Sciences Taiyuan Shanxi 030001 China
| | - Xiang‐Yun Guo
- State Key Laboratory of Coal ConversionInstitute of Coal Chemistry, Chinese Academy of Sciences Taiyuan Shanxi 030001 China
- School of Petrochemical EngineeringChangzhou University Changzhou Jiangsu 213164 China
| | - Xili Tong
- State Key Laboratory of Coal ConversionInstitute of Coal Chemistry, Chinese Academy of Sciences Taiyuan Shanxi 030001 China
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97
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Syed ZH, Chen Z, Idrees KB, Goetjen TA, Wegener EC, Zhang X, Chapman KW, Kaphan DM, Delferro M, Farha OK. Mechanistic Insights into C–H Borylation of Arenes with Organoiridium Catalysts Embedded in a Microporous Metal–Organic Framework. Organometallics 2020. [DOI: 10.1021/acs.organomet.9b00874] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zoha H. Syed
- Department of Chemistry and International Institute of Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Zhihengyu Chen
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11764, United States
| | - Karam B. Idrees
- Department of Chemistry and International Institute of Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
| | - Timothy A. Goetjen
- Department of Chemistry and International Institute of Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
| | - Evan C. Wegener
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Xuan Zhang
- Department of Chemistry and International Institute of Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
| | - Karena W. Chapman
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11764, United States
| | - David M. Kaphan
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Massimiliano Delferro
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Omar K. Farha
- Department of Chemistry and International Institute of Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
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98
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Martin R, Kim M, Lee CJ, Shariff MS, Feng F, Meyer RJ, Asthagiri A, Weaver JF. Molecular chemisorption of N 2 on IrO 2(110). J Chem Phys 2020; 152:074712. [PMID: 32087661 DOI: 10.1063/1.5142210] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We investigated adsorption of N2 on stoichiometric and O-rich IrO2(110) surfaces using temperature programmed desorption (TPD) experiments and density functional theory (DFT) calculations. TPD shows that N2 desorbs predominantly from the stoichiometric-IrO2(110) surface in a well-defined peak at 270 K for N2 coverages below about 0.5 ML and that a shoulder centered near 235 K develops in the N2 TPD traces as the coverage approaches saturation, indicating that adsorbed N2 molecules destabilize at high N2 coverages. Experiments of N2 adsorption onto O-rich IrO2(110) surfaces provide evidence that N2 adsorbs exclusively on the coordinatively unsaturated Ir atoms (Ircus) of the surface and that pre-adsorbed O-atoms ("on-top" oxygen) stabilize adsorbed N2 molecules, causing the main N2 TPD peak to shift toward higher temperature with increasing oxygen coverages. Consistent with prior results, our DFT calculations predict that an N2 molecule preferentially adsorbs into an upright configuration on an Ircus atom of the IrO2(110) surface and achieves a binding energy of about 100 kJ/mol. The computed binding energy agrees well with our experimental estimate of ∼90 kJ/mol for low N2 coverages on stoichiometric IrO2(110). The DFT calculations also quantitatively reproduce the observed stabilization of N2 by co-adsorption on-top O-atoms and predict the destabilization of N2 on IrO2(110) as the N2 adlayer becomes crowded at high coverages.
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Affiliation(s)
- R Martin
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, USA
| | - M Kim
- William G. Lowrie Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - C J Lee
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, USA
| | - M S Shariff
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, USA
| | - F Feng
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, USA
| | - R J Meyer
- ExxonMobil Research and Engineering, Annandale, New Jersey 08801, USA
| | - A Asthagiri
- William G. Lowrie Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - J F Weaver
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, USA
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99
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Novotny Z, Aegerter D, Comini N, Tobler B, Artiglia L, Maier U, Moehl T, Fabbri E, Huthwelker T, Schmidt TJ, Ammann M, van Bokhoven JA, Raabe J, Osterwalder J. Probing the solid-liquid interface with tender x rays: A new ambient-pressure x-ray photoelectron spectroscopy endstation at the Swiss Light Source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:023103. [PMID: 32113422 DOI: 10.1063/1.5128600] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 01/22/2020] [Indexed: 06/10/2023]
Abstract
A new endstation to perform operando chemical analysis at solid-liquid interfaces by means of ambient pressure x-ray photoelectron spectroscopy (APXPS) is presented. The endstation is located at the Swiss Light Source and can be attached to the soft x-ray in situ spectroscopy beamline (X07DB) for solid-gas type experiments and to a tender x-ray beamline (PHOENIX I) for solid-liquid interface experiments. The setup consists of three interconnected ultrahigh vacuum chambers: one for sample preparation using surface science techniques, the analysis chamber for APXPS experiments, and an entry-lock chamber for sample transfer across the two pressure regimes. The APXPS chamber is designed to study solid-liquid interfaces stabilized by the dip and pull method. Using a three-electrode setup, the potential difference across the solid-electrolyte interface can be controlled, as is demonstrated here using an Ir(001) electrode dipped and pulled from a 0.1M KOH electrolyte. The new endstation is successfully commissioned and will offer unique opportunities for fundamental studies of phenomena that take place at solid-liquid interfaces and that are relevant for fields such as electrochemistry, photochemistry, or biochemistry, to name a few.
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Affiliation(s)
- Zbynek Novotny
- Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland
| | - Dino Aegerter
- Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland
| | - Nicolò Comini
- Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland
| | - Benjamin Tobler
- Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland
| | - Luca Artiglia
- Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland
| | - Urs Maier
- Ferrovac GmbH, Thurgauerstrasse 72, 8050 Zürich, Switzerland
| | - Thomas Moehl
- Department of Chemistry, Universität Zürich, CH-8057 Zürich, Switzerland
| | | | | | | | - Markus Ammann
- Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland
| | | | - Jörg Raabe
- Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland
| | - Jürg Osterwalder
- Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland
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100
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Lu X, Francis S, Motta D, Dimitratos N, Roldan A. Mechanistic study of hydrazine decomposition on Ir(111). Phys Chem Chem Phys 2020; 22:3883-3896. [PMID: 32040127 DOI: 10.1039/c9cp06525c] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrogen transport and storage technology remain one of the critical challenges of the hydrogen economy. Hydrazine (N2H4) is a carbon-free hydrogen carrier which has been widely used as fuel in the field of space exploration. We have combined experiments and computer simulations in order to gain a better understanding of the N2H4 decomposition on Ir catalyst, the most efficient catalyst for hydrazine decomposition up to date. We have identified metallic Ir rather than IrO2 as the active phase for hydrazine decomposition and carried out density functional theory (DFT) calculations to systematically investigate the changes in the electronic structure along with the catalytic decomposition mechanisms. Three catalytic mechanisms to hydrazine decomposition over Ir(111) have been found: (i) intramolecular reaction between hydrazine molecules, (ii) intramolecular reaction between co-adsorbed amino groups, and (iii) hydrazine dehydrogenation assisted by co-adsorbed amino groups. These mechanisms follow five different pathways for which transition states and intermediates have been identified. The results show that hydrazine decomposition on Ir(111) starts preferentially with an initial N-N bond scission followed by hydrazine dehydrogenation assisted by the amino group produced, eventually leading to ammonia and nitrogen production. The preference for N-N scission mechanisms was rationalized by analyzing the electronic structure. This analysis showed that upon hydrazine adsorption, the π bond between nitrogen atoms becomes weaker.
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Affiliation(s)
- Xiuyuan Lu
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - Samantha Francis
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - Davide Motta
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - Nikolaos Dimitratos
- Department of Industrial Chemistry "Toso Montanari", Alma Mater Studiorum-University of Bologna, Viale Risorgimento 4, 40136, Bologna, Italy
| | - Alberto Roldan
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
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