1
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Laws K, Buckingham MA, Aldous L. Self-assembled monolayers for electrostatic electrocatalysis and enhanced electrode stability in thermogalvanic cells. Chem Sci 2024; 15:6958-6964. [PMID: 38725507 PMCID: PMC11077577 DOI: 10.1039/d3sc06766a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Accepted: 04/02/2024] [Indexed: 05/12/2024] Open
Abstract
Waste heat is ubiquitous; as such, sustainable and long-lasting devices are required to convert it into more useful forms of energy that can make use of this abundant potential resource. Thermogalvanic cells (or thermocells) can use the thermoelectrochemical properties of redox couples to achieve this; entropy-driven redox reactions allow them to act as liquid thermoelectrics. However, excellent electrocatalysis at the electrode surface is required for optimum conversion efficiency. Serendipitous observation of Nafion-based electrocatalysis prompted the exploration of electrostatically charged self-assembled monolayers (SAMs) inside a thermocell. Both electrostatic electrocatalysis and improved electrode stability were observed; in an aqueous K3[Fe(CN)6]/K4[Fe(CN)6]-based cell, modification with (3-trimethylammonium bromide)thiopropane resulted in higher electrical power, and protection against [Fe(CN)6]3-/4--induced gold passivation, relative to bare gold. Molecular-based electrostatic electrocatalysis could be an alternative to precious metal-based nanomaterial electrocatalysis, and could be integrated with (nano)carbon-based electrodes to further enhance the ability of thermogalvanic and other electrochemical energy conversion devices, e.g. redox flow batteries.
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Affiliation(s)
- Kristine Laws
- Department of Chemistry, Britannia House, King's College London London SE1 1DB UK
| | - Mark A Buckingham
- Department of Chemistry, Britannia House, King's College London London SE1 1DB UK
| | - Leigh Aldous
- Department of Chemistry, Britannia House, King's College London London SE1 1DB UK
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2
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Zámbó D, Kovács D, Radnóczi G, Horváth ZE, Sulyok A, Tolnai I, Deák A. Structural Control Enables Catalytic and Electrocatalytic Activity of Porous Tetrametallic Nanorods. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2400421. [PMID: 38431934 DOI: 10.1002/smll.202400421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 02/12/2024] [Indexed: 03/05/2024]
Abstract
Integrating more than one type of metal into a nanoparticle that has a well-defined morphology and composition expands the functionalities of nanocatalysts. For a metal core/porous multimetallic shell nanoparticle, the availability of catalytically active surface sites and molecular mass transport can be enhanced, and the multielemental synergy can facilitate intraparticle charge transport. In this work, a reliable and robust synthesis of such a functional tetrametallic nanoparticle type is presented, where a micro- and mesoporous PdPtIr shell is grown on Au nanorods. The effect of critical synthesis parameters, namely temperature and the addition of HCl are investigated on the hydrodynamic size of the micellar pore template as well as on the stability of the metal chloride complexes and various elemental analysis techniques prove composition of the porous multimetallic shell. Due to the synergistic properties, the tetrametallic nanorods possess extensive negative surface charge making them a promising catalyst in reduction reactions. Dye degradation as well as the conversion of p-nitrophenol to p-aminophenol is catalyzed by the supportless nanorods without light illumination. By depositing the particles onto conductive substrates, the nanostructured electrodes show promising electrocatalytic activity in ethanol oxidation reaction. The nanocatalyst presents excellent morphological stability during all the catalytic test reactions.
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Affiliation(s)
- Dániel Zámbó
- HUN-REN Centre for Energy Research, Konkoly-Thege M. út 29-33, Budapest, H-1121, Hungary
| | - Dávid Kovács
- HUN-REN Centre for Energy Research, Konkoly-Thege M. út 29-33, Budapest, H-1121, Hungary
- Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, Budapest, H-1111, Hungary
| | - GyörgyZ Radnóczi
- HUN-REN Centre for Energy Research, Konkoly-Thege M. út 29-33, Budapest, H-1121, Hungary
| | - Zsolt E Horváth
- HUN-REN Centre for Energy Research, Konkoly-Thege M. út 29-33, Budapest, H-1121, Hungary
| | - Attila Sulyok
- HUN-REN Centre for Energy Research, Konkoly-Thege M. út 29-33, Budapest, H-1121, Hungary
| | - István Tolnai
- HUN-REN Centre for Energy Research, Konkoly-Thege M. út 29-33, Budapest, H-1121, Hungary
| | - András Deák
- HUN-REN Centre for Energy Research, Konkoly-Thege M. út 29-33, Budapest, H-1121, Hungary
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3
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Ejsmont A, Darvishzad T, Słowik G, Stelmachowski P, Goscianska J. Cobalt-based MOF-derived carbon electrocatalysts with tunable architecture for enhanced oxygen evolution reaction. J Colloid Interface Sci 2024; 653:1326-1338. [PMID: 37801843 DOI: 10.1016/j.jcis.2023.09.172] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 09/17/2023] [Accepted: 09/28/2023] [Indexed: 10/08/2023]
Abstract
Development of the hydrogen economy requires the design of catalysts that increase the rate of the accompanying sluggish kinetic oxygen evolution reaction (OER). This is a key process in electrochemical energy conversion and storage, such as water splitting and metal-air batteries. The OER needs high overpotential and typically expensive precious metal-based catalysts. Therefore, designing low-cost and efficient electrocatalysts for OER is of paramount importance. In addition to focusing on the number of active sites or high specific surface area, the correlation between catalyst particle shape and performance should be considered. This work presents an electrocatalytic activity comparison of cobalt-containing carbons with different morphologies in the OER process. Employing metal-organic frameworks as carbon and metal precursors, the materials in the shape of polyhedrons, needles, unique spherical hedgehogs, and sea urchins were obtained. The effect of MOF template infiltration with additional carbon source on the physicochemical properties of electrocatalysts was also examined. The furfuryl alcohol-impregnated needle-shaped particles were characterized by a high content of cobalt active sites, surrounded by nitrogen-containing graphite layers. Electrochemical tests confirmed their best activity (overpotential 317 mV@10 mA/cm2), long stability (up to 20 h), as well as low reagents diffusion limitations (Tafel slope 57 mV/dec up to 24 mA/cm2). The vertically aligned structure of the catalyst contributed to improved detachment of the oxygen bubbles produced.
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Affiliation(s)
- Aleksander Ejsmont
- Adam Mickiewicz University, Faculty of Chemistry, Department of Chemical Technology, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland
| | - Termeh Darvishzad
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Krakow, Poland
| | - Grzegorz Słowik
- Maria Curie-Sklodowska University in Lublin, Faculty of Chemistry, Maria Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland
| | - Pawel Stelmachowski
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Krakow, Poland
| | - Joanna Goscianska
- Adam Mickiewicz University, Faculty of Chemistry, Department of Chemical Technology, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.
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4
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Otake A, Asai K, Einaga Y. Anode Reaction Control for a Single-Compartment Electrochemical CO 2 Reduction Reactor with a Surface-Activated Diamond Cathode. Chemistry 2023:e202302798. [PMID: 38093560 DOI: 10.1002/chem.202302798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Indexed: 12/23/2023]
Abstract
The electrochemical reaction of carbon dioxide (CO2 ) in aqueous electrolyte solutions is attracting increasing attention for sustainable chemical production. Boron-doped diamond (BDD) electrodes have been previously shown to be very effective for the stable electrochemical production of formic acid from CO2 . Typically, the electrochemical production of formic acid by CO2 reduction (CO2 R) reaction is performed with a dual-compartment flow reactor equipped with a membrane separator. The problems caused by the membrane separator, such as scaling-up, complicated operational control and materials costs can be solved using a membrane free single-compartment reactor. Here we demonstrate anode reaction control for a single-compartment CO2 R flow reactor using a surface-activated BDD cathode and achieve a Faradaic efficiency for formic acid production of over 70 %.
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Affiliation(s)
- Atsushi Otake
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama, 223-8522, Japan
| | - Kana Asai
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama, 223-8522, Japan
| | - Yasuaki Einaga
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama, 223-8522, Japan
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5
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Kakati N, Anderson L, Li G, Sua-An DM, Karmakar A, Ocon JD, Chuang PYA. Indispensable Nafion Ionomer for High-Efficiency and Stable Oxygen Evolution Reaction in Alkaline Media. ACS APPLIED MATERIALS & INTERFACES 2023; 15:55559-55569. [PMID: 38058109 DOI: 10.1021/acsami.3c08377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
Addressing the challenge of sluggish kinetics and limited stability in alkaline oxygen evolution reactions, recent exploration of novel electrochemical catalysts offers improved prospects. To expedite the assessment of these catalysts, a half-cell rotating disk electrode is often favored for its simplicity. However, the actual catalyst performance strongly depends on the fabricated catalyst layers, which encounter mass transport overpotentials. We systematically investigate the role and sequence of electrode drop-casting methods onto a glassy carbon electrode regarding the efficiency of the oxygen evolution reaction. The catalyst layer without Nafion experiences nearly 50% activity loss post stability test, while those with Nafion exhibit less than 5% activity loss. Additionally, the sequence of application of the catalyst and Nafion also shows a significant effect on catalyst stability. The catalyst activity increases by roughly 20% after the stability test when the catalyst layer is coated first with an ionomer layer, followed by drop-casting the catalysts. Based on the half-cell results, the Nafion ionomer not only acts as a binder in the catalyst layer but also enhances the interfacial interaction between the catalyst and electrolyte, promoting performance and stability. This study provides new insights into the efficient and accurate evaluation of electrocatalyst performance and stability as well as the role of Nafion ionomer in the catalyst layer.
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Affiliation(s)
- Nitul Kakati
- Department of Mechanical Engineering, University of California, Merced, Merced, California 95343, United States
| | - Lawrence Anderson
- Department of Mechanical Engineering, University of California, Merced, Merced, California 95343, United States
| | - Guangfu Li
- Department of Mechanical Engineering, University of California, Merced, Merced, California 95343, United States
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology, Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan 528200, China
| | - Desiree Mae Sua-An
- Department of Mechanical Engineering, University of California, Merced, Merced, California 95343, United States
- Laboratory of Electrochemical Engineering, Department of Chemical Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines
| | - Ayon Karmakar
- Department of Mechanical Engineering, University of California, Merced, Merced, California 95343, United States
| | - Joey D Ocon
- Laboratory of Electrochemical Engineering, Department of Chemical Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines
| | - Po-Ya Abel Chuang
- Department of Mechanical Engineering, University of California, Merced, Merced, California 95343, United States
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6
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Yue P, Fu Q, Li J, Zhang L, Ye D, Zhu X, Liao Q. Microenvironment Regulation Strategies Facilitating High-Efficiency CO 2 Electrolysis in a Zero-Gap Bipolar Membrane Electrolyzer. ACS APPLIED MATERIALS & INTERFACES 2023; 15:53429-53435. [PMID: 37957114 DOI: 10.1021/acsami.3c10817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
In alkaline and neutral zero-gap CO2 electrolyzers, the carbon utilization efficiency of the electrocatalytic CO2 reduction to CO is less than 50% because of inherently homogeneous reactions. Utilization of the bipolar membrane (BPM) electrolyzer can effectively suppress (bi)carbonate formation and parasitic CO2 losses; however, an excessive concentration of H+ in the catalyst layer (CL) significantly hinders the activity and selectivity for CO2 reduction. Here, we report a microenvironment regulation strategy that controls the CL thickness and ionomer content to regulate local CO2 transport and the local pH within the CL. We report 80% faradaic efficiency of CO at a current density of 400 mA/cm2 without the use of a buffering layer, exceeding that of state-of-the-art catalysts with a buffering layer. A carbon utilization efficiency of 63.6% at 400 mA/cm2 is also obtained. This study demonstrates the significance of regulating the microenvironment of the CL in a BPM system.
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Affiliation(s)
- Pengtao Yue
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Qian Fu
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Jun Li
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Liang Zhang
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Dingding Ye
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Xun Zhu
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Qiang Liao
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
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7
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Chakraborty S, Servottam S, Samal PK, Kalita D, Rao A, Bagchi D, Peter SC, Eswaramoorthy M. Highly Efficient Electrochemical Hydrogen Evolution with Ultra-Low Loading of Strongly Adhered Pt Nanoparticles on Carbon. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2303495. [PMID: 37434340 DOI: 10.1002/smll.202303495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 06/16/2023] [Indexed: 07/13/2023]
Abstract
The development of robust electrocatalysts with low platinum content for acidic hydrogen evolution reaction (HER) is paramount for large scale commercialization of proton exchange membrane electrolyzers. Herein, a simple strategy is reported to synthesize a well anchored, low Pt containing Vulcan carbon catalyst using ZnO as a sacrificial template. Pt containing ZnO (PZ) is prepared by a simultaneous borohydride reduction. PZ is then loaded onto Vulcan carbon to produce a very low Pt content electrocatalyst, PZ@VC. PZ@VC with 2 wt.% Pt shows excellent performance for acidic HER in comparison to the commercial Pt/C (20 wt.%) catalyst. PZ@VC with a very low Pt loading shows significantly low η10 and η100 values (15 and 46 mV, respectively). PZ@VC on coating with Nafion (PZ@VC-N) shows further improvement in its performance (η10 of 7 mV, η100 of 28 mV) with ≈300 h of stability (≈10 mA cm-2 ) with only 4 µgPt cm-2 . PZ@VC-N shows a record high mass activity of 71 A mgPt -1 (32 times larger than Pt/C (20 wt.%) at 50 mV of overpotential. Post reaction characterizations reveal Pt nanoparticles are embedded onto VC with no traces of zinc, suggestive of a strong metal-support interaction leading to this high stability at low Pt loading.
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Affiliation(s)
- Soumita Chakraborty
- Chemistry and Physics of Materials Unit, School of Advanced Materials (SAMat), JNCASR, Bengaluru, 560064, India
| | - Swaraj Servottam
- Chemistry and Physics of Materials Unit, School of Advanced Materials (SAMat), JNCASR, Bengaluru, 560064, India
| | - Pankaj Kumar Samal
- Chemistry and Physics of Materials Unit, School of Advanced Materials (SAMat), JNCASR, Bengaluru, 560064, India
| | - Daizy Kalita
- Chemistry and Physics of Materials Unit, School of Advanced Materials (SAMat), JNCASR, Bengaluru, 560064, India
| | - Ankit Rao
- Centre for Nano Science and Engineering, IISc, Bengaluru, Karnataka, 560012, India
| | - Debabrata Bagchi
- New Chemistry Unit, School of Advanced Materials (SAMat), JNCASR, Bengaluru, 560064, India
| | - Sebastian C Peter
- New Chemistry Unit, School of Advanced Materials (SAMat), JNCASR, Bengaluru, 560064, India
| | - Muthusamy Eswaramoorthy
- Chemistry and Physics of Materials Unit, School of Advanced Materials (SAMat), JNCASR, Bengaluru, 560064, India
- International Centre for Materials Science, School of Advanced Materials (SAMat), JNCASR, Bengaluru, 560064, India
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8
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Preikschas P, Martín AJ, Yeo BS, Pérez-Ramírez J. NMR-based quantification of liquid products in CO 2 electroreduction on phosphate-derived nickel catalysts. Commun Chem 2023; 6:147. [PMID: 37430001 DOI: 10.1038/s42004-023-00948-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 06/30/2023] [Indexed: 07/12/2023] Open
Abstract
Recently discovered phosphate-derived Ni catalysts have opened a new pathway towards multicarbon products via CO2 electroreduction. However, understanding the influence of basic parameters such as electrode potential, pH, and buffer capacity is needed for optimized C3+ product formation. To this end, rigorous catalyst evaluation and sensitive analytical tools are required to identify potential new products and minimize increasing quantification errors linked to long-chain carbon compounds. Herein, we contribute to enhance testing accuracy by presenting sensitive 1H NMR spectroscopy protocols for liquid product assessment featuring optimized water suppression and reduced experiment time. When combined with an automated NMR data processing routine, samples containing up to 12 products can be quantified within 15 min with low quantification limits equivalent to Faradaic efficiencies of 0.1%. These developments disclosed performance trends in carbon product formation and the detection of four hitherto unreported compounds: acetate, ethylene glycol, hydroxyacetone, and i-propanol.
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Affiliation(s)
- Phil Preikschas
- Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093, Zurich, Switzerland
| | - Antonio J Martín
- Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093, Zurich, Switzerland
| | - Boon Siang Yeo
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Javier Pérez-Ramírez
- Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093, Zurich, Switzerland.
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9
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Jiao C, Cao Z, He J, Liu Z, Zheng C, Peng S, Chen B. Co@Co Cages Engineered from Hollowing MOFs for Enhanced Hydrogen Evolution Reaction Performance. J Phys Chem Lett 2023:5447-5455. [PMID: 37285220 DOI: 10.1021/acs.jpclett.3c01287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Advances in hollow engineering of metal-organic frameworks (MOFs) have enabled a variety of applications in catalysts, sensors, and batteries, but the hollow derivatives are often limited to hydroxides, oxides, selenides, and sulfides with the presence of additional elements from the environment. Here we have successfully synthesized hollow metallic Co@Co cages through a facile two-step strategy. Interestingly, the Co@Co(C) cages with a small amount of residual carbon show excellent catalytic performance due to the abundant exposed active sites and fast charge transfer. During the hydrogen evolution reaction, the overpotential of Co@Co(C) is as low as ∼54 mV at the current density of 10 mA cm-2, which is close to that of ∼38 mV for the Pt/C electrodes. The two-step synthesis strategy opens up opportunities for increasing the number of catalytic active sites and rates of charge/mass transfer while pushing the limits of materials utilization beyond that achieved in existing MOF-based nanostructures.
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Affiliation(s)
- Chuangwei Jiao
- Center for Ultrafast Science and Technology, School of Chemistry and Chemical Engineering, and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zetan Cao
- Center for Ultrafast Science and Technology, School of Chemistry and Chemical Engineering, and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jia He
- Center for Ultrafast Science and Technology, School of Chemistry and Chemical Engineering, and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zhiwen Liu
- Center for Ultrafast Science and Technology, School of Chemistry and Chemical Engineering, and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Cheng Zheng
- Center for Ultrafast Science and Technology, School of Chemistry and Chemical Engineering, and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Simin Peng
- Center for Ultrafast Science and Technology, School of Chemistry and Chemical Engineering, and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Bin Chen
- Center for Ultrafast Science and Technology, School of Chemistry and Chemical Engineering, and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
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10
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Ding P, An H, Zellner P, Guan T, Gao J, Müller-Buschbaum P, Weckhuysen BM, van der Stam W, Sharp ID. Elucidating the Roles of Nafion/Solvent Formulations in Copper-Catalyzed CO 2 Electrolysis. ACS Catal 2023; 13:5336-5347. [PMID: 37123601 PMCID: PMC10127206 DOI: 10.1021/acscatal.2c05235] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 03/14/2023] [Indexed: 04/08/2023]
Abstract
Nafion ionomer, composed of hydrophobic perfluorocarbon backbones and hydrophilic sulfonic acid side chains, is the most widely used additive for preparing catalyst layers (CLs) for electrochemical CO2 reduction, but its impact on the performance of CO2 electrolysis remains poorly understood. Here, we systematically investigate the role of the catalyst ink formulation on CO2 electrolysis using commercial CuO nanoparticles as the model pre-catalyst. We find that the presence of Nafion is essential for achieving stable product distributions due to its ability to stabilize the catalyst morphology under reaction conditions. Moreover, the Nafion content and solvent composition (water/alcohol fraction) regulate the internal structure of Nafion coatings, as well as the catalyst morphology, thereby significantly impacting CO2 electrolysis performance, resulting in variations of C2+ product Faradaic efficiency (FE) by >3×, with C2+ FE ranging from 17 to 54% on carbon paper substrates. Using a combination of ellipsometry and in situ Raman spectroscopy during CO2 reduction, we find that such selectivity differences stem from changes to the local reaction microenvironment. In particular, the combination of high water/alcohol ratios and low Nafion fractions in the catalyst ink results in stable and favorable microenvironments, increasing the local CO2/H2O concentration ratio and promoting high CO surface coverage to facilitate C2+ production in long-term CO2 electrolysis. Therefore, this work provides insights into the critical role of Nafion binders and underlines the importance of optimizing Nafion/solvent formulations as a means of enhancing the performance of electrochemical CO2 reduction systems.
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Affiliation(s)
- Pan Ding
- Walter Schottky Institute and Physics Department, Technical University of Munich, Am Coulombwall 4, 85748 Garching, Germany
| | - Hongyu An
- Inorganic Chemistry and Catalysis, Department of Chemistry, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Philipp Zellner
- Walter Schottky Institute and Physics Department, Technical University of Munich, Am Coulombwall 4, 85748 Garching, Germany
| | - Tianfu Guan
- Chair for Functional Materials, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Jianyong Gao
- Walter Schottky Institute and Physics Department, Technical University of Munich, Am Coulombwall 4, 85748 Garching, Germany
| | - Peter Müller-Buschbaum
- Chair for Functional Materials, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
- Heinz Maier-Leibnitz-Zentrum, Technical University of Munich, 85748 Garching, Germany
| | - Bert M. Weckhuysen
- Inorganic Chemistry and Catalysis, Department of Chemistry, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Ward van der Stam
- Inorganic Chemistry and Catalysis, Department of Chemistry, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Ian D. Sharp
- Walter Schottky Institute and Physics Department, Technical University of Munich, Am Coulombwall 4, 85748 Garching, Germany
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11
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Wang L, Zhao K, Qi Z, Yang Y, Luo W, Yang W, Li L, Hao J, Shi W. Crystalline-Dependent Discharge Process of Locally Enhanced Electrooxidation Activity on Ni 2P. Inorg Chem 2023; 62:2470-2479. [PMID: 36701249 DOI: 10.1021/acs.inorgchem.2c04462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The state-of-the-art transition-based electrocatalysts in alkaline media generally suffer from unavoidable surface reconstruction during oxygen evolution reaction measurements, leading to the collapse and loss of the crystalline matrix. Low potential discharge offers a gentle way for surface reconstruction and thus realizes the manipulation of the real active site. Nevertheless, the absence of a fundamental understanding focus on this discharge region renders the functional phase, either the crystalline or amorphous matrix, for the controllable reconstruction still undecidable. Herein, we report a scenario to employ different crystalline matrices as electrocatalysts for discharge region reconstruction. The representative low crystalline Ni2P (LC-Ni2P) possesses a relatively weak surface structure compared with highly crystalline or amorphous Ni2P (HC-Ni2P or A-Ni2P), which contributes abundant oxygen vacancies after the discharge process. The fast discharge behavior of LC-Ni2P leads to the uniform distribution of these vacancies and thus endows the inner interface with reactant activating functionality. A high increase in current density of 36.7% is achieved at 2.32 V (vs RHE) for the LC-Ni2P electrode. The understanding of the discharge behavior in this study, on different crystalline matrices, presents insights into the establishment of controllable surface reconstruction for an effective oxygen evolution reaction.
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Affiliation(s)
- Ling Wang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013Jiangsu Province, China
| | - Kun Zhao
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013Jiangsu Province, China
| | - Zhihao Qi
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013Jiangsu Province, China
| | - Yonggang Yang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013Jiangsu Province, China
| | - Wei Luo
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013Jiangsu Province, China
| | - Wenshu Yang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013Jiangsu Province, China
| | - Longhua Li
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013Jiangsu Province, China
| | - Jinhui Hao
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013Jiangsu Province, China
| | - Weidong Shi
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013Jiangsu Province, China
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12
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Chen D, Chen N, Liu F, Wang Y, Liang H, Yang Y, Yuan Q. Flexible Point-of-Care Electrodes for Ultrasensitive Detection of Bladder Tumor-Relevant miRNA in Urine. Anal Chem 2023; 95:1847-1855. [PMID: 36607132 DOI: 10.1021/acs.analchem.2c03156] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Portable point-of-care testing (POCT) is currently drawing enormous attention owing to its great potential for disease diagnosis and personal health management. Electrochemical biosensors, with the intrinsic advantages of cost-effectiveness, fast response, ease of miniaturization, and integration, are considered as one of the most promising candidates for POCT application. However, the clinical application of electrochemical biosensors-based POCT is hindered by the decreased detection sensitivity due to the low abundance of disease-relevant biomolecules in extremely complex biological samples. Herein, we construct a flexible electrochemical biosensor based on single-stranded DNA functionalized single-walled carbon nanotubes (ssDNA-SWNTs) for high sensitivity and stability detection of miRNA-21 in human urine to achieve bladder cancer (BCa) diagnosis and classification. The ssDNA-SWNT electrodes with a 2D interconnected network structure exhibit a high electrical conductivity, thus enabling the ultrasensitive detection of miRNA-21 with a detection limit of 3.0 fM. Additionally, the intrinsic flexibility of ssDNA-SWNT electrodes endows the biosensors with the capability to achieve high stability detection of miRNA-21 even under large bending deformations. In a cohort of 40 BCa patients at stages I-III and 44 negative control samples, the constructed ssDNA-SWNT biosensors could detect BCa with a 92.5% sensitivity, an 88.6% specificity, and classify the cancer stages with an overall accuracy of 81.0%. Additionally, the flexible ssDNA-SWNT biosensors could also be utilized for treatment efficiency assessment and cancer recurrence monitoring. Owing to their excellent sensitivity and stability, the designed flexible ssDNA-SWNT biosensors in this work propose a strategy to realize point-of-care detection of complex clinical samples to achieve personalized healthcare.
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Affiliation(s)
- Duo Chen
- College of Chemistry and Molecular Sciences, School of Microelectronics, Wuhan University, Wuhan 430072, P. R. China
| | - Na Chen
- College of Chemistry and Molecular Sciences, School of Microelectronics, Wuhan University, Wuhan 430072, P. R. China
| | - Fangning Liu
- Urology Department, Union Hospital, Tongji Medical College of Huazhong Science and Technology University, Wuhan 430000, P. R. China
| | - Yiming Wang
- College of Chemistry and Molecular Sciences, School of Microelectronics, Wuhan University, Wuhan 430072, P. R. China
| | - Huageng Liang
- Urology Department, Union Hospital, Tongji Medical College of Huazhong Science and Technology University, Wuhan 430000, P. R. China
| | - Yanbing Yang
- College of Chemistry and Molecular Sciences, School of Microelectronics, Wuhan University, Wuhan 430072, P. R. China
| | - Quan Yuan
- College of Chemistry and Molecular Sciences, School of Microelectronics, Wuhan University, Wuhan 430072, P. R. China
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
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13
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Jiang W, Lehnert W, Shviro M. The Influence of Loadings and Substrates on the Performance of Nickel‐Based Catalysts for the Oxygen Evolution Reaction. ChemElectroChem 2023. [DOI: 10.1002/celc.202200991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Wulyu Jiang
- Forschungszentrum Jülich GmbH Institute of Energy and Climate Research Electrochemical Process Engineering (IEK-14) 52425 Jülich Germany
- Faculty of Mechanical Engineering RWTH Aachen University 52056 Aachen Germany
| | - Werner Lehnert
- Forschungszentrum Jülich GmbH Institute of Energy and Climate Research Electrochemical Process Engineering (IEK-14) 52425 Jülich Germany
- Faculty of Mechanical Engineering RWTH Aachen University 52056 Aachen Germany
| | - Meital Shviro
- Forschungszentrum Jülich GmbH Institute of Energy and Climate Research Electrochemical Process Engineering (IEK-14) 52425 Jülich Germany
- Present address: Chemistry and Nanoscience Center National Renewable Energy Laboratory (NREL) Golden CO 80401 United States
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14
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Zhao Z, Zhu M, Luo X, Cheng H, Chen H, Xuan W, Zheng H. Synergistic effects of nano-structured WO 3-Se heterojunction decorated by organic Nafion layer on improving photoelectrochemical performance. NANOTECHNOLOGY 2022; 34:045401. [PMID: 36265458 DOI: 10.1088/1361-6528/ac9c0a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Accepted: 10/20/2022] [Indexed: 06/16/2023]
Abstract
Exploration of high-performance photoanodes is considered as an essential challenge in photoelectrochemical (PEC) water splitting due to the complex four-electron reaction in water oxidation. Herein, the nano-structured WO3-Se heterojunction decorated by organic Nafion layer is designed. The optimized WO3-Se200-0.05Nafion photoanode shows a remarkable photocurrent of 1.40 mA cm-2at 1.23 V versus reversible hydrogen electrode, which is 2.5-fold higher than that of pure WO3nanosheets (WO3NS) photoelectrode. Remarkably, the photocurrent increments of WO3-Se200-0.05Nafion is larger than the increment sum of WO3-Se200 and WO3-0.05Nafion, which affirming the synergistic effect of Se nanospheres and Nafion layer. The improved PEC performances are attributed to the quick charge separation and transfer, the increased electric conductivity, and the excellent kinetics of oxygen evolution, which is derived from the strong interaction among WO3, Se and Nafion. Meanwhile, the better visible-light harvesting from Se nanospheres as photosensitizer and the induction of transparent Nafion as a passivation layer can explain this synergy. It hopes this heterostructure design with organic Nafion decoration can inspire to exploit outstanding performance photoanodes for PEC water splitting.
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Affiliation(s)
- Zhefei Zhao
- Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China
| | - Mengkai Zhu
- Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China
| | - Xingyu Luo
- Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China
| | - Hongbo Cheng
- Quzhou BDX New Chemical Materials Co., Ltd, Quzhou 324012, People's Republic of China
| | - Hongsong Chen
- Quzhou BDX New Chemical Materials Co., Ltd, Quzhou 324012, People's Republic of China
| | - Weidong Xuan
- College of Water and Environmental Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, People's Republic of China
| | - Huajun Zheng
- Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China
- State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China
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15
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Ghosh AB, Chanda DK, Koppisetti HV, Sardar S, Banerjee R, Biswas P, Bandyopadhyay A. Improved Performance of Cobalt Hydroxychloride Nanoparticles on Poly (3-bromo thiophene) Template for Electrochemical Oxygen Evolution Reaction. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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16
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Li H, Quispe-Cardenas E, Yang S, Yin L, Yang Y. Electrosynthesis of >20 g/L H 2O 2 from Air. ACS ES&T ENGINEERING 2022; 2:242-250. [PMID: 35178529 PMCID: PMC8845047 DOI: 10.1021/acsestengg.1c00366] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 11/17/2021] [Accepted: 11/18/2021] [Indexed: 05/30/2023]
Abstract
Hydrogen peroxide (HP) production via electrochemical oxygen reduction reaction (ORR-HP) is a critical reaction for energy storage and environmental remediation. The onsite production of high-concentration H2O2 using gas diffusion electrodes (GDEs) fed by air is especially attractive. However, many studies indicate that the air-GDE combination could not produce concentrated H2O2, as the [H2O2] leveled off or even decreased with the increasing reaction time. This study proves that the limiting factors are not the oxygen concentration in the air but the anodic and cathodic depletion of the as-formed H2O2. We proved that the anodic depletion could be excluded by adopting a divided electrolytic cell. Furthermore, we demonstrated that applying poly(tetrafluoroethylene) (PTFE) as an overcoating rather than a catalyst binder could effectively mitigate the cathodic decomposition pathways. Beyond that, we further developed a composite electrospun PTFE (E-PTFE)/carbon black (CB)/GDE electrode featuring the electrospun PTFE (E-PTFE) nanofibrous overcoating. The E-PTFE coating provides abundant triphase active sites and excludes the cathodic depletion reaction, enabling the production of >20 g/L H2O2 at a current efficiency of 86.6%. Finally, we demonstrated the efficacy of the ORR-HP device in lake water remediation. Cyanobacteria and microcystin-LR were readily removed along with the onsite production of H2O2.
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Affiliation(s)
- Huihui Li
- State
Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
- Department
of Civil and Environmental Engineering, Clarkson University, Potsdam, New York 13699, United States
| | - Estefanny Quispe-Cardenas
- Department
of Civil and Environmental Engineering, Clarkson University, Potsdam, New York 13699, United States
| | - Shasha Yang
- Department
of Civil and Environmental Engineering, Clarkson University, Potsdam, New York 13699, United States
| | - Lifeng Yin
- State
Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Yang Yang
- Department
of Civil and Environmental Engineering, Clarkson University, Potsdam, New York 13699, United States
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17
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Construction of iridium oxide nanoparticle modified indium tin oxide electrodes with polycarboxylic acids and pyrophosphoric acid and their application to water oxidation reactions. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138683] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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18
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Hao J, Luo W, Wang S, Zhao K, Hou J, Li L, Ge B, Yang W, Shi W. Discharge-Induced Enhancement of the Oxygen Evolution Reaction. Angew Chem Int Ed Engl 2021; 60:20042-20048. [PMID: 34254417 DOI: 10.1002/anie.202108770] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Indexed: 11/06/2022]
Abstract
The fundamental understanding of the surface reconstruction induced by the applied potential is of great significance for enhancing the oxygen evolution reaction (OER). Here, we show that a previously overlooked discharge current in the low applied potential region also leads to in situ electrochemical activation of a nitrogen-doped nickel oxyhydroxide surface. We exploit the fact that doping of heteroatoms weakens the surface structure, and hence, a weak discharge current originating from the capacitive nature of nickel oxyhydroxide has a strong structure-reforming ability to promote the formation of nitrogen and oxygen vacancies. The current density at 1.4 V (vs. Hg/HgO) can dramatically increase by as much as 31.3 % after discharge in the low applied potential region. This work provides insight into in situ enhancement of the OER and suggests that the low applied potential region must be a primary consideration in evaluating the origin of the activity of electrocatalysts.
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Affiliation(s)
- Jinhui Hao
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Wei Luo
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Shuaishuai Wang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Kun Zhao
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Jianwen Hou
- Department Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science, Engineering, Southwest Jiaotong University, Chengdu, 610031, P. R. China
| | - Longhua Li
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Baoxin Ge
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Wenshu Yang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Weidong Shi
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
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19
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20
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Morales DM, Villalobos J, Kazakova MA, Xiao J, Risch M. Nafion-Induced Reduction of Manganese and its Impact on the Electrocatalytic Properties of a Highly Active MnFeNi Oxide for Bifunctional Oxygen Conversion. ChemElectroChem 2021; 8:2979-2983. [PMID: 34595088 PMCID: PMC8457226 DOI: 10.1002/celc.202100744] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 07/21/2021] [Indexed: 11/30/2022]
Abstract
Electrocatalysts for bifunctional oxygen reduction (ORR) and oxygen evolution reactions (OER) are commonly studied under hydrodynamic conditions, rendering the use of binders necessary to ensure the mechanical stability of the electrode films. The presence of a binder, however, may influence the properties of the materials under examination to an unknown extent. Herein, we investigate the impact of Nafion on a highly active ORR/OER catalyst consisting of MnFeNi oxide nanoparticles supported on multi-walled carbon nanotubes. Electrochemical studies revealed that, in addition to enhancing the mechanical stability and particle connectivity, Nafion poses a major impact on the ORR selectivity, which correlates with a decrease in the valence state of Mn according to X-ray absorption spectroscopy. These findings call for awareness regarding the use of electrode additives, since in some cases the extent of their impact on the properties of electrode films cannot be regarded as negligible.
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Affiliation(s)
- Dulce M. Morales
- Nachwuchsgruppe Gestaltung des SauerstoffentwicklungsmechanismusHelmholtz-Zentrum Berlin für Materialien und Energie GmbHHahn-Meitner-Platz 114109BerlinGermany
| | - Javier Villalobos
- Nachwuchsgruppe Gestaltung des SauerstoffentwicklungsmechanismusHelmholtz-Zentrum Berlin für Materialien und Energie GmbHHahn-Meitner-Platz 114109BerlinGermany
| | - Mariya A. Kazakova
- Boreskov Institute of CatalysisSB RASLavrentieva 5630090NovosibirskRussia
| | - Jie Xiao
- Department of Highly Sensitive X-ray SpectroscopyHelmholtz-Zentrum Berlin für Materialien und Energie GmbHAlbert-Einstein-Straße 1512489BerlinGermany
| | - Marcel Risch
- Nachwuchsgruppe Gestaltung des SauerstoffentwicklungsmechanismusHelmholtz-Zentrum Berlin für Materialien und Energie GmbHHahn-Meitner-Platz 114109BerlinGermany
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21
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Faid AY, Barnett AO, Seland F, Sunde S. NiCu mixed metal oxide catalyst for alkaline hydrogen evolution in anion exchange membrane water electrolysis. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.137837] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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22
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Kumaravel S, Saravanan KK, Evangeline BE, Niharika V, Jayakumar R, Kundu S. DNA-based low resistance palladium nano-spheres for effective hydrogen evolution reaction. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00986a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Highly stable and less resistance Pd/DNA NSs are designed for HER in acidic medium and require a low overpotential (η10) of 79 mV. DNA plays multiple roles such as stabilizer, structure-directing agent and binder in the fabrication of electrodes.
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Affiliation(s)
- Sangeetha Kumaravel
- Electrochemical Process Engineering (EPE) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi-630003, Tamil Nadu, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Karthik Kumaran Saravanan
- Electrochemical Process Engineering (EPE) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi-630003, Tamil Nadu, India
| | - Bariki Eunice Evangeline
- Electrochemical Process Engineering (EPE) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi-630003, Tamil Nadu, India
| | - Vennala Niharika
- Electrochemical Process Engineering (EPE) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi-630003, Tamil Nadu, India
| | - Rishivandhiga Jayakumar
- Electrochemical Process Engineering (EPE) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi-630003, Tamil Nadu, India
| | - Subrata Kundu
- Electrochemical Process Engineering (EPE) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi-630003, Tamil Nadu, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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23
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Gutiérrez-Tarriño S, Olloqui-Sariego JL, Calvente JJ, Espallargas GM, Rey F, Corma A, Oña-Burgos P. Cobalt Metal-Organic Framework Based on Layered Double Nanosheets for Enhanced Electrocatalytic Water Oxidation in Neutral Media. J Am Chem Soc 2020; 142:19198-19208. [PMID: 33125226 DOI: 10.1021/jacs.0c08882] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A new cobalt metal-organic framework (2D-Co-MOF) based on well-defined layered double cores that are strongly connected by intermolecular bonds has been developed. Its 3D structure is held together by π-π stacking interactions between the labile pyridine ligands of the nanosheets. In aqueous solution, the axial pyridine ligands are exchanged by water molecules, producing a delamination of the material, where the individual double nanosheets preserve their structure. The original 3D layered structure can be restored by a solvothermal process with pyridine, so that the material shows a "memory effect" during the delamination-pillarization process. Electrochemical activation of a 2D-Co-MOF@Nafion-modified graphite electrode in aqueous solution improves the ionic migration and electron transfer across the film and promotes the formation of the electrocatalytically active cobalt species for the oxygen evolution reaction (OER). The so-activated 2D-Co-MOF@Nafion composite exhibits an outstanding electrocatalytic performance for the OER at neutral pH, with a TOF value (0.034 s-1 at an overpotential of 400 mV) and robustness superior to those reported for similar electrocatalysts under similar conditions. The particular topology of the delaminated nanosheets, with quite distant cobalt centers, precludes the direct coupling between the electrocatalytically active centers of the same sheet. On the other hand, the increase in ionic migration across the film during the electrochemical activation stage rules out the intersheet coupling between active cobalt centers, as this scenario would impair electrolyte permeation. Altogether, the most plausible mechanism for the O-O bond formation is the water nucleophilic attack to single Co(IV)-oxo or Co(III)-oxyl centers. Its high electrochemical efficiency suggests that the presence of nitrogen-containing aromatic equatorial ligands facilitates the water nucleophilic attack, as in the case of the highly efficient cobalt porphyrins.
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Affiliation(s)
- Silvia Gutiérrez-Tarriño
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas (UPV-CSIC), Avda. de los Naranjos s/n, 46022 Valencia, Spain
| | - José Luis Olloqui-Sariego
- Departamento de Química Física, Universidad de Sevilla. Profesor García González 1. 41012 Sevilla, Spain
| | - Juan José Calvente
- Departamento de Química Física, Universidad de Sevilla. Profesor García González 1. 41012 Sevilla, Spain
| | - Guillermo Mínguez Espallargas
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, c/Catedrático José Beltrán, 2, 46980 Paterna, Spain
| | - Fernando Rey
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas (UPV-CSIC), Avda. de los Naranjos s/n, 46022 Valencia, Spain
| | - Avelino Corma
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas (UPV-CSIC), Avda. de los Naranjos s/n, 46022 Valencia, Spain
| | - Pascual Oña-Burgos
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas (UPV-CSIC), Avda. de los Naranjos s/n, 46022 Valencia, Spain.,Departamento de Química y Física, Centro de Investigación CIAIMBITAL, Universidad de Almería, Ctra. Sacramento, s/n, 04120 Almería, Spain
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24
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The Influence of the Electrodeposition Parameters on the Properties of Mn-Co-Based Nanofilms as Anode Materials for Alkaline Electrolysers. MATERIALS 2020; 13:ma13112662. [PMID: 32545248 PMCID: PMC7321643 DOI: 10.3390/ma13112662] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 06/05/2020] [Accepted: 06/10/2020] [Indexed: 12/04/2022]
Abstract
In this work, the influence of the synthesis conditions on the structure, morphology, and electrocatalytic performance for the oxygen evolution reaction (OER) of Mn-Co-based films is studied. For this purpose, Mn-Co nanofilm is electrochemically synthesised in a one-step process on nickel foam in the presence of metal nitrates without any additives. The possible mechanism of the synthesis is proposed. The morphology and structure of the catalysts are studied by various techniques including scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. The analyses show that the as-deposited catalysts consist mainly of oxides/hydroxides and/or (oxy)hydroxides based on Mn2+, Co2+, and Co3+. The alkaline post-treatment of the film results in the formation of Mn-Co (oxy)hydroxides and crystalline Co(OH)2 with a β-phase hexagonal platelet-like shape structure, indicating a layered double hydroxide structure, desirable for the OER. Electrochemical studies show that the catalytic performance of Mn-Co was dependent on the concentration of Mn versus Co in the synthesis solution and on the deposition charge. The optimised Mn-Co/Ni foam is characterised by a specific surface area of 10.5 m2·g−1, a pore volume of 0.0042 cm3·g−1, and high electrochemical stability with an overpotential deviation around 330–340 mV at 10 mA·cm−2geo for 70 h.
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25
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Khandavalli S, Park JH, Kariuki NN, Zaccarine SF, Pylypenko S, Myers DJ, Ulsh M, Mauger SA. Investigation of the Microstructure and Rheology of Iridium Oxide Catalyst Inks for Low-Temperature Polymer Electrolyte Membrane Water Electrolyzers. ACS APPLIED MATERIALS & INTERFACES 2019; 11:45068-45079. [PMID: 31697470 DOI: 10.1021/acsami.9b14415] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We present an investigation of the structure and rheological behavior of catalyst inks for low-temperature polymer electrolyte membrane water electrolyzers. The ink consists of iridium oxide (IrO2) catalyst particles and a Nafion ionomer dispersed in a mixture of 1-propanol and water. The effects of ionomer concentration and catalyst concentration on the microstructure of the catalyst ink were studied. Studies on dilute inks (0.1 wt % IrO2) using zeta potential and dynamic light scattering measurements indicated a strong adsorption of the ionomer onto the catalyst particles which resulted in an increase in the ζ-potential and the z-average diameter. Steady-shear and dynamic-oscillatory-shear rheological measurements of concentrated IrO2 dispersions (35 wt % IrO2) indicated that the particles are strongly agglomerated in the absence of the ionomer. The addition of even a small amount of the ionomer (2.4 wt % with respect to total solids) caused the rheology to transition from shear thinning to Newtonian because of the reduction in agglomerated structure due to stabilization of the aggregates by the ionomer, consistent with the behavior of dilute inks. At intermediate ionomer loadings, between 2.4 and 9 wt %, the viscosity increased with increasing ionomer wt %, though remained Newtonian, predominantly due to the increasing ionomer volume fraction in the ink. For ionomer loadings greater than 9 wt %, the particles were found to be flocculated, likely induced by a dispersed ionomer. The flocculated inks exhibited strong shear-thinning and gel-like behaviors in steady-shear and oscillatory-shear rheology. The onset of flocculation was found to be sensitive to the catalyst concentration, where below 35 wt % of IrO2, flocculation was not observed. The rheological observations were further verified by ultra-small-angle X-ray scattering.
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Affiliation(s)
- Sunilkumar Khandavalli
- Chemistry and Nanoscience Center , National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
| | - Jae Hyung Park
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Lemont , Illinois 60439 , United States
| | - Nancy N Kariuki
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Lemont , Illinois 60439 , United States
| | - Sarah F Zaccarine
- Department of Chemistry , Colorado School of Mines , Golden , Colorado 80401 , United States
| | - Svitlana Pylypenko
- Department of Chemistry , Colorado School of Mines , Golden , Colorado 80401 , United States
| | - Deborah J Myers
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Lemont , Illinois 60439 , United States
| | - Michael Ulsh
- Chemistry and Nanoscience Center , National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
| | - Scott A Mauger
- Chemistry and Nanoscience Center , National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
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26
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Li GF, Divinagracia M, Labata MF, Ocon JD, Abel Chuang PY. Electrolyte-Dependent Oxygen Evolution Reactions in Alkaline Media: Electrical Double Layer and Interfacial Interactions. ACS APPLIED MATERIALS & INTERFACES 2019; 11:33748-33758. [PMID: 31436074 DOI: 10.1021/acsami.9b06889] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Traditional understanding of electrocatalytic reactions generally focuses on either covalent interactions between adsorbates and the reaction interface (i.e., electrical double layer, EDL) or electrostatic interactions between electrolyte ions. Here, our work provides valuable insights into interfacial structure and ionic interactions during alkaline oxygen evolution reaction (OER). The importance of inner-sphere OH- adsorption is demonstrated as the IrOx activity in 4.0 M KOH is 6.5 times higher than that in 0.1 M KOH. Adding NaNO3 as a supporting electrolyte, which is found to be inert for long-term stability, complicates the electrocatalytic reaction in a half cell. The nonspecially adsorbed Na+ in the outer compact interfacial layer is suggested to form a stronger noncovalent interaction with OH- through hydrogen bond than adsorbed K+, leading to the decrease of interfacial OH- mobility. This hypothesis highlights the importance of outer-sphere adsorption for the OER, which is generally recognized as a pure inner-sphere process. Meanwhile, based on our experimental observations, the pseudocapacitive behavior of solid-state redox might be more reliable in quantifying active sites for OER than that measured from the conventional EDL charging capacitive process. The interfacial oxygen transport is observed to improve with increasing electrolyte conductivity, ascribing to the increased accessible active sites. The durability results in a liquid alkaline electrolyzer which shows that adding NaNO3 into KOH solution leads to additional degradation of OER activity and long-term stability. These findings provide an improved understanding of the mechanistic details and structural motifs required for efficient and robust electrocatalysis.
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Affiliation(s)
- Guang-Fu Li
- Department of Mechanical Engineering , University of California Merced , California 95343 , United States
| | - Maricor Divinagracia
- Department of Mechanical Engineering , University of California Merced , California 95343 , United States
- Department of Chemical Engineering, College of Engineering , University of the Philippines Diliman , Quezon City 1101 , Philippines
| | - Marc Francis Labata
- Environmental Systems Graduate Program , University of California , Merced 94343 , California , United States
| | - Joey D Ocon
- Department of Chemical Engineering, College of Engineering , University of the Philippines Diliman , Quezon City 1101 , Philippines
| | - Po-Ya Abel Chuang
- Department of Mechanical Engineering , University of California Merced , California 95343 , United States
- Environmental Systems Graduate Program , University of California , Merced 94343 , California , United States
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Su X, Gao L, Hu L, Qaisrani NA, Yan X, Zhang W, Jiang X, Ruan X, He G. Novel piperidinium functionalized anionic membrane for alkaline polymer electrolysis with excellent electrochemical properties. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2019.03.072] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Hu A, Pang Q, Tang C, Bao J, Liu H, Ba K, Xie S, Chen J, Chen J, Yue Y, Tang Y, Li Q, Sun Z. Epitaxial Growth and Integration of Insulating Metal–Organic Frameworks in Electrochemistry. J Am Chem Soc 2019; 141:11322-11327. [DOI: 10.1021/jacs.9b05869] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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