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Summerer H, Rath K, Nenning A, Schachinger T, Stöger-Pollach M, Rameshan C, Opitz AK. Electro-tuned catalysts: voltage-controlled activity selection of bimetallic exsolution particles. JOURNAL OF MATERIALS CHEMISTRY. A 2024; 12:20386-20402. [PMID: 39114766 PMCID: PMC11304079 DOI: 10.1039/d4ta00989d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 07/02/2024] [Indexed: 08/10/2024]
Abstract
In this work, we show how the activity states of bimetallic Ni0-Fe0 catalysts exsolved from Nd0.6Ca0.4Fe0.97Ni0.03O3-δ (NCFNi) can be influenced electrochemically. The NCFNi parent oxide was employed in the form of thin film mixed conducting model electrodes, which were operated in a humid hydrogen atmosphere. By precisely controlling the oxygen chemical potential in the parent oxide electrode via applying an electrochemical polarisation, we managed to selectively exsolve Ni nanoparticles from the perovskite lattice and study their catalytic activity switching characteristics. To be able to track the surface chemical changes during the switching process, electrochemical polarisation experiments were combined with near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) measurements. This in situ analytical approach allowed relating the difference we observed in the switching behaviour of Ni particles here and of Fe particles in a recent study, to a different kinetic interplay between electrochemical driving force and atmosphere. We propose that slow oxygen transport through nickel oxide, located at the particle/perovskite interface, is mainly responsible for the observed difference to iron exsolutions, which becomes especially evident for larger nickel particles. In addition, in the case of bimetallic exsolutions and with applied bias voltage as a control parameter, we are able to reversibly switch between three different activity states, namely bimetallic Ni0-Fe0 (medium activity), pure Ni0 (high activity), and the inactive oxides.
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Affiliation(s)
- Harald Summerer
- Institute of Chemical Technologies and Analytics, TU Wien Getreidemarkt 9/164-EC 1060 Vienna Austria
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/165-PC 1060 Vienna Austria
| | - Kirsten Rath
- Institute of Chemical Technologies and Analytics, TU Wien Getreidemarkt 9/164-EC 1060 Vienna Austria
| | - Andreas Nenning
- Institute of Chemical Technologies and Analytics, TU Wien Getreidemarkt 9/164-EC 1060 Vienna Austria
| | - Thomas Schachinger
- Institute of Solid State Physics, TU Wien 1040 Vienna Austria
- University Service Centre for Transmission Electron Microscopy, TU Wien 1040 Vienna Austria
| | - Michael Stöger-Pollach
- Institute of Solid State Physics, TU Wien 1040 Vienna Austria
- University Service Centre for Transmission Electron Microscopy, TU Wien 1040 Vienna Austria
| | - Christoph Rameshan
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/165-PC 1060 Vienna Austria
- Chair of Physical Chemistry, Montanuniversity Leoben Leoben 8700 Austria
| | - Alexander K Opitz
- Institute of Chemical Technologies and Analytics, TU Wien Getreidemarkt 9/164-EC 1060 Vienna Austria
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2
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Zhu K, Zhang L, Shi N, Qiu B, Hu X, Huan D, Xia C, Peng R, Lu Y. A Superior Catalytic Air Electrode with Temperature-Induced Exsolution toward Protonic Ceramic Cells. ACS NANO 2024. [PMID: 38285914 DOI: 10.1021/acsnano.3c12609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2024]
Abstract
Protonic ceramic cells merit extensive exploration, attributed to their innate capabilities for potent and environmentally benign energy conversion. In this work, a temperature-induced exsolution methodology to synthesize SrCo0.5Nb0.5O3-δ (SCN) nanoparticles (NPs) with notably elevated activity on the surface of PrSrCo1.8Nb0.2O6-δ (PSCN) is proposed, directly addressing the extant challenge of restrained catalytic activity prevalent in air electrode materials. In situ assessments reveal that SCN NPs commence exsolution from the matrix at temperatures surpassing 900 °C during straightforward calcination processes and maintain stability throughout annealing. Notably, the resultant SCN-PSCN interface facilitates vapor adsorption and protonation processes, which are poised to enhance surface reaction kinetics pertaining to the proton-involved oxygen reduction and evolution reaction (P-ORR and P-OER). A fuel-electrode-supported protonic ceramic cell leveraging SCN-PSCN as the air electrode manifests compelling performance, attaining a peak power density of 1.30 W·cm-2 in the fuel cell modality and a current density of 1.91 A·cm-2 at 1.3 V in the electrolysis mode, recorded at 650 °C. Furthermore, density functional theory calculations validate that the introduction of SCN NPs onto the PSCN surface conspicuously accelerates electrode reaction rates correlated with P-ORR and P-OER, by significantly mitigating energy barriers associated with surface oxygen and vapor dissociation.
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Affiliation(s)
- Kang Zhu
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Lijie Zhang
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Nai Shi
- INAMORI Frontier Research Center, Kyushu University, 744 Motooka, Nishiku, Fukuoka 819-0395, Japan
| | - Bingbing Qiu
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Xueyu Hu
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
| | - Daoming Huan
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Changrong Xia
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Ranran Peng
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Yalin Lu
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
- Hefei National Laboratory of Physical Science at the Micro-scale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
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Summerer H, Nenning A, Rameshan C, Opitz AK. Exsolved catalyst particles as a plaything of atmosphere and electrochemistry. EES CATALYSIS 2023; 1:274-289. [PMID: 37213935 PMCID: PMC10193834 DOI: 10.1039/d2ey00036a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 03/20/2023] [Indexed: 05/23/2023]
Abstract
A new type of catalyst preparation yields its active sites not by infiltration but exsolution of reducible transition metals of its own host lattice. These exsolution catalysts offer a high dispersion of catalytically active particles, slow agglomeration, and the possibility of reactivation after poisoning due to redox cycling. The formation of exsolved particles by partial decomposition of the host lattice can be driven by applying a sufficiently reducing atmosphere, elevated temperatures but also by a cathodic bias voltage (provided the host perovskite is an electrode on an oxide ion conducting electrolyte). In addition, such an electrochemical polarisation can change the oxidation state and thus the catalytic activity of exsolved particles. In this work, we investigate the electrochemical switching between an active and an inactive state of iron particles exsolved from thin film mixed conducting model electrodes, namely La0.6Sr0.4FeO3-δ (LSF) and Nd0.6Ca0.4FeO3-δ (NCF), in humid hydrogen atmospheres. We show that the transition between two activity states exhibits a hysteresis-like behaviour in the electrochemical I-V characteristics. Ambient pressure XPS measurements proofed that this hysteresis is linked to the oxidation and reduction of iron particles. Furthermore, it is demonstrated that the surface kinetics of the host material itself has only a negligible impact on the particle exsolution, and that the main impact factors are the surrounding atmosphere as well as the applied electrochemical overpotential. In particular, we suggest a 'kinetic competition' between gas atmosphere and oxygen chemical potential in the mixed conducting electrode and discuss possible ways of how this process takes place.
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Affiliation(s)
- Harald Summerer
- TU Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-EC 1060 Vienna Austria
- TU Wien, Institute of Materials Chemistry, Getreidemarkt 9/165-PC 1060 Vienna Austria
| | - Andreas Nenning
- TU Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-EC 1060 Vienna Austria
| | - Christoph Rameshan
- TU Wien, Institute of Materials Chemistry, Getreidemarkt 9/165-PC 1060 Vienna Austria
| | - Alexander K Opitz
- TU Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-EC 1060 Vienna Austria
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Simonenko TL, Simonenko NP, Simonenko EP, Kuznetsov NT. Features of Glycol-Citrate Synthesis of Highly Dispersed Oxide La0.6Sr0.4Co0.2Fe0.8O3 – δ. RUSS J INORG CHEM+ 2022. [DOI: 10.1134/s0036023622600939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zhang L, Ji W, Guo Q, Cheng Y, Liu X, Lu H, Dai H. Probing into the In-Situ Exsolution Mechanism of Metal Nanoparticles from Doped Ceria Host. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2114. [PMID: 34443943 PMCID: PMC8398560 DOI: 10.3390/nano11082114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/16/2021] [Accepted: 08/18/2021] [Indexed: 11/16/2022]
Abstract
Exsolved nanoparticle catalysts have recently attracted broad research interest as they simultaneously combine the features of catalytic activity and chemical stability in various applications of energy conversion and storage. As the internal mechanism of in-situ exsolution is of prime significance for the optimization of its strategy, comprehensive research focused on the behaviors of in-situ segregation for metal (Mn, Fe, Co, Ni, Cu, Ag, Pt and Au)-substituted CeO2 is reported using first-principles calculations. An interesting link between the behaviors of metal growth from the ceria host and their microelectronic reconfigurations was established to understand the inherent attribute of metal self-regeneration, where a stair-stepping charge difference served as the inner driving force existing along the exsolving pathway, and the weak metal-coordinate associations synergistically facilitate the ceria's in-situ growth. We hope that these new insights provide a microscopic insight into the physics of in-situ exsolution to gain a guideline for the design of nanoparticle socketed catalysts from bottom to top.
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Affiliation(s)
- Lifang Zhang
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
| | - Weiwei Ji
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
| | - Qiyang Guo
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
| | - Yu Cheng
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
| | - Xiaojuan Liu
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
- University of Science and Technology of China, Hefei 230026, China
| | - Hongbin Lu
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
| | - Hong Dai
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226009, China; (L.Z.); (W.J.); (Q.G.)
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Wang H, Zhang W, Meng J, Pei Y, Qiu X, Meng F, Liu X. Effectively Promoting Activity and Stability of a MnCo 2O 4-Based Cathode by In Situ Constructed Heterointerfaces for Solid Oxide Fuel Cells. ACS APPLIED MATERIALS & INTERFACES 2021; 13:24329-24340. [PMID: 33978394 DOI: 10.1021/acsami.1c06757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The development of multiphase composite electrocatalysts plays a key role in achieving the efficient and durable operation of intermediate-temperature solid oxide fuel cells (IT-SOFCs). Herein, a self-assembled nanocomposite is developed as the oxygen reduction reaction (ORR) catalyst for IT-SOFCs through a coprecipitation method. The nanocomposite is composed of a doped (Mn0.6Mg0.4)0.8Sc0.2Co2O4 (MMSCO) spinel oxide (84 wt %), an orthorhombic perovskite phase (11.3 wt %, the spontaneous combination of PrO2 additives and spinel), and a minor Sc2O3 phase (4.7 wt %). The surface of the (Mn0.6Mg0.4)0.8Sc0.2Co2O4 phase is activated by the self-assembled nanocoating with many heterogeneous interfaces. Thence, the ORR kinetics is obviously accelerated and an area-specific resistance (ASR) of ∼0.11 Ω cm2 is obtained at 750 °C. Moreover, a single cell with the cathode shows a peak power density (PPD) of 1144.1 mW cm-2 at 750 °C, much higher than that of the cell with the MnCo2O4 cathode (456.2 mW cm-2). An enhanced stability of ∼120 h (0.8 A cm-2, 750 °C) is also achieved, related to the reduced thermal expansion coefficient (13.9 × 10-6 K-1). The improvement in ORR kinetics and stability can be attributed to the refinement of grains, the formation of heterointerfaces, and the enhancement of mechanical compatibility.
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Affiliation(s)
- Haocong Wang
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Wenwen Zhang
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Junling Meng
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Yongli Pei
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China
| | - Xin Qiu
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Fanzhi Meng
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China
| | - Xiaojuan Liu
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- University of Science and Technology of China, Hefei 230026, Anhui, China
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7
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Tang C, Kousi K, Neagu D, Metcalfe IS. Trends and Prospects of Bimetallic Exsolution. Chemistry 2021; 27:6666-6675. [PMID: 33428232 PMCID: PMC8248339 DOI: 10.1002/chem.202004950] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 01/08/2021] [Indexed: 11/15/2022]
Abstract
Supported bimetallic nanoparticles used for various chemical transformations appear to be more appealing than their monometallic counterparts, because of their unique properties mainly originating from the synergistic effects between the two different metals. Exsolution, a relatively new preparation method for supported nanoparticles, has earned increasing attention for bimetallic systems in the past decade, not only due to the high stability of the resulting nanoparticles but also for the potential to control key particle properties (size, composition, structure, morphology, etc.). In this review, we summarize the trends and advances on exsolution of bimetallic systems and provide prospects for future studies in this field.
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Affiliation(s)
- Chenyang Tang
- School of Engineering.Newcastle UniversityNewcastle upon TyneNE1 7RUUK
| | - Kalliopi Kousi
- School of Engineering.Newcastle UniversityNewcastle upon TyneNE1 7RUUK
| | - Dragos Neagu
- Department of Process and Chemical EngineeringUniversity of StrathclydeGlasgowG1 1XLUK
| | - Ian S. Metcalfe
- School of Engineering.Newcastle UniversityNewcastle upon TyneNE1 7RUUK
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8
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Fan L, Wang J, Huang Z, Yao X, Hou N, Gan T, Gan J, Zhao Y, Li Y. Enhancement of the electrocatalytic activity of La0.6Sr0.4Co0.2Fe0.8O3-δ through surface modification by acid etching. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.11.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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9
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Sun X, Chen H, Yin Y, Curnan MT, Han JW, Chen Y, Ma Z. Progress of Exsolved Metal Nanoparticles on Oxides as High Performance (Electro)Catalysts for the Conversion of Small Molecules. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2005383. [PMID: 33538089 DOI: 10.1002/smll.202005383] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 10/13/2020] [Indexed: 06/12/2023]
Abstract
Utilizing electricity and heat from renewable energy to convert small molecules into value-added chemicals through electro/thermal catalytic processes has enormous socioeconomic and environmental benefits. However, the lack of catalysts with high activity, good long-term stability, and low cost strongly inhibits the practical implementation of these processes. Oxides with exsolved metal nanoparticles have recently been emerging as promising catalysts with outstanding activity and stability for the conversion of small molecules, which provides new possibilities for application of the processes. In this review, it starts with an introduction on the mechanism of exsolution, discussing representative exsolution materials, the impacts of intrinsic material properties and external environmental conditions on the exsolution behavior, and the driving forces for exsolution. The performances of exsolution materials in various reactions, such as alkane reforming reaction, carbon monoxide oxidation, carbon dioxide utilization, high temperature steam electrolysis, and low temperature electrocatalysis, are then summarized. Finally, the challenges and future perspectives for the development of exsolution materials as high-performance catalysts are discussed.
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Affiliation(s)
- Xiang Sun
- School of Environment and Energy, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510006, P. R. China
| | - Huijun Chen
- School of Environment and Energy, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510006, P. R. China
| | - Yimei Yin
- Institute of Electrochemical & Energy Technology, Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Matthew T Curnan
- Department of Chemical Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 37673, Korea
| | - Jeong Woo Han
- Department of Chemical Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 37673, Korea
| | - Yan Chen
- School of Environment and Energy, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510006, P. R. China
| | - Zifeng Ma
- Institute of Electrochemical & Energy Technology, Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
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Meng X, Wang Y, Zhao Y, Zhang T, Yu N, Chen X, Miao M, Liu T. In-situ exsolution of nanoparticles from Ni substituted Sr2Fe1.5Mo0.5O6 perovskite oxides with different Ni doping contents. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136351] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Zhang W, Wang H, Guan K, Meng J, Wei Z, Liu X, Meng J. Enhanced Anode Performance and Coking Resistance by In Situ Exsolved Multiple-Twinned Co-Fe Nanoparticles for Solid Oxide Fuel Cells. ACS APPLIED MATERIALS & INTERFACES 2020; 12:461-473. [PMID: 31841308 DOI: 10.1021/acsami.9b14655] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The broad and large-scale application of solid oxide fuel cells (SOFCs) technology hinges significantly on the development of highly active and robust electrode materials. Here, Ni-free anode materials decorated with metal nanoparticles are synthesized by in situ reduction of Fe-doping Sr2CoMo1-xFexO6-δ (x = 0, 0.05, 0.1) double perovskite oxides under a reducing condition at 850 °C. The exsolved nanoparticles from the Sr2CoMo0.95Fe0.05O6-δ (SCMF0.05) lattice are Co-Fe alloys with rich multiple-twinned defects, significantly enhancing the catalytic activity of the SCMF0.05 anode toward the oxidation of H2 and CH4. The electrolyte-supported single cell with the reuduced SCMF0.05 anode reaches peak power densities as high as 992.9 and 652.3 mW cm-2 in H2 and CH4 at 850 °C, respectively, while maintaining superior stability (∼50 h at 700 °C). The reduced SCMF0.05 anode also demonstrates excellent coking resistance in CH4, which can be attributed to the increased oxygen vacancies due to Fe doping and the effective catalysis of multiple-twinned Co-Fe alloy nanoparticles for reforming of CH4 to H2 and CO. The findings in this work may provide a new insight for the design of highly active and durable anode catalysts in SOFCs.
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Affiliation(s)
- Wenwen Zhang
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , P. R. China
- University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
| | - Haocong Wang
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , P. R. China
- University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
| | - Kai Guan
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , P. R. China
- University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
| | - Junling Meng
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , P. R. China
| | - Zhenye Wei
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , P. R. China
- University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
| | - Xiaojuan Liu
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , P. R. China
- University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
| | - Jian Meng
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , P. R. China
- University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
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Zhang W, Wang H, Guan K, Wei Z, Zhang X, Meng J, Liu X, Meng J. La 0.6Sr 0.4Co 0.2Fe 0.8O 3-δ/CeO 2 Heterostructured Composite Nanofibers as a Highly Active and Robust Cathode Catalyst for Solid Oxide Fuel Cells. ACS APPLIED MATERIALS & INTERFACES 2019; 11:26830-26841. [PMID: 31268289 DOI: 10.1021/acsami.9b06668] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The lack of highly active and robust catalysts for the oxygen reduction reaction (ORR) at the intermediate temperatures significantly hinders the commercialization of solid oxide fuel cells (SOFCs). Here, we report a novel heterostructured composite nanofiber cathode composed of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) and CeO2 nanoparticles, synthesized by using a coaxial electrospinning technique, which exhibits remarkably enhanced ORR activity and durability as compared to single LSCF powder and nanofibers. This cathode achieves a polarization resistance of 0.031 Ω cm2 at 700 °C, approximately 1/5 of that for the LSCF powder cathode (0.158 Ω cm2). Such enhancement can be attributed to the continuous paths provided by nanofibers for efficient mass/charge transport and the interdiffusion of La and Ce at the heterointerface which leads to more oxygen vacancy formation. Furthermore, the anode-supported cell with the LSCF/CeO2 composite cathode shows excellent stability (0.4 V for ∼200 h at 600 °C) because of suppression of Sr segregation in LSCF by introducing CeO2 and the structure of heterogeneous nanofibers. These results indicate that the microstructure design of this heterostructured composite nanofiber for LSCF/CeO2 is extremely effective for enhancing ORR activity and stability. This finding may provide a new strategy for the microstructure design of highly active and robust ORR catalysts in SOFCs.
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Affiliation(s)
- Wenwen Zhang
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , China
- University of Science and Technology of China , Hefei , Anhui 230026 , China
| | - Haocong Wang
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , China
- University of Science and Technology of China , Hefei , Anhui 230026 , China
| | - Kai Guan
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , China
- University of Science and Technology of China , Hefei , Anhui 230026 , China
| | - Zhenye Wei
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , China
- University of Science and Technology of China , Hefei , Anhui 230026 , China
| | - Xiong Zhang
- Chongqing Vehicle Test & Research Institute Co., Ltd. , Chongqing 401120 , China
| | - Junling Meng
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , China
| | - Xiaojuan Liu
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , China
- University of Science and Technology of China , Hefei , Anhui 230026 , China
| | - Jian Meng
- State Key Laboratory of Rare Earth Resources Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , China
- University of Science and Technology of China , Hefei , Anhui 230026 , China
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Cao Z, Fan L, Zhang G, Shao K, He C, Zhang Q, Lv Z, Zhu B. Titanium-substituted ferrite perovskite: An excellent sulfur and coking tolerant anode catalyst for SOFCs. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.04.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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