journal article·2022-02-23

Mutual Conversion of CO–CO2 on a Perovskite Fuel Electrode with Endogenous Alloy Nanoparticles for Reversible Solid Oxide Cells

Yihang Li, Yanpu Li, Shaowei Zhang, Cong Ren, Yifu Jing, Fupeng Cheng, Qixing Wu, Peter Lund, Liangdong Fan

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Abstract

Reversible solid oxide cells (RSOCs) can efficiently render the mutual conversion between electricity and chemicals, for example, electrolyzing CO2 to CO under a solid oxide electrolysis cell (SOEC) mode and oxidizing CO to CO2 under a solid oxide fuel cell (SOFC) mode. Nevertheless, the development of RSOCs is still hindered, owing to the lack of catalytically active and carbon-tolerant fuel electrodes. For improving mutual CO–CO2 conversion kinetics in RSOCs, here, we demonstrate a high-performing and durable fuel electrode consisting of redox-stable Sr2(Fe, Mo)2O6−δ perovskite oxide and epitaxially endogenous NiFe alloy nanoparticles. The electrochemical impedance spectrum (EIS) and distribution of relaxation time (DRT) analyses reveal that surface/interface oxygen exchange kinetics and the CO/CO2 activation process are both greatly accelerated. The assembled single cell produces a maximum power density (MPD) of 443 mW cm–2 at 800 °C under the SOFC mode, with the corresponding CO oxidation rate of 5.524 mL min–1 cm–2. On the other hand, a current density of -0.877 A cm–2 is achieved at 1.46 V under the SOEC mode, equivalent to a CO2 reduction rate of 6.108 mL min cm–2. Furthermore, reliable reversible conversion of CO–CO2 is proven with no performance degradation in 20 cycles under SOEC (1.3 V) and SOFC (0.6 V) modes. Therefore, our work provides an alternative way for designing highly active and durable fuel electrodes for RSOC applications.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Electronic and Structural Properties of Oxides · Catalysis and Oxidation Reactions

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Interdisciplinary Research Center of Smart Sensors, Academy of Advanced Interdisciplinary Research, Xidian University, Xi’an 710071, P. R. China

College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, Guangdong, P. R. China

CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, No. 96 Jinzhai Road, Hefei 230026, Anhui, P. R. China

Department of Applied Chemistry, School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710071, P. R. China

New Energy Technologies Group, Department of Applied Physics, Aalto University School of Science, FI-00076 Aalto, Finland

Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China

Funding

Department of Education of Guangdong Province · Science and Technology Commission of Shanghai Municipality · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Nature Science Basic Research Plan in Shaanxi Province of China · Shenzhen Governmentâ??s Plan of Science and Technology

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