Issue 5, 2022

Layered-perovskite oxides with in situ exsolved Co–Fe alloy nanoparticles as highly efficient electrodes for high-temperature carbon dioxide electrolysis

Abstract

Carbon dioxide (CO2) reduction using solid oxide electrolysis cells (SOECs) has attracted great attention because of the high efficiency and fast kinetics enabled by high operating temperatures. Electrode materials with high catalytic activity for CO2 reduction and good stability over long-term operation, nevertheless, are still to be developed. In this work, layered-perovskite oxide electrodes with in situ exsolved Co–Fe alloy nanoparticles are developed for efficient CO2 electrolysis to produce carbon monoxide (CO). Using double perovskite oxide Sr2Ti0.8Co0.2FeO6−δ as a solid precursor, a Ruddlesden–Popper phase oxide matrix with exsolved Co–Fe alloy nanoparticles uniformly distributed on the surface (Co–Fe–STCF) is synthesized by thermal reduction. The cell with a mixture of Co–Fe–STCF and Sm0.2Ce0.8O2−δ (SDC) as the fuel electrode exhibits outstanding performance for CO2 electrolysis, with a polarization resistance (Rp) as low as 0.22 Ω cm2 at 800 °C. A current density of 1.26 A cm−2 is acquired at a bias of 1.6 V at 800 °C, and the CO production rate reached 8.75 mL min−1 cm−2 with a high value of Faraday efficiency (∼100%). Moreover, the Co–Fe–STCF–SDC electrode shows good stability for long-term (100 h) operation with no carbon deposition on the surface. Such high performance of the Co–Fe–STCF–SDC electrode is attributed to abundant oxygen vacancies in the oxide matrix and the high catalytic activity of the exsolved metal nanoparticles. The result of this work can guide the design of highly active and stable (electro)catalysts for high-temperature energy and environmental devices.

Graphical abstract: Layered-perovskite oxides with in situ exsolved Co–Fe alloy nanoparticles as highly efficient electrodes for high-temperature carbon dioxide electrolysis

Supplementary files

Article information

Article type
Paper
Submitted
24 aug 2021
Accepted
27 nov 2021
First published
29 nov 2021

J. Mater. Chem. A, 2022,10, 2327-2335

Layered-perovskite oxides with in situ exsolved Co–Fe alloy nanoparticles as highly efficient electrodes for high-temperature carbon dioxide electrolysis

X. Sun, Y. Ye, M. Zhou, H. Chen, Y. Li, P. Chen, D. Dong, Y. Ling, M. Khan and Y. Chen, J. Mater. Chem. A, 2022, 10, 2327 DOI: 10.1039/D1TA07251J

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