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Enhancing electrochemical CO2 reduction using Ce(Mn,Fe)O2 with La(Sr)Cr(Mn)O3 cathode for high-temperature solid oxide electrolysis cells

Research output: Contribution to journalArticlepeer-review

Author(s)

Seokhee Lee, Minkyu Kim, Kang Taek Lee, John T. S. Irvine, Tae Ho Shin

School/Research organisations

Abstract

Robust oxide electrodes with high activity and durability have attracted significant attention as alternatives for Ni‐based cathodes in high‐temperature solid oxide electrolysis cells (SOECs). Noncoking La(Sr)Cr(Mn)O3 (LSCM)‐based oxide cathodes have shown promise as durable ceramic cathodes; however, they suffer from low electrocatalytic activities in electrochemical CO2 reduction. In this study, a dual‐phase composite electrode consisting of LSCM and Ce(Mn, Fe)O2 (CMF) is developed to enhance the electrocatalytic activity of CO2 reduction in SOECs. The developed electrode shows excellent electrolysis performance of 2.64 and 1.22 A cm–2 at 1123 K, when voltages of 1.5 and 1.2 V are applied, respectively, without using any precious metal catalysts. The enhanced electrolysis performance is attributed to increases in electrocatalytic activity and surface oxygen vacancies caused by the CMF, which accelerates CO2 adsorption and results in the subsequent dissociation of the carbonate intermediate in the CO2 reduction.


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Details

Original languageEnglish
Article number2100339
Number of pages12
JournalAdvanced Energy Materials
VolumeEarly View
Early online date12 May 2021
DOIs
Publication statusE-pub ahead of print - 12 May 2021

    Research areas

  • Ce(Mn, Fe)O2, Composite oxide, Fuel electrodes, La(Sr)Cr(Mn)O3, Solid oxide electrolysis cells

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