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Enhancing Electrochemical CO 2 Reduction using Ce(Mn,Fe)O 2 with La(Sr)Cr(Mn)O 3 Cathode for High‐Temperature Solid Oxide Electrolysis Cells
Author(s) -
Lee Seokhee,
Kim Minkyu,
Lee Kang Taek,
Irvine John T. S.,
Shin Tae Ho
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202100339
Subject(s) - electrolysis , materials science , oxide , cathode , electrochemistry , electrode , inorganic chemistry , electrocatalyst , chemical engineering , metallurgy , electrolyte , chemistry , engineering
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)O 3 (LSCM)‐based oxide cathodes have shown promise as durable ceramic cathodes; however, they suffer from low electrocatalytic activities in electrochemical CO 2 reduction. In this study, a dual‐phase composite electrode consisting of LSCM and Ce(Mn, Fe)O 2 (CMF) is developed to enhance the electrocatalytic activity of CO 2 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 CO 2 adsorption and results in the subsequent dissociation of the carbonate intermediate in the CO 2 reduction.