电解
材料科学
氧化物
阴极
极化(电化学)
化学工程
钙钛矿(结构)
无机化学
电极
冶金
化学
物理化学
电解质
工程类
作者
Yarong Wang,Cong Liu,Tenglong Zhu,Zhibin Yang,Chen Jin
标识
DOI:10.1016/j.ceramint.2023.07.017
摘要
Rational design of efficient and stable cathode materials is essential and important to directly and sustainably electrolyze CO2 into valuable chemical fuels of solid oxide electrolysis cell (SOEC). Herein, novel La0.75Sr0.25Cr0.5Mn0.4Fe0.1O3-δ/Fe2P heterointerfaces are in-situ tailored on the surface of La0.75Sr0.25Cr0.5Mn0.4Fe0.1O3-δ (LSCMF) cathodic skeleton for CO2 electrolysis. Benefitting from typical LSCMF/Fe2P heterointerfaces and additional oxygen vacancies, optimized CO2 adsorption, dissociation and electrolysis are obtained to boost electrolysis performances. As a proof, SOEC with the as-prepared r-LSCMF-P cathode delivers a current density of 866 mA cm−2 and a polarization resistance of 0.39 Ω cm2 at 800 °C and an applied voltage of 1.5 V, which demonstrates an over 2 times improvement of CO2 electrolysis performance compared to SOEC with the LSCMF cathode at the same condition. In addition, a lower attenuation rate of 0.43 mV h−1 could be observed for the SOEC after the direct CO2 electrolysis measurement up to 126 h. These results fully suggest that in-situ tailoring of LSCMF/Fe2P heterointerfaces is a feasible strategy to further improve activity of perovskite oxide for CO2 electrolysis.
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