Enhancing cathode performance for CO2 electrolysis with Ce0.9M0.1O2-δ（M=Fe, Co, Ni） catalysts in solid oxide electrolysis cell  

作　　者：Zhidong Huang Zhe Zhao Huiying Qi Xiuling Wang Baofeng Tu Mojie Cheng 

机构地区：[1]Division of Fuel Cells,Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Energy Chemistry》2020年第1期46-51,I0003,共7页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 91534128, 21506208 and 21476230);the Ministry of Science and Technology of China (Grants 2016YFE0118300);the DNL Cooperation Fund, CAS (DNL180306)

摘　　要：Electrochemical conversion with solid oxide electrolysis cells is a promising technology for CO2 utilization and simultaneously store renewable energy.In this work,Ce0.9M0.1O2-δ(CeM,M=Fe,Co,Ni)catalysts are infiltrated into La0.6Sr0.4Cr0.5Fe0.5O3-δ-Gd0.2Ce0.8O2-δ(LSCr Fe-GDC)cathode to enhance the electrochemical performance for CO2 electrolysis.CeCo-LSCrFe-GDC cell obtains the best performance with a current density of 0.652 A cm^-2,followed by CeFe-LSCrFe-GDC and CeNi-LSCrFe-GDC cells with the value of 0.603 and 0.535 A cm^-2,respectively,about 2.44,2.26 and 2.01 times higher than that of the LSCrFe-GDC cell at1.5 V and 800℃.Electrochemical impedance spectra combined with distributions of relaxed times analysis shows that both CO2 adsorption process and the dissociation of CO2 at triple phase boundaries are accelerated by Ce M catalysts,while the latter is the key rate-determining step.Electrochemical conversion with solid oxide electrolysis cells is a promising technology for CO2 utilization and simultaneously store renewable energy. In this work, Ce0.9M0.1O2-δ（CeM, M=Fe, Co, Ni） catalysts are infiltrated into La0.6 Sr0.4 Cr(0.5 Fe0.5 O3-δ–Gd0.2 Ce0.8 O2-δ（LSCr Fe-GDC） cathode to enhance the electrochemical performance for CO2 electrolysis. Ce Co-LSCr Fe-GDC cell obtains the best performance with a current density of 0.652 A cm-2, followed by Ce Fe-LSCr Fe-GDC and Ce Ni-LSCr Fe-GDC cells with the value of 0.603 and 0.535 A cm-2, respectively, about 2.44, 2.26 and 2.01 times higher than that of the LSCr Fe-GDC cell at1.5 V and 800 °C. Electrochemical impedance spectra combined with distributions of relaxed times analysis shows that both CO2 adsorption process and the dissociation of CO2 at triple phase boundaries are accelerated by Ce M catalysts, while the latter is the key rate-determining step.

关 键 词：Solid oxide electrolysis cell Carbon dioxide conversion Doped ceria Distribution of relaxation times ELECTROREDUCTION 

分 类 号：O643.36[理学—物理化学] TM912[理学—化学]