Properties of LSCM-GDC Composite Cathode Impregnatedwith Ni and Cu

Abstract

Abstract: Solid oxide electrolysis cell can cleanly and efficiently convert electric and thermal energy into chemical energy, which has broad application prospects in the new energy field. La_0.75Sr_0.25Cr_0.5Mn_0.5O_3-δ (LSCM) has high temperature stability and is one of hotspots in the research of solid oxide electrolysis cell cathode materials. However, the relatively low ionic conductivity of LSCM results in insufficient electrocatalytic performance during electrolysis. In this paper, Ce_0.8Gd_0.2O_2-δ (GDC) with high ionic conductivity was composited on the basis of LSCM to construct a composite electrode, and Ni and Cu were impregnated into the composite electrode as metal catalysts to improve the water vapor adsorption and conversion capacity of the electrode. Ni, Cu co-loaded can keep single Ni or Cu loaded at the same time to improve the electrode electrolysis mechanism. The results show that compared with single Ni or Cu impregnation cathodes, the electrode with Ni and Cu co-impregnation has higher electrochemical performance under reducing atmosphere. The electrochemical performance of the electrode under reducing atmosphere at 800 ℃ is better than that under oxidizing atmosphere. The electrode with the nickel-copper mass ratio of 2∶8 has the best performance among the Ni, Cu-loaded cathodes, which current density reaches 2.36 A·cm^-2 at -0.1 V overpotential, and the polarization resistance is 0.92 Ω·cm².

Key words: solid oxide electrolysis cell, cathode material, LSCM, LSCM-GDC composite electrode, ionic conductivity, electrochemical performance, high temperature steam electrolysis, impregnation method

CLC Number:

TQ151

LIU Xinnan, XIAO Yanzhi, HUANG Meiqi, JIANG Han, KONG Jiangrong, ZHOU Tao. Properties of LSCM-GDC Composite Cathode Impregnatedwith Ni and Cu[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2458-2466.

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