Perovskite LSCM impregnated with vanadium pentoxide for high temperature carbon dioxide electrolysis

摘要

Perovskite La0.75Sr0.25Cr0.5Mn0.5O3-(delta) ( LSCM) has been used as a typical cathode for CO2 electrolysis in oxide-ion conducting solid oxide electrolyzers; however, the limited electrocatalytic activity still restricts electrode kinetic process. In this work, catalytic-active V2O5 nanocatalyst is impregnated in LSCM cathode to enhance electrocatalytic performance. Electrochemical measurements show that the loading of 2 wt% V2O5 significantly improves electrode activity and accordingly reduces electrode polarization resistance from 2.6 Omega.cm(2) for LSCM to 1.2 Omega.Cm-2 for V2O5-LSCM in pure hydrogen. The current densities and Faradic efficiencies with V2O5-LSCM electrode are remarkably enhanced by 30% and 40% in contrast to bare LSCM electrode in the voltage region of 1.2-2.0 V at 800 degrees C for direct carbon dioxide electrolysis, respectively. (C) 2016 Elsevier Ltd. All rights reserved.