Study of CO_2 and H_2O direct co-electrolysis in an electrolyte-supported solid oxide electrolysis cell by aqueous tape casting technique

摘要

High temperature co-electrolysis based on Solid Oxide Electrolysis Cell (SOEC) is a very promising method to produce sustainable fuels and reduce greenhouse emissions. In this paper, the electrolyte-supported LSCM-GDC/SSZ/LSCF-GDC (LSCM: La0.75Sr0.25Cr0.5Mn0.5-O3+delta single cells are prepared and evaluated for high temperature steam and carbon di- oxide direct co-electrolysis. And the fabrication of electrolyte layer is used with aqueous tape casting technique, which contributes to form a flat electrolyte layer with lower ohmic resistance in an eco-friendly way. LSCM fuel electrode exhibits good properties of redox stability and catalytic performance. During the experiment, different temperatures and volume ratios of H2O/CO2 are introduced into the cell to evaluate the electrochemical performance. In order to further verify the long-term performance of the cell, durability constant current SOEC test is carried out and the cell showed a stable voltage of 1.5 V for more than 100 h and throughout the duration of co-electrolysis. The results show that the electrolyte-supported SOEC using aqueous tape casting technique has good electrochemical performance and stability. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.