Evaluation of Electrochemical Properties of LSCF Electrode with GDC Barrier Layer under both Fuel Cell and H_2O/CO_2 Co-electrolysis Modes

摘要

In this study, La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ) (LSCF) oxygen electrode as well as Gd_(0.1)Ce_(0.9)O_(2-δ) (GDC) barrier layer was employed by the screen printing process for both fuel cell and H_2O/CO_2 co-electrolysis operations. After initial performance evaluation of the cell under SOFC mode, electrochemical measurements of the cell were carried out at 700-800°C for co-electrolysis mode with 45% H_2O, 45% CO_2 and 10% H_2 as feed gas, Further, the long-term durability of the cell was examined at a constant current of 0.4 A*cm~(-2) for over 200 h. It showed that cell voltage held at a steady value after experiencing initial significant fluctuations.