Electrochemical Performance and Reaction Mechanism of LaNi_(0.6)Fe_(0.4)O_(3-δ) -Ce_(0.9)Gd_(0.1)O_(1.95) Composite Electrode for Solid Oxide Fuel Cell

摘要

Mixed conducting LaNi_(0.6)Fe_(0.4)O_(3-δ) electrode was combined with an ionically conducting oxide Ce_(0.9)Gd_(0.1)O_(1.95), which resulted in high area specific conductivity (ASC). The enhancement of ASC did not only depend on their volume ratio but depended on sintering temperatures as well. Besides the extension of triple phase boundary, the catalytic activity itself could also be enhanced at the junction of the two oxides. This was proven with a LaNi_(0.6)Fe_(0.4)O_(3-δ) film electrode coated with a Ce_(0.9)Gd_(0.1)O_(1.95) porous layer on the top. It showed higher ASC compared to the bare LaNi_(0.6)Fe_(0.4)O_(3-δ) film electrode.