Exploring MnCr_2O_4-Gd_(0.1)Ce_(0.9)O_(2-δ) as a composite electrode material for solid oxide fuel cell

摘要

Symmetrical solid oxide fuel cell (SOFC) adopting the same material at both electrodes is potentially capable of promoting thermomechanical compatibility between near components and lowering stack costs. In this paper, MnCr2O4-Gd0.1Ce0.9O2-delta (MCO-GDC) composite electrodes prepared by co-infiltration method for symmetrical electrolyte supported and anode supported solid oxide fuel cells are evaluated at a temperature range of 650 -800 degrees C in wet (3% H2O) hydrogen and air atmospheres. Without any alkaline earth elements and cobalt, the co-infiltrated MCO-GDC composite electrode shows excellent activity for oxygen reduction reaction but mediocre activity for hydrogen oxidation reaction. With MCO-GDC as the cathode, the Ni-YSZ (Y2O3 stabilized ZrO2) anode supported asymmetrical cell demonstrates a peak power density of 665 mW cm(-2) at 800 degrees C. The above results suggest MCO-GDC is a promising candidate cathode material for solid oxide fuel cells. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.