Electrochemical properties of A-site deficient Sr_(0.9)Y_(0.08)Ti_(0.95)Ni_(0.05)O_(3-δ) as an active fuel electrode for solid oxide cells

摘要

A-site deficient Sr0.9Y0.08Ti0.95Ni0.05O3-delta (SYTN) is synthesized and applied as a highly active fuel electrode for reversible solid oxide cells (RSOCs). The as-prepared SYTN shows an n-type conduction mechanism and a high electrical conductivity of 19.7 S cm(-1). Based on the density functional theory calculations, it is found that a stronger hybridization of Ni-d and O-p orbit. The exsolved nanoparticles with the perovskite supporter show high catalytic activity. The SYTN anode presents a low Rp of 0.36 52 cm(2) at 800 degrees C in 5% H-2/N-2. A single cell with SYTN anode and a 170 gm thick Sc2O3 stabilized-ZrO2 electrolyte layer exhibits maximum power densities of 873 and 412 mW cm(2) at 800 degrees C using humidified H-2 and CH4 as fuels respectively. (c) 2020 Elsevier B.V. All rights reserved.