B-Site Doping and Catalytic Activity of Sr(Y)TiO[sub 3]

Abstract

Doped SrTiO3 is a potential anode for intermediate and high temperature solid oxide fuel cells, but by itself has limited catalytic activity for the hydrogen oxidation reaction. Its catalytic performance is, however, improved by Ni infiltration. The anode polarization is determined over a range of gas compositions of B-site co-doped Sr0.88Y0.08Ti0.95M0.05O3−delta (SYTMO where M represents the B-site dopants) for sparsely Ni-infiltrated SYTMO. Co and Cr were selected as the B-site dopants and compared with undoped SYTO based on their differing reducibility. All anodes also were subjected to a 12 h reduction/oxidation cycle. While Cr-doped anodes showed the best resistance to oxidation, the Co-doped system exhibited the lowest anode polarization resistance under all conditions. It was found that H transport is the slowest step for all anodes, which could be partly attributed to sparsity of the infiltrated Ni catalyst.