Ti-doped molybdenum-based perovskites as anodes for solid oxide fuel cells

Abstract Ti doping is found to increase the stability of Sr 2 NiMoO 6 perovskite oxides in reducing atmosphere. The composition Sr 2 TiNi 0.5 Mo 0.5 O 6 (STNM) is further evaluated as a potential oxide anode for solid oxide fuel cells (SOFCs). Electrical conductivity, thermal expansion coefficient, surface exchange coefficient, chemical diffusion coefficient, and its electrochemical performance in single cells with La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3− δ (LSGM) electrolytes are investigated. STNM exhibits a high conductivity of 17.5 S cm −1 at 800 °C at anodic atmosphere. The material shows good chemical and thermal expansion compatibilities with LSGM. To investigate the effect of Ti doping on the conduction properties, first-principle calculations are performed using the Vienna Ab initio Simulation. The strong Ti–O bond is held responsible for the enhanced structural stability of STNM under humidified H 2 atmospheres, relative to that of the undoped system. The remarkable cell performance with both H 2 and dry CH 4 as the fuel indicates the potential ability of STNM to be used as SOFC anodes. These results obtained indicate that Sr 2 TiNi 0.5 Mo 0.5 O 6 is a promising material for use as anode for intermediate temperature SOFCs.