Electrical conductivity and cell performance of La_(0.3)Sr_(0.7)Ti_(1-x)Cr_xO_(3-δ) perovskite oxides used as anode and interconnect material for SOFCs

摘要

The anode materials La_(0.3)Sr_(0.7)Ti_(1-x)Cr_xO_(3-δ) (LSTC, x = 0, 0.1, 0.2) with cubic structure were prepared via solid state reaction route. The influence of Cr content on the properties of LSTC as anode and interconnect materials for solid oxide fuel cells (SOFCs) was investigated. The Cr-doping decreased the lattice parameter while increased the sinterability of LSTC materials. The total electrical conductivity decreased with Cr doping level, from 230 S cm~(-1) for x = 0 to 53 S cm~(-1) for x = 0.2. The total electrical conductivity exhibited good stability and recoverability in alternative atmospheres of air and 5% H_2/Ar, showing excellent redox stability. The cell testing showed that the anode performance of LSTC was enhanced somewhat by Cr doping. The present results indicated that the prepared La_(0.3)Sr_(0.7)Ti_(1-x)Cr_xO_(3-δ) can be potential anode and interconnect materials for SOFCs.