Characterization of Y-doped SrTi_(1-x)V_xO_3 (Y = 0.1 and x = 0.1 and 0.2) Anodes for SOFCs

摘要

Substitution of vanadium at the B site of perovskite could be the potential solution to the limitation that Y-doped SrTiO_3 is currently facing. Y-doped SrTi_(1-x)V_xO_3 (Y=0.1 and x=0.1 and 0.2) were selected as the materials under this investigation and all measurements were carried out under normal atmospheric pressure. The experimental data shows that both samples exhibit tetragonal crystal structure with space group Ⅰ 4/m c m and satisfy anode requirement in terms of porosity. The TEC values reported for these materials are close to the TEC value of YSZ (10.8 × 10~(-6) K~(-1)). The measured electrical conductivity is in the order of 0.002 Scm~(-1) to 0.2042 Scm~(-1) between 600°C to 1000°C. TG analyses of the samples have shown significant weight loss for Sr_(0.9)Y_(0.1) Ti_(0.9) V_(0.1) O_3 while slight increase in weight was noted for Sr_(0.9)Y_(0.1)Ti_(0.8)V_(0.2) O_3. The measured zeta potential suggests that the materials are in the range of moderate stability to resist aggregation from colloidal suspension.