La, Y and Nb Doped SrTiO₃ Anodes for Electrolyte Supported SOFC

Abstract

Single and bi-doped materials, viz. La, Y and Nb, present at both A and B sites of SrTiO 3 have been synthesized and tested as anode material in electrolyte supported SOFC. The cell performance of bi-doped anode material e.g., L 0.4 Y 0.2 Sr 0.4 TiO 3 (LYST) and La 0.4 Sr 0.6 Ti 0.9 Nb 0.1 O 3 (LSTN) was found to be higher than singledoped anode e.g., La 0.4 Sr 0.6 TiO 3 (LST) and SrTi 0.9 Nb 0.1 O 3 (STN). 20 wt % Ni-YSZ addition to LYST and LSTN increased the cell performance from 23 mW/cm 2 to 77 mW/cm 2 and 25 mW/cm 2 to 38 mW/cm 2 , respectively. LYST-Ni-YSZ anode gave the maximum power density, 70 mW/cm 2 , which was stable for 60 h of operation. Physical characterizations e.g., SEM, XRD and TEM of anode materials were investigated to correlate performance of different anodes.

Half-Cell Study of La and Ca Doped Strontium Titanates Anode for Direct Methane Solid Oxide Fuel Cell

“…Strontium titanate (SrTiO3) possesses desirable thermal and chemical stability and show mixed ionic and electronic conducting (MIEC) behavior at low oxygen partial pressure (10)(11)(12). It is shown that A-site deficiency enhances the electrical conductivity of La 3+ doped SrTiO3 (13)(14)(15). Ca doping lowers down the sintering temperature of LSTA-backbone and enhances the reducibility and electrical conductivity (13).…”

“…Ca doping lowers down the sintering temperature of LST A -backbone and enhances the reducibility and electrical conductivity (13). Catalytic activity of LSCT A-towards fuel oxidation has been improved by infiltration of transition metal and metal oxides such as Cu, Ni and CeO 2 (13,(16)(17).…”

La and Ca-Doped A-Site Deficient Strontium Titanates Anode for Electrolyte Supported Direct Methane Solid Oxide Fuel Cell

“…Doping at A-site or B-site in SrTiO 3 improves the electrical and ionic conductivity of the system. 16 It has been reported that reduced La 0.2 Sr 0.7 TiO 3 (LST A-) gives high electronic conductivity of 39.75 S cm −1 at 700 • C. 17 It may also be noted that lanthanum and yttrium-doped SrTiO 3 do not undergo solid state reactions with YSZ even after sintering at 1450 • C 18 and hence suitable to use as an anode with YSZ as the electrolyte.…”