Sr(Ti,Fe)O_3−δ Based Intermediate Temperature Solid Oxide Fuel Cell Anode with Self-precipitated (Ni,Fe) and Gd_0.1Ce_0.9O_2−δ Nano Particles

Abstract

We report an optimized Sr0.95Ti0.35Fe0.6Ni0.05O3−δ (STFN) anode in electrolyte supported single cell, which exhibits high stability and fine electrochemical catalytic activity in 3% H2O-97% H2 at 750 °C, with exsolved Ni0.4Fe0.6 nano particles and stoichiometric-close composition of AB0.924O3−δ after exsolution. In order to bring perovskite anode into application, mixtures of STFN and Gd0.1Ce0.9O1.95 (GDC), prepared by physical and sol-gel method, are applied as anode functional layer in electrolyte supported single cells. Further studies reveal that the composite anode prepared by adding GDC to STFN can improve anode performance at intermediate and low temperatures by decreasing anode polarization resistance ( R p , A ) dependence in diluted fuels. The sol-gel method is shown to effectively fabricate uniformly dispersed multi-phase anode, compared with STFN anode, with decreased R p , A of 0.089 Ω·cm2 for STFN@GDC anode at 750 °C and p H 2 = 0.97 atm . Moreover, the single cell also demonstrates good performance under both H2 and H2–CO.

Nanotechnologies in ceramic electrochemical cells

“…In another work, Chen et al investigated the phase evolution ehavior of Sr 0.95 Ti 0.35 Fe 0.6 Ni 0.05 O 3− δ (STFN) in 3% H 2 O–97% H 2 at 750 °C. 230 The in situ exsolved Ni 0.4 Fe 0.6 NPs and a new composition with a chemical formula of AB 0.924 O 3− δ were observed. The multi-phase fuel electrode demonstrated decreased polarization resistances.…”