Abstract
In this study, a novel PrBa0.5Sr0.5Fe2-xGexO5+δ (PBSFG) double perovskite is first introduced by the co-substitution of Sr for A-sites and Ge for B-sites as a high-performance and redox-stable anode material for solid oxide fuel cells. The modification of the A-sites of PrBaFe2O5+δ by Sr-doping (PBSF) significantly enhances electrical conductivity of PBSF under a reducing atmosphere by several orders of magnitude at 800 °C. Subsequently, Ge-doping on B-sites leads to meaningful increases in oxygen ion conductivity of PBSFG, and is owing to increases in the oxygen vacancy concentration. The electrochemical performances of PBSFG-Ce0.9Gd0.1O2-δ (GDC) are evaluated using a composite anode with a GDC|Zr0.79Sc0.2Ce0.01O2-δ (ScSZ)|GDC electrolyte (~100 μm) and a La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode. The cell shows critical improvement in the maximum power density (838.4 mW cm−2 at 800 °C) relative to the PrBaFe2O5+δ composite (497.6 mW cm−2). Moreover, it shows good redox-cycle stability from fuel to air under a current load.
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