In-situ exsolution super-excess Ni metal anchoring on Ba2V0.4Fe0.9Mo0.7O6−δ using as high catalytic activity solid oxide fuel cell composite anode

Abstract

Perovskite materials, such as Ba₂FeMoO_6−δ using as Solid oxide fuel cells (SOFCs) anodes have shown excellent anti-carbon deposition to catalyze hydrocarbon fuel gases. However, the perovskite-based anodes still show insufficient catalytic activity and conductivity, which restricted for achieving highest SOFC power output. In this work, a Ni super-excess Ba₂V_0.4Fe_0.9Mo_0.7O_6−δ-Ni_x (BVFMO-Ni_x, x = 0, 0.2, 0.4, 0.6) composite anode was first synthesized by in-situ exsolving FeNi₃ alloy nanoparticles and firmly anchoring on the surface of parent BVFMO, which shows obvious improvement in conductivity and catalytic activity for methane fuel gas. When BVFMO-Ni_0.4 is subjected to methane reforming for hydrogen production, the conversion rate reaches 56 % at 750 °C and remains above 50 % for more than 640 h continue test. Using BVFMO-Ni_0.4 as a single-cell composite anode and testing at 850 °C, the maximum power outputs reach 991 mW cm⁻² and 578 mW cm⁻² with hydrogen and methane as fuel gas, respectively.