Synthesis and characterization of morphologically tailored NiO-Ce_(0.8)Gd_(0.2)O_(2-δ) anode materials for solid oxide fuel cells: A micro-emulsion followed by solvothermal approach

摘要

NiO-Ce_(0.8)Gd_(0.2)O_(2-δ) cermet anode powders with flake-shaped particles have been synthesized using a unique micro-emulsion-mediated solvothcrmal process. With an increase in the amount of urea used as a precipitation agent, the particles change from plate to flake shape in a morphological transition. Well-developed flake-shaped anode powders can be obtained from 24 h of solvothcrmal treatment. The polarization resistance at 800℃ in humidified H_2 and the activation energy of the anode synthesized with 1:4 salt to urea ratio and the solvothermal treatment duration of 24 h are 0.01 Ω cm~2 and 0.53 eV, respectively. In accordance with the polarization resistance results, a single ceil with the MEST4 anode shows a high maximum-power density of 0.32 W cm~2, at 800℃ with a humidified H_2 fuel.