CoO-impregnated NiO-YSZ (yttria-stabilized zirconia) is a possible electrocatalyst for direct methane electrooxidation with both high catalytic activity and the ability to mitigate coking. The physical and electrochemical properties of CoO-impregnated NiO-YSZ anodes are investigated and benchmarked against NiO-YSZ and CeO-impregnated NiO-YSZ anodes. The following methane electrooxidation activity trend: CoO-impregnated NiO-YSZ > CeO-impregnated NiO-YSZ > NiO-YSZ with (exchange current density) values of 88, 83, and 2 mA cm, respectively, is obtained in the high overpotential region. The high activity of CoO-impregnated NiO-YSZ is attributed to the changes in the electronic structure and microstructure with the incorporation of nickel into the lattice of CoO as observed using X-ray photoelectron spectroscopy, temperature-programmed reduction, high-resolution transmission electron microscopy, and field emission scanning electron microscopy. CoO-impregnated NiO-YSZ also demonstrated the least coking during operation, confirming its utility as a methane electrooxidation catalyst.
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