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Highly porous self-assembled nanostructured ni@c and nio@c were synthesized via calcination of a ni-based metal-organic framework. the morphology, structure, and composition of as synthesized ni@c and nio@c were characterized by SeM, fiB-SeM, teM, and XRD. the electro-catalytic activity of the ni@c and nio@c catalysts towards urea oxidation was investigated using cyclic voltammetry. It was found that the Ni@C had a higher residual carbon content and a higher specific surface area than nio@c, thus exhibiting an enhanced electrochemical performance for urea oxidation. A direct urea fuel cell with Ni@C as an anode catalyst featured an excellent maximum power density of 13.8 mW cm −2 with 0.33 M urea solution in 1 M KOH as fuel and humidified air as oxidant at 50 °C, additionally showing excellent stability during continuous 20-h operation. Thus, this work showed that the highly porous carbon-supported ni catalysts derived from ni-based metal-organic framework can be used for urea oxidation and as an efficient anode material for urea fuel cells.

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