Abstract
Three-dimensional NixCo3-xO4 nanowire arrays (NWAs) grown on carbon fiber cloth (CFC) are successfully fabricated by a simple hydrothermal method combined with a post annealing treatment, which are directly applied as binder-free electrodes for urea oxidation reaction (UOR). Remarkably, the Ni1.5Co1.5O4 NWAs/CFC sample shows much higher catalytic activity, lower overpotential, better stability towards urea electro-oxidation compared to NiO synthesized by the similar procedure. The Ni1.5Co1.5O4 electrode delivers a current density of 98.5 mA cm-2 mg-1 at 0.45 V (vs. Ag/AgCl) in 1 M KOH and 0.33 M urea electrolyte after 8-hour test. These nickel cobalt oxides electrodes with advanced architecture and desirable catalytic performance show great potential for the applications of urea electro-oxidation, including wastewater remediation, hydrogen production, sensors, and fuel cells.
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