Nickel and cobalt bimetallic hydroxide catalysts for urea electro-oxidation

Wei Yan, Dan Wang, Gerardine G. Botte

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271 Scopus citations


Nickel-Cobalt bimetallic hydroxide electrocatalysts, synthesized through a one-step electrodeposition method, were evaluated for the oxidation of urea in alkaline conditions with the intention of reducing the oxidation overpotential for this reaction. The Nickel-Cobalt bimetallic hydroxide catalysts were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS), Raman spectroscopy, cyclic voltammetry (CV), and polarization techniques. A significant reduction in the overpotential (150 mV) of the reaction was observed with the Nickel-Cobalt bimetallic hydroxide electrode (ca. 43% Co content) when compared to a nickel hydroxide electrode. The decrease of the urea oxidation potential on the Nickel-Cobalt bimetallic hydroxide electrodes reveals great potential for future applications of urea electro-oxidation, including wastewater remediation, hydrogen production, sensors, and fuel cells.

Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalElectrochimica Acta
StatePublished - Feb 1 2012


  • Alkaline electrolysis
  • Hydrogen production
  • Nickel-Cobalt bimetallic hydroxide catalyst
  • Urea electro-oxidation


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