Electroactivity of NiCr Catalysts for Urea Oxidation in Alkaline Electrolyte

Ramesh Kumar Singh, Alex Schechter

Research output: Contribution to journalArticlepeer-review


Inexpensive Ni-based catalysts have shown comparable urea oxidation activity to that of precious metals in an alkaline electrolyte. We investigated the urea oxidation on binary NiCr catalysts supported on a carbon matrix in 1 m KOH and 0.33 m urea. The amount of Cr was optimized in the catalyst layer, and it was found that the catalyst with 40 % Cr (Ni60Cr40/C) exhibits the highest urea oxidation activity of 2933 mA mgNi −1 at 0.55 V; with an onset potential of 0.32 V vs. Ag/AgCl. Chronoamperometry curves of NiCr catalysts show stability over 2000 s in oxidizing urea. A lower charge-transfer resistance of 3.3 Ω cm2 at 0.40 V was calculated on Ni60Cr40/C compared to that on Ni/C (13 Ω cm2). The exceptionally high mass activity of Ni60Cr40/C is attributed to its improved charge-transfer kinetics, enhanced surface coverage of NiII/NiIII redox center, better dispersion of Ni nuclei, and a low-Tafel slope.

Original languageEnglish
Pages (from-to)3374-3379
Number of pages6
Issue number17
StatePublished - 8 Sep 2017


  • chromium
  • electrochemistry
  • nickel
  • oxidation
  • surface chemistry

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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