Exceptionally Active and Stable Spinel Nickel Manganese Oxide Electrocatalysts for Urea Oxidation Reaction

Sivakumar Periyasamy, Palaniappan Subramanian, Elena Levi, Doron Aurbach, Aharon Gedanken, Alex Schechter

Research output: Contribution to journalArticlepeer-review

133 Scopus citations

Abstract

Spinel nickel manganese oxides, widely used materials in the lithium ion battery high voltage cathode, were studied in urea oxidation catalysis. NiMn2O4, Ni1.5Mn1.5O4, and MnNi2O4 were synthesized by a simple template-free hydrothermal route followed by a thermal treatment in air at 800 °C. Rietveld analysis performed on nonstoichiometric nickel manganese oxide-Ni1.5Mn1.5O4 revealed the presence of three mixed phases: two spinel phases with different lattice parameters and NiO unlike the other two spinels NiMn2O4 and MnNi2O4. The electroactivity of nickel manganese oxide materials toward the oxidation of urea in alkaline solution is evaluated using cyclic voltammetric measurements. Ni1.5Mn1.5O4 exhibits excellent redox characteristics and lower charge transfer resistances in comparison with other compositions of nickel manganese oxides and nickel oxide prepared under similar conditions.The Ni1.5Mn1.5O4modified electrode oxidizes urea at 0.29 V versus Ag/AgCl with a corresponding current density of 6.9 mA cm-2. At a low catalyst loading of 50 μg cm-2, the urea oxidation current density of Ni1.5Mn1.5O4 in alkaline solution is 7 times higher than that of nickel oxide and 4 times higher than that of NiMn2O4 and MnNi2O4, respectively.

Original languageEnglish
Pages (from-to)12176-12185
Number of pages10
JournalACS applied materials & interfaces
Volume8
Issue number19
DOIs
StatePublished - 18 May 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

Keywords

  • cyclic voltammetry
  • electrochemical impedance spectroscopy
  • hydrothermal synthesis
  • nickel manganese oxide
  • urea oxidation

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