Ternary nickel–cobalt–manganese spinel oxide nanoparticles as heterogeneous electrocatalysts for oxygen evolution and oxygen reduction reaction

P. Sivakumar, Palaniappan Subramanian, Thandavarayan Maiyalagan, Aharon Gedanken, Alex Schechter

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Multimetallic nanostructure spinels composed of nickel, cobalt, and manganese ions were synthesized and their bifunctional catalytic activity towards oxygen evolution and oxygen reduction reaction in alkaline pH is reported. Three different compositions, namely, NiCoMnO 4 Ni 1.5 Co 0.75 Mn 0.75 O 4 and Ni 2 Co 0.5 Mn 0.5 O 4 were prepared by a simple template-free hydrothermal route followed by a thermal treatment in air at 600 °C. The ORR/OER activity and the stability of these ternary metal oxides strongly depend on the composition of transition metals. The best performing Ni 1.5 Co 0.75 Mn 0.75 O 4 catalyst exhibits modest OER and ORR activity with an overpotential difference (ΔE = E ORR -E OER ) of 0.79 V vs. RHE between two reactions in alkaline solution, comparable to expensive and supported IrO 2 Pt catalysts. Electrochemical studies and extensive physical characterizations indicated that amount of nickel substituted in the crystal lattice influence the bifunctional catalytic activity of the studied ternary metal oxide compositions.

Original languageEnglish
Pages (from-to)190-196
Number of pages7
JournalMaterials Chemistry and Physics
Volume229
DOIs
StatePublished - 1 May 2019

Keywords

  • Bifunctional
  • Electrocatalysts
  • Oxygen evolution
  • Oxygen reduction
  • Spinel oxides

Fingerprint

Dive into the research topics of 'Ternary nickel–cobalt–manganese spinel oxide nanoparticles as heterogeneous electrocatalysts for oxygen evolution and oxygen reduction reaction'. Together they form a unique fingerprint.

Cite this