CuCo2O4 nanoparticles on nitrogenated graphene as highly efficient oxygen evolution catalyst

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Abstract

Highly active, durable and cost-effective electrocatalysts for oxygen evolution reaction play a key role on developing energy-conversion technologies. Here, we report a composite material consisting of CuCo2O4 nanoparticles anchored on nitrogenated reduced graphene oxide (CuCo2O4/NrGO) as a highly efficient oxygen evolution electrocatalyst in both alkaline and neutral solutions for the first time. In 1 M KOH, 0.1 M KOH and 0.1 M PBS, CuCo2O4/NrGO catalyst exhibited a current density of 10 mA cm2 at a small overpotential of 0.36 V, 0.41 V and 1.15 V respectively, which are better than those of RuO2 and IrO2 catalysts. The CuCo2O4/NrGO exhibited good stability under strong alkaline conditions. The enhanced OER performance of CuCo2O4/NrGO is attributed to the presence of Cu2þ ions at the octahedral sites, reduction in the size of the CuCo2O4 nanoparticles as measured by the TEM, enhancement of electrochemically active surface area (ECSA), and synergetic effect between CuCo2O4 nanoparticles and NrGO sheets. This cost effective and highly efficient catalyst can possibly replace the expensive catalysts such as RuO2 and IrO2.
Original languageEnglish
Pages (from-to)243-251
Number of pages9
JournalJournal of Power Sources
Volume281
Early online date2 Feb 2015
DOIs
Publication statusPublished - 1 May 2015

Keywords

  • CuCo2O4
  • nitrogenated graphene
  • oxygen evolution reaction
  • electrocatalyst
  • water oxidation

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