Single Co-Atoms as Electrocatalysts for Efficient Hydrazine Oxidation Reaction

Ravishankar G. Kadam, Tao Zhang, Dagmar Zaoralová, Miroslav Medveď, Aristides Bakandritsos, Ondřej Tomanec, Martin Petr, Johnny Zhu Chen, Jeffrey T. Miller, Michal Otyepka, Radek Zbořil, Tewodros Asefa, Manoj B. Gawande

Research output: Contribution to journalArticlepeer-review

Abstract

Single-atom catalysts (SACs) have aroused great attention due to their high atom efficiency and unprecedented catalytic properties. A remaining challenge is to anchor the single atoms individually on support materials via strong interactions. Herein, single atom Co sites have been developed on functionalized graphene by taking advantage of the strong interaction between Co2+ ions and the nitrile group of cyanographene. The potential of the material, which is named G(CN)-Co, as a SAC is demonstrated using the electrocatalytic hydrazine oxidation reaction (HzOR). The material exhibits excellent catalytic activity for HzOR, driving the reaction with low overpotential and high current density while remaining stable during long reaction times. Thus, this material can be a promising alternative to conventional noble metal-based catalysts that are currently widely used in HzOR-based fuel cells. Density functional theory calculations of the reaction mechanism over the material reveal that the Co(II) sites on G(CN)-Co can efficiently interact with hydrazine molecules and promote the N-H bond-dissociation steps involved in the HzOR.

Original languageEnglish
Article number2006477
JournalSmall
Volume17
Issue number16
DOIs
Publication statusPublished - Apr 22 2021

Keywords

  • electrocatalysis
  • hydrazine oxidation reaction
  • renewable energy
  • single Co atom catalyst
  • single atom catalyst

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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