Auto-programmed construction of an iron-incorporated cobalt-molybdenum complex towards enhanced electrocatalytic water oxidation

Yanna Guo, Yunqing Kang, Takuma Kamibe, Bo Jiang, Yusuke Yamauchi, Yoshiyuki Sugahara*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Development of metal complexes which can be used directly as electrocatalysts for oxygen evolution reaction (OER) is arousing great interest although still in its infancy. Here, an amorphous iron-incorporated cobalt-molybdenum-dithiooxamide (Dto) complex, Fe-CoMo(Dto), which can be applied directly for water oxidation, has been developed using an one-step room-temperature coordination polymerization and self-assembly process. In-situ electrochemical activation of Fe-CoMo(Dto) during electrocatalytic operation promotes structural evolution to form electrocatalytically active species for OER. Detailed investigation of the intermediates obtained after different cyclic voltammetry (CV) cycles of OER measurement showed that amorphous spherical Fe-CoMo(Dto) nanoparticles evolve gradually into corresponding metal (oxyhydr)oxides with hexagonal nanoplate shapes, which have been identified to be real active species for enhanced OER activity. Consequently, the so-activated Fe-CoMo(Dto) complex exhibits remarkable electrocatalytic activity for OER, with a low overpotential of 294 mV at a current density of 10 mA cm−2 and a reduced Tafel slope of 66 mV dec−1.

Original languageEnglish
Article number140464
JournalChemical Engineering Journal
Volume457
DOIs
Publication statusPublished - 2023 Feb 1

Keywords

  • Electrochemical activation
  • Metal complex
  • Oxygen evolution reaction
  • Structural evolution

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Fingerprint

Dive into the research topics of 'Auto-programmed construction of an iron-incorporated cobalt-molybdenum complex towards enhanced electrocatalytic water oxidation'. Together they form a unique fingerprint.

Cite this