Selective synthesis of monodisperse CoO nanooctahedra as catalysts for electrochemical water oxidation

Massih Sarif, Jan Hilgert, Ibrahim Khan, Richard A. Harris, Sergi Plana-Ruiz, Muhammad Ashraf, Eva Pütz, Jörg Schemberg, Martin Panthöfer, Ute Kolb, Muhammad Nawaz Tahir, Wolfgang Tremel

Research output: Journal PublicationArticlepeer-review

16 Citations (Scopus)


Thermal decomposition is a promising route for the synthesis of metal oxide nanoparticles because size and morphology can be tuned by minute control of the reaction variables. We synthesized CoO nanooctahedra with diameters of ∼48 nm and a narrow size distribution. Full control over nanoparticle size and morphology could be obtained by controlling the reaction time, surfactant ratio, and reactant concentrations. We show that the particle size does not increase monotonically with time or surfactant concentration but passes through minima or maxima. We unravel the critical role of the surfactants in nucleation and growth and rationalize the observed experimental trends in accordance with simulation experiments. The as-synthesized CoO nanooctahedra exhibit superior electrocatalytic activity with long-term stability during oxygen evolution. The morphology of the CoO particles controls the electrocatalytic reaction through the distinct surface sites involved in the oxygen evolution reaction.

Original languageEnglish
Pages (from-to)13804-13816
Number of pages13
Issue number46
Publication statusPublished - 24 Nov 2020
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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