Exploring the Influence of Composition and Morphology on the oxygen evolution reaction Performance of Co-Based Catalysts

Fatemeh Poureshghi*, Frode Seland, Jens Oluf Jensen, Megan Muriel Heath, Svein Sunde

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Efficient catalysts for the oxygen evolution reaction (OER) are essential for advancing renewable energy technologies. This study focuses on the synthesis and characterization of CoxPy, CoO, CoP, NiCoP, and NiCo/C nanoparticles as catalysts for the oxygen evolution reaction (OER). The CoxPy nanoparticles exhibited a sea-urchin-like morphology, providing a high surface area for electrocatalytic activity. Other catalysts exhibited distinct morphologies, including spherical particles and porous structures. Characterization techniques, such as transmission electron microscopy and X-ray diffraction, confirmed the morphology and composition of the synthesized nanoparticles. The electrocatalytic performance of the catalysts was evaluated through polarization curve measurements, and a microkinetic steady-state model based on the Electrochemical Oxide Path was developed to understand the OER mechanism. The impact of adventitious Fe on catalyst activity was also investigated, revealing the high sensitivity of CoxPy to Fe. The findings suggest the dominance of the Electrochemical Oxide Path in the OER mechanism for all catalysts, with NiCoP showing the lowest onset potential.
Original languageEnglish
Article number171627
JournalJournal of Alloys and Compounds
Volume967
Number of pages14
ISSN0925-8388
DOIs
Publication statusPublished - 2023

Keywords

  • Water oxidation
  • Co-based catalysts
  • Cobalt phosphide
  • Sea-urchin-like morphology

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