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Residual Selenium-Assisted Oxidation Pathway Modulation in Cobalt Selenide for Enhanced Oxygen Evolution Reaction.

Yeongeun Jang1, Seunghwa Lee1

  • 1Department of Chemical Engineering, Changwon National University, Changwon, 51140, Republic of Korea.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
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Residual selenium in cobalt selenides (CoSex) enhances oxygen evolution reaction (OER) catalysis. Even after leaching, retained selenium stabilizes active cobalt oxides, boosting catalytic performance.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Cobalt selenides (CoSex) are investigated as potential catalysts for the oxygen evolution reaction (OER).
  • The precise role of selenium (Se) in the catalytic process and material transformation is not fully understood.

Purpose of the Study:

  • To investigate the electrochemical transformation of cobalt selenides during alkaline OER.
  • To determine how residual selenium influences the catalytic activity and material properties.

Main Methods:

  • Electrochemical characterization of cobalt selenides under OER conditions.
  • Analysis of material composition and structure before and after electrolysis to observe selenium distribution and cobalt oxidation states.

Main Results:

  • Surface selenium is predominantly leached during OER, but significant selenium is retained in subsurface and bulk regions.
  • Residual selenium promotes the formation and stabilization of highly oxidized cobalt species (Co3+, Co4+).
  • Selenium influences the oxidation pathway towards CoO2 via β-CoOOH, leading to enhanced OER activity compared to Se-free samples.

Conclusions:

  • Residual selenium acts as a crucial modulator in cobalt selenide electrocatalysts during OER.
  • Understanding selenium's role provides insights for designing advanced transition metal chalcogenide catalysts.