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Amorphous Cobalt Vanadium Oxide as a Highly Active Electrocatalyst for Oxygen Evolution.

Laurent Liardet1, Xile Hu1

  • 1Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.

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Summary
This summary is machine-generated.

Cobalt vanadium oxide (CoVO) is a novel electrocatalyst for the oxygen evolution reaction (OER), a key step in water splitting for renewable energy storage. This highly active catalyst significantly improves efficiency and reduces energy loss in the process.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Water splitting stores renewable energy as hydrogen fuel.
  • The oxygen evolution reaction (OER) is a bottleneck in water splitting efficiency.
  • Developing efficient OER catalysts is crucial for advancing hydrogen fuel technology.

Purpose of the Study:

  • To report a highly active electrocatalyst for the oxygen evolution reaction (OER).
  • To design a catalyst based on the volcano plot of metal-OH bond strength and activity.
  • To demonstrate the efficacy of cobalt vanadium oxide (CoVO) as a promising OER catalyst.

Main Methods:

  • Catalyst design guided by a volcano plot correlating metal-OH bond strength with OER activity.
  • Synthesis of cobalt vanadium oxide (CoVO) via a facile hydrothermal route.
  • Electrochemical performance testing of the catalyst immobilized on flat and high-surface-area substrates (nickel foam).

Main Results:

  • The X-ray amorphous phase (a-CoVO) exhibited high OER activity, reaching 10 mA cm⁻² at 347 mV overpotential on a flat substrate.
  • On a 3D nickel foam substrate, a-CoVO achieved 10 mA cm⁻² at a lower overpotential of 254 mV.
  • The catalyst demonstrated an excellent Tafel slope of 35 mV dec⁻¹, indicating efficient OER kinetics.

Conclusions:

  • Amorphous cobalt vanadium oxide (a-CoVO) is a highly active electrocatalyst for oxygen evolution.
  • The catalyst's performance is significantly enhanced on high-surface-area substrates like nickel foam.
  • Metal-OH bond strength is validated as a practical descriptor for designing effective OER catalysts.