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Efficient and durable seawater electrolysis with a V2O3-protected catalyst.

Huashuai Hu1, Zhaorui Zhang1, Lijia Liu2

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Developing a novel catalyst with a protective V2O3 layer enables efficient green hydrogen production from seawater. This breakthrough offers a cost-effective solution for sustainable energy, overcoming harsh marine conditions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • The ocean represents a vast resource for hydrogen production, but harsh seawater conditions impede efficient electrocatalyst performance.
  • Developing robust electrocatalysts is crucial for sustainable hydrogen generation and water development.

Purpose of the Study:

  • To engineer a high-performance electrocatalyst for hydrogen production in seawater.
  • To investigate a protective V2O3 layer for enhanced catalyst stability and activity.
  • To demonstrate the efficacy of the V2O3-protected catalyst in anion exchange membrane water electrolyzers (AEMWE).

Main Methods:

  • Incorporation of a V2O3 protective layer onto low-loaded Pt and Ni3N dual-active sites.
  • Electrocatalytic performance testing in simulated seawater.
  • Durability assessment over 500 hours.
  • Assembly and testing of anion exchange membrane water electrolyzers (AEMWE).
  • In situ localized pH analysis to elucidate the protective mechanism.

Main Results:

  • The V2O3-protected catalyst achieved an ultralow overpotential (80 mV at 500 mA cm-2) and significantly enhanced mass activity (30.86 times higher than Pt-C).
  • Exceptional stability was demonstrated, maintaining performance for over 500 hours in seawater.
  • The assembled AEMWE exhibited superior activity and durability under demanding industrial conditions.
  • The V2O3 layer effectively regulated the microcatalytic environment by sequestering OH- ions and mitigating corrosion and precipitation.

Conclusions:

  • The V2O3 protective layer strategy is a promising approach for stabilizing electrocatalysts in harsh seawater environments.
  • This method facilitates cost-effective, large-scale green hydrogen production.
  • The V2O3 layer's Lewis acid properties are key to its protective and performance-enhancing functions.