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Utilizing reconstruction achieves ultrastable water electrolysis.

Yu Lin1,2, Danji Huang3, Qunlei Wen1

  • 1State Key Laboratory of Materials Processing and Die & Mould Technology, and School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.

Proceedings of the National Academy of Sciences of the United States of America
|December 2, 2024
PubMed
Summary
This summary is machine-generated.

A novel sequential leaching strategy using molybdenum (Mo) dopants enhances nickel-iron sulfide (NiFe-S) catalysts for oxygen evolution reaction (OER) in water electrolysis. This method boosts catalyst stability and lowers energy consumption for green hydrogen production.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Dissolution of active atoms under operating potential degrades catalyst performance in oxygen evolution reaction (OER).
  • This degradation limits the practical application of highly active catalysts in industrial water electrolysis.
  • Existing catalysts face challenges in maintaining stability and efficiency during prolonged operation.

Purpose of the Study:

  • To develop a sequential leaching strategy to enhance the dynamic restructuring and chemical bond strength of catalysts for stable OER.
  • To investigate the role of foreign Mo dopants as sacrificial agents to mitigate oxidation corrosion in nickel-iron sulfides (NiFe-S).
  • To improve the efficiency and durability of catalysts for industrial water electrolysis and green hydrogen production.

Main Methods:

  • Introduced foreign Mo dopants as a sacrificial agent in nickel-iron sulfides (NiFe-S) for preleaching.
  • Utilized operando spectroscopy to monitor Mo dopant leaching and adsorption as molybdate on NiFe O(S)OH surfaces.
  • Employed crystal occupation hamiltonian population analysis to understand charge transfer and its effect on M─S bond energy.

Main Results:

  • Foreign Mo dopants leached and adsorbed as molybdate, enhancing M─S bond energy and preventing further Fe/Ni leaching.
  • The modified catalyst achieved an ultralow overpotential of 250 mV at 400 mA cm-2 and high stability (>3,700 h at 100 mA cm-2).
  • Industrial water electrolysis demonstrated ultralow energy consumption (4.30 kWh m-3H2) and high stability (>250 h at 8,000 mA).

Conclusions:

  • The sequential leaching strategy effectively enhances catalyst stability and OER performance by controlling ion leaching.
  • The developed NiFe-S catalyst offers a viable pathway for cost-effective green hydrogen production.
  • Achieved hydrogen production cost of US$2.46/kgH2 aligns with future green hydrogen targets.