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Correction to "Corrosion-Resistant MoO<sub>3</sub>/Fe<sub>2</sub>O<sub>3</sub>/MoS<sub>2</sub> Heterojunctions Stabilize OH<sup>-</sup> Adsorption for Efficient Light-Assisted Seawater Electrooxidation".

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Molybdate-Modified NiOOH for Efficient Methanol-Assisted Seawater Electrolysis.

Zhen Li1, Youbin Zheng2, Wenhan Zu1

  • 1Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 20, 2025
PubMed
Summary

A novel catalyst enhances green hydrogen production from seawater by using methanol oxidation. This MoO₄²⁻-modified NiOOH catalyst improves efficiency and protects against corrosion, offering a sustainable energy solution.

Keywords:
anti‐corrosiondirect seawater electrolysismethanol electrooxidationmolybdate modulationnon‐electrochemical process

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Seawater electrolysis is key for green hydrogen but faces high energy demands and chlorine evolution.
  • Methanol oxidation reaction (MOR) offers a lower potential alternative to oxygen evolution, reducing competing reactions.
  • Nickel oxyhydroxide (NiOOH) catalysts show MOR activity but suffer from slow kinetics and chloride degradation.

Purpose of the Study:

  • To develop a MoO₄²⁻-modified NiOOH electrocatalyst for enhanced MOR-assisted seawater splitting.
  • To improve the efficiency and stability of hydrogen production from seawater electrolysis.
  • To mitigate electrode corrosion caused by chloride ions in seawater.

Main Methods:

  • Synthesis of a heterojunction electrocatalyst featuring in situ leached MoO₄²⁻ within NiOOH.
  • Electrochemical characterization of the catalyst's performance in MOR-assisted seawater splitting.
  • Evaluation of electrode stability and protection against chloride-induced corrosion.

Main Results:

  • The MoO₄²⁻ modification significantly boosted MOR kinetics by optimizing methanol adsorption and proton transfer.
  • The catalyst demonstrated effective chloride ion repulsion, preventing electrode degradation.
  • The NiMo||Ni(OH)₂/NiMoO₄ electrolyzer achieved 10 mA cm⁻² at a low potential of 1.312 V, outperforming conventional seawater electrolysis (1.576 V).
  • Exceptional stability was observed, maintaining high current densities (1.0 A cm⁻²) for over 130 hours.

Conclusions:

  • The MoO₄²⁻-modified NiOOH electrocatalyst is a highly effective material for efficient and stable MOR-assisted seawater splitting.
  • This approach offers a promising strategy for sustainable green hydrogen production by overcoming key challenges in seawater electrolysis.
  • The catalyst design provides a pathway for developing robust electrocatalysts resistant to corrosive environments.