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<p>The commercialization of proton exchange membrane water electrolysis (PEMWE) is impeded by the significant dependence of the anodic oxygen evolution reaction (OER) on limited iridium-based catalysts. Creating electrocatalysts with elevated activity and enhanced Ir atom usage is essential to overcoming this obstacle. Herein, we utilize strong metal-support interactions (SMSI) to uniformly load Ir nanoclusters onto highly conductive and corrosion-resistant one-dimensional molybdenum nitride nanowires, therefore creating a series of low Ir loading Ir<sub>x%</sub>-Mo<sub>2</sub>N heterostructure bifunctional electrocatalysts. In acidic conditions, the optimum Ir<sub>3.2%</sub>-Mo<sub>2</sub>N display overpotentials of merely 271 mV and 85 mV to get current densities of 10&#xa0;mA cm<sup>−2</sup> in OER and hydrogen evolution reaction (HER), respectively, surpassing commercial electrocatalysts and other variants with elevated Ir loadings. Thorough characterization and mechanistic investigations demonstrate substantial interfacial electron transport between Mo<sub>2</sub>N and Ir, resulting in charge redistribution at the interface and modulation of the electronic structure at the iridium active sites, which stabilizes the distributed Ir species and significantly optimized the adsorption energy for the essential oxygenated intermediates and hydrogen coverage, hence greatly increasing the intrinsic electrocatalytic activity. This study illustrates that nitride-mediated robust electronic interactions constitute an excellent strategy for developing efficient electrocatalysts with low loading of precious metal.</p> Graphical Abstract <p></p>

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Interfacial Electron Transfer Promotes Acidic Water Electrolysis of Ir-Mo2N by Enhancing Hydroxyl Coverage

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • Xinxuan zhang,
  • Zimiao Liu,
  • Yi Feng

摘要

The commercialization of proton exchange membrane water electrolysis (PEMWE) is impeded by the significant dependence of the anodic oxygen evolution reaction (OER) on limited iridium-based catalysts. Creating electrocatalysts with elevated activity and enhanced Ir atom usage is essential to overcoming this obstacle. Herein, we utilize strong metal-support interactions (SMSI) to uniformly load Ir nanoclusters onto highly conductive and corrosion-resistant one-dimensional molybdenum nitride nanowires, therefore creating a series of low Ir loading Irx%-Mo2N heterostructure bifunctional electrocatalysts. In acidic conditions, the optimum Ir3.2%-Mo2N display overpotentials of merely 271 mV and 85 mV to get current densities of 10 mA cm−2 in OER and hydrogen evolution reaction (HER), respectively, surpassing commercial electrocatalysts and other variants with elevated Ir loadings. Thorough characterization and mechanistic investigations demonstrate substantial interfacial electron transport between Mo2N and Ir, resulting in charge redistribution at the interface and modulation of the electronic structure at the iridium active sites, which stabilizes the distributed Ir species and significantly optimized the adsorption energy for the essential oxygenated intermediates and hydrogen coverage, hence greatly increasing the intrinsic electrocatalytic activity. This study illustrates that nitride-mediated robust electronic interactions constitute an excellent strategy for developing efficient electrocatalysts with low loading of precious metal.

Graphical Abstract