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<p>Iridium (Ir)-based materials are the only commercializable class of anode electrocatalysts for acidic oxygen evolution reaction (OER) in proton exchange membrane water electrolyzers (PEMWE). Intending to large-scale implement of PEMWE, it is urgent to improve their OER performances for reducing the usage of high-cost Ir element. Herein, we report an elaborate synthesis of ultrathin Ir/WO<sub><i>x</i></sub> hybrid nanosheets equipped with abundant 2D-confined heterointerfaces (denoted as Ir/WO<sub><i>x</i></sub> NSs), which are composed of ultrathin Ir nanograins embedded in amorphous WO<sub><i>x</i></sub> matrix, to substantially enhance the acidic OER. The Ir/WO<sub><i>x</i></sub> NSs achieve a notable mass activity of 2.34 A mg<sub>Ir</sub><sup>−1</sup> at an overpotential of 300 mV, which is approximately 11.1 and 9.8 times higher than those of Ir NSs and commercial Ir/C, respectively. The 2D-confined interactions between crystalline Ir nanograins and amorphous WO<sub><i>x</i></sub> matrix establish synergistic bifunctional sites and efficient charge transfer interfaces, which effectively accelerate the initial hydrolysis dissociation step. Moreover, on interfacial Ir atoms, the adsorption of *O and subsequent formation of *OOH intermediates are thermodynamically facilitated, making the OER process more favorable through the adsorbate evolution mechanism. Finally, the Ir/WO<sub><i>x</i></sub> NSs based PEMWE demonstrates a low cell voltage of only 1.71 V to deliver 1.0 A cm<sup>−2</sup> current density as well as an outstanding long-term durability, realizing efficient and stable green hydrogen production. This work highlights the engineering of 2D-confined metal-oxide interfacial electrocatalysts for efficient energy conversion applications.</p>

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Two-dimensionally confined Ir/WOx heterointerfaces boost the acidic oxygen evolution reaction for ampere-level stable PEM water electrolysis

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Junlin Cai,
  • Hongpu Huang,
  • Weizhen Chen,
  • Yuhang Peng,
  • Luhong Fu,
  • Shupeng Wang,
  • Zhongyuan Zou,
  • Zhichao Fu,
  • Xiaohong Wang,
  • Zhaoxiong Xie,
  • Shuifen Xie

摘要

Iridium (Ir)-based materials are the only commercializable class of anode electrocatalysts for acidic oxygen evolution reaction (OER) in proton exchange membrane water electrolyzers (PEMWE). Intending to large-scale implement of PEMWE, it is urgent to improve their OER performances for reducing the usage of high-cost Ir element. Herein, we report an elaborate synthesis of ultrathin Ir/WOx hybrid nanosheets equipped with abundant 2D-confined heterointerfaces (denoted as Ir/WOx NSs), which are composed of ultrathin Ir nanograins embedded in amorphous WOx matrix, to substantially enhance the acidic OER. The Ir/WOx NSs achieve a notable mass activity of 2.34 A mgIr−1 at an overpotential of 300 mV, which is approximately 11.1 and 9.8 times higher than those of Ir NSs and commercial Ir/C, respectively. The 2D-confined interactions between crystalline Ir nanograins and amorphous WOx matrix establish synergistic bifunctional sites and efficient charge transfer interfaces, which effectively accelerate the initial hydrolysis dissociation step. Moreover, on interfacial Ir atoms, the adsorption of *O and subsequent formation of *OOH intermediates are thermodynamically facilitated, making the OER process more favorable through the adsorbate evolution mechanism. Finally, the Ir/WOx NSs based PEMWE demonstrates a low cell voltage of only 1.71 V to deliver 1.0 A cm−2 current density as well as an outstanding long-term durability, realizing efficient and stable green hydrogen production. This work highlights the engineering of 2D-confined metal-oxide interfacial electrocatalysts for efficient energy conversion applications.