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<p>Proton exchange membrane water electrolyzers (PEMWEs) are pivotal for sustainable hydrogen production, yet the corrosion-induced TiO<sub><i>x</i></sub> on porous transport layers (PTLs) introduces Schottky contact barriers and pinch-off effects, severely impeding their charge transfer and efficiency. Herein, a cost-effective MoIrO<sub><i>x</i></sub> coating via spray deposition and thermal treatment on Ti felts is proposed, and the coating forms a conductive interlayer that establishes a Schottky barrier staircase, reducing the effective electron transfer barrier and isolating TiO<sub><i>x</i></sub> from the ionomer to mitigate the pinch-off effect. The optimal PTL achieves a current density of 3.27 A cm<sup>−2</sup> at 2 V, surpassing uncoated Ti felts by 59.5%, and the MoIrO<sub><i>x</i></sub> interlayer suppresses localized electron accumulation at the interface, enabling stable operation with ultra-low catalyst loadings by preventing direct ionomer-TiO<sub><i>x</i></sub> contact. This work demonstrates a scalable strategy to enhance PEMWE efficiency and durability while minimizing precious metal reliance, offering critical insights into interface engineering for electrolyzers.</p>

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Suppression of Schottky effect with highly corrosion-resistant coating on porous transport layers for interface optimization in proton exchange membrane electrolyzers

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Yun Liu,
  • Bingqian Pang,
  • Sihan Mao,
  • Wenjuan Shi,
  • Tianjiao Wang,
  • Peng Rao,
  • Jing Li,
  • Min Wang,
  • Yuliang Yuan,
  • Xiaodong Shi,
  • Xinlong Tian,
  • Zhenye Kang

摘要

Proton exchange membrane water electrolyzers (PEMWEs) are pivotal for sustainable hydrogen production, yet the corrosion-induced TiOx on porous transport layers (PTLs) introduces Schottky contact barriers and pinch-off effects, severely impeding their charge transfer and efficiency. Herein, a cost-effective MoIrOx coating via spray deposition and thermal treatment on Ti felts is proposed, and the coating forms a conductive interlayer that establishes a Schottky barrier staircase, reducing the effective electron transfer barrier and isolating TiOx from the ionomer to mitigate the pinch-off effect. The optimal PTL achieves a current density of 3.27 A cm−2 at 2 V, surpassing uncoated Ti felts by 59.5%, and the MoIrOx interlayer suppresses localized electron accumulation at the interface, enabling stable operation with ultra-low catalyst loadings by preventing direct ionomer-TiOx contact. This work demonstrates a scalable strategy to enhance PEMWE efficiency and durability while minimizing precious metal reliance, offering critical insights into interface engineering for electrolyzers.