Scholarlink

<p>The hydrogen oxidation reaction (HOR) shows fast kinetics in proton exchange membrane fuel cells (PEMFCs), and has not drawn intense attention. Here, we propose a tandem electrocatalysis concept, decoupling HOR on two independent active sites for accelerated kinetics. As a proof-of-concept application, a Ru-based tandem HOR catalyst is designed, with Ru nanoclusters decorated with Pt single atoms. Experimental and theoretical studies suggest that H<sub>2</sub> dissociation occurs at Ru sites, and then the produced H species migrate to Pt sites followed by the desorption of H<sup>+</sup>. The strong Ru-H interaction promotes the H<sub>2</sub> dissociation step, while the optimum Pt-H interaction ensures the fast desorption, thereby substantially enhancing the HOR kinetics. In H<sub>2</sub>–O<sub>2</sub> fuel cells, this catalyst enables a peak power density of 1.91 W cm<sup>−2</sup> and a high anodic mass activity of 23.12 A mg<sup>−1</sup> at 0.9 V<sub>iR-free</sub> with an ultralow noble metal loading of 5 μg cm<sup>−2</sup>. This work advances the development of low-cost anode catalysts for fuel cells and provides more insight into understanding hydrogen electrocatalysis.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Decoupling fast hydrogen oxidation reaction on a tandem electrocatalyst

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月22日

查看全文
  • Wei Guo,
  • Guoqiang Zhao,
  • Ziang Sun,
  • Bingxing Zhang,
  • Dongyue Xin,
  • Mingxia Gao,
  • Yongfeng Liu,
  • Zhongbin Zhuang,
  • Hai-Wei Liang,
  • Hongge Pan,
  • Wenping Sun

摘要

The hydrogen oxidation reaction (HOR) shows fast kinetics in proton exchange membrane fuel cells (PEMFCs), and has not drawn intense attention. Here, we propose a tandem electrocatalysis concept, decoupling HOR on two independent active sites for accelerated kinetics. As a proof-of-concept application, a Ru-based tandem HOR catalyst is designed, with Ru nanoclusters decorated with Pt single atoms. Experimental and theoretical studies suggest that H2 dissociation occurs at Ru sites, and then the produced H species migrate to Pt sites followed by the desorption of H+. The strong Ru-H interaction promotes the H2 dissociation step, while the optimum Pt-H interaction ensures the fast desorption, thereby substantially enhancing the HOR kinetics. In H2–O2 fuel cells, this catalyst enables a peak power density of 1.91 W cm−2 and a high anodic mass activity of 23.12 A mg−1 at 0.9 ViR-free with an ultralow noble metal loading of 5 μg cm−2. This work advances the development of low-cost anode catalysts for fuel cells and provides more insight into understanding hydrogen electrocatalysis.