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<p>Platinum (Pt) is widely recognized as the benchmark catalyst for the hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR) in acidic electrolytes; however, its catalytic performance in alkaline media is markedly hindered by excessively strong hydrogen binding energy (HBE). In this work, we report oxygen-modified ultrasmall RuCu nanocrystals (RuCu/C-200) as an efficient catalyst for both alkaline HER and HOR. The RuCu/C-200 catalyst shows excellent HER performance (9 mV at 10 mA cm<sup>−2</sup>, Tafel slope 19.7 mV dec<sup>−1</sup>) and 4.2-fold higher HOR exchange current density than the unannealed sample. Mechanistic studies reveal that the optimized HBE, hydroxyl binding energy (OHBE), and the strongly hydrogen-bonded interfacial water, induced by oxygen modification, constitute the intrinsic determinants of the improved catalytic activity. This study highlights the potential of combining nanoscale structural design with oxygen modification as a strategy to develop high-performance Ru-based electrocatalysts for both alkaline HER and HOR.</p>

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Oxygen modification optimizes hydrogen/hydroxyl binding energy and interfacial water structure for enhanced hydrogen evolution and oxidation reactions

  • 期刊论文

  • 发表日期：

    2026年3月20日

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  • Youpeng Cao,
  • Hongling Liu,
  • Lun Li,
  • Jinxian Feng,
  • Yuxuan Xiao,
  • Chengcheng Zhong,
  • Ziwen Feng,
  • Juanjuan Wang,
  • Weng Fai Ip,
  • Hui Pan

摘要

Platinum (Pt) is widely recognized as the benchmark catalyst for the hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR) in acidic electrolytes; however, its catalytic performance in alkaline media is markedly hindered by excessively strong hydrogen binding energy (HBE). In this work, we report oxygen-modified ultrasmall RuCu nanocrystals (RuCu/C-200) as an efficient catalyst for both alkaline HER and HOR. The RuCu/C-200 catalyst shows excellent HER performance (9 mV at 10 mA cm−2, Tafel slope 19.7 mV dec−1) and 4.2-fold higher HOR exchange current density than the unannealed sample. Mechanistic studies reveal that the optimized HBE, hydroxyl binding energy (OHBE), and the strongly hydrogen-bonded interfacial water, induced by oxygen modification, constitute the intrinsic determinants of the improved catalytic activity. This study highlights the potential of combining nanoscale structural design with oxygen modification as a strategy to develop high-performance Ru-based electrocatalysts for both alkaline HER and HOR.