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<p>Hydrazine-assisted water electrolysis presents a promising and efficient hydrogen production technology. However, developing high-performance hydrazine oxidation reaction (HzOR) and hydrogen evolution reaction (HER) bifunctional catalysts remains challenging. Here, we report a bifunctional electrocatalyst of Ru NCs@NPC, embedding the ultrafine Ru nanoclusters into N-doped porous carbon via microwave reduction. Due to the ultrafine Ru nanoclusters and N doping, the composite exhibits exceptional activity for both HER and HzOR, requiring −55 and −67 mV to reach 10 mA·cm<sup>−2</sup> in alkaline media. In the overall hydrazine splitting (OHzS) system, Ru NCs@NPC is used as both anode and cathode materials, achieving 10 mA·cm<sup>−2</sup> only at 0.036 V. The zinc hydrazine (Zn–Hz) battery assembled with Ru NCs@NPC cathode and Zn foil anode can provide a stable voltage of 0.4 V and exhibit 98.5% energy efficiency. Therefore, integrating Zn–Hz battery with OHzS system enables self-powered H<sub>2</sub> evolution. The density function theory calculations reveal that the Ru–N bond increases the metal–support interaction, which optimizes the adsorption energy of Ru to H<sub>2</sub>O and thus shows excellent catalytic activity. The successful preparation and application of Ru NCs@NPC offers a new perspective to the design of advanced bifunctional electrocatalysts.</p>

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Ru nanoclusters immobilized in N-doped porous carbon for efficient hydrazine-assisted hydrogen production and Zn–hydrazine battery

  • 期刊论文

  • 发表日期：

    2025年1月23日

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  • Jun-Lin Huang,
  • Hao Zhang,
  • Tian-Yi Suo,
  • Joao Cunha,
  • Zhi-Peng Yu,
  • Wen-Yuan Xu,
  • Liang Chen,
  • Zhao-Hui Hou,
  • Hong Yin

摘要

Hydrazine-assisted water electrolysis presents a promising and efficient hydrogen production technology. However, developing high-performance hydrazine oxidation reaction (HzOR) and hydrogen evolution reaction (HER) bifunctional catalysts remains challenging. Here, we report a bifunctional electrocatalyst of Ru NCs@NPC, embedding the ultrafine Ru nanoclusters into N-doped porous carbon via microwave reduction. Due to the ultrafine Ru nanoclusters and N doping, the composite exhibits exceptional activity for both HER and HzOR, requiring −55 and −67 mV to reach 10 mA·cm−2 in alkaline media. In the overall hydrazine splitting (OHzS) system, Ru NCs@NPC is used as both anode and cathode materials, achieving 10 mA·cm−2 only at 0.036 V. The zinc hydrazine (Zn–Hz) battery assembled with Ru NCs@NPC cathode and Zn foil anode can provide a stable voltage of 0.4 V and exhibit 98.5% energy efficiency. Therefore, integrating Zn–Hz battery with OHzS system enables self-powered H2 evolution. The density function theory calculations reveal that the Ru–N bond increases the metal–support interaction, which optimizes the adsorption energy of Ru to H2O and thus shows excellent catalytic activity. The successful preparation and application of Ru NCs@NPC offers a new perspective to the design of advanced bifunctional electrocatalysts.