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<p>Sluggish water dissociation kinetics in the alkaline hydrogen evolution reaction (HER) continue to hamper its practical production. Herein, a class of heterojunction electrocatalyst featuring Ru-Ni(OH)<sub>2</sub> interfaces on nickel foam (NF) with self-engineered built-in electric fields (BIEF) has been synthesized via a simple <i>in situ</i> galvanic replacement reaction. The as-made hierarchical architecture of Ru-Ni (OH)<sub>2</sub>/NF exhibits a record overpotential of 9.6 mV at a current density of 10 mA cm<sup>−2</sup> for alkaline HER, surpassing most reported catalysts and the commercial Pt/C benchmark. Furthermore, it also reveals exceptional catalytic activity towards hydrazine oxidation reaction (HzOR) at 100 mA cm<sup>−2</sup> with a remarkably low potential of <i>ca.</i> 0.015 V vs. RHE (reversible hydrogen electrode). The assembled overall hydrazine splitting (OHzS) system integrating HER and HzOR requires a cell voltage of about 0.09 V to reach 50 mA cm<sup>−2</sup>, which is 1.637 V lower than the corresponding overall water splitting (OWS) device. Systematic analysis and calculation reveal that the BIEF induces the redistribution of interfacial electrons for Ru, facilitating H<sub>2</sub>O dissociation and intermediates conversion to deliver the ultra-high electrocatalytic performance. This work provides an avenue for the design and preparation of electric field-mediated catalysts towards sustainable energy conversion.</p>

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Facile construction of self-supported Ru-Ni(OH)2 with built-in interfacial electric field for accelerating hydrogen evolution

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Jianli Yu,
  • Yongli Shen,
  • Pei Zhu,
  • Lina Li,
  • Changhua An

摘要

Sluggish water dissociation kinetics in the alkaline hydrogen evolution reaction (HER) continue to hamper its practical production. Herein, a class of heterojunction electrocatalyst featuring Ru-Ni(OH)2 interfaces on nickel foam (NF) with self-engineered built-in electric fields (BIEF) has been synthesized via a simple in situ galvanic replacement reaction. The as-made hierarchical architecture of Ru-Ni (OH)2/NF exhibits a record overpotential of 9.6 mV at a current density of 10 mA cm−2 for alkaline HER, surpassing most reported catalysts and the commercial Pt/C benchmark. Furthermore, it also reveals exceptional catalytic activity towards hydrazine oxidation reaction (HzOR) at 100 mA cm−2 with a remarkably low potential of ca. 0.015 V vs. RHE (reversible hydrogen electrode). The assembled overall hydrazine splitting (OHzS) system integrating HER and HzOR requires a cell voltage of about 0.09 V to reach 50 mA cm−2, which is 1.637 V lower than the corresponding overall water splitting (OWS) device. Systematic analysis and calculation reveal that the BIEF induces the redistribution of interfacial electrons for Ru, facilitating H2O dissociation and intermediates conversion to deliver the ultra-high electrocatalytic performance. This work provides an avenue for the design and preparation of electric field-mediated catalysts towards sustainable energy conversion.