Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
Adv Mater. 2023 Jun;35(23):e2301533. doi: 10.1002/adma.202301533. Epub 2023 Apr 25.
Hydrazine-assisted water electrolysis offers a feasible path for low-voltage green hydrogen production. Herein, the design and synthesis of ultrathin RhRu -alloy wavy nanowires as bifunctional electrocatalysts for both the anodic hydrazine oxidation reaction (HzOR) and the cathodic hydrogen evolution reaction (HER) is reported. It is shown that the RhRu -alloy wavy nanowires can achieve complete electrooxidation of hydrazine with a low overpotential and high mass activity, as well as improved performance for the HER. The resulting RhRu bifunctional electrocatalysts enable, high performance hydrazine-assisted water electrolysis delivering a current density of 100 mA cm at an ultralow cell voltage of 54 mV and a high current density of 853 mA cm at a cell voltage of 0.6 V. The RhRu electrocatalysts further demonstrate a stable operation at a high current density of 100 mA cm for 80 hours of testing period with little irreversible degradation. The overall performance greatly exceeds that of the previously reported hydrazine-assisted water electrolyzers, offering a pathway for efficiently converting hazardous hydrazine into molecular hydrogen.
水肼辅助电解提供了一种可行的低电压绿色制氢途径。在此，报告了超薄 RhRu 合金波浪纳米线作为析氢反应 (HER) 和肼氧化反应 (HzOR) 双功能电催化剂的设计和合成。结果表明，RhRu 合金波浪纳米线可以实现肼的完全电氧化，具有低过电位和高质量活性，以及对 HER 的性能提高。所得 RhRu 双功能电催化剂能够实现高性能的水肼辅助水电解，在超低 54 mV 电池电压下可提供 100 mA cm 的电流密度，在 0.6 V 电池电压下可提供 853 mA cm 的高电流密度。RhRu 电催化剂在 100 mA cm 的高电流密度下进一步展示了 80 小时的稳定运行，几乎没有不可逆的降解。整体性能大大超过了先前报道的水肼辅助水电解槽，为有效转化危险的水肼成分子氢提供了一条途径。
