Wang Tian-Jiao, Xu Guang-Rui, Sun Hui-Ying, Huang Hao, Li Fu-Min, Chen Pei, Chen Yu
Key Laboratory of Macromolecular Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, PR China.
School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, PR China.
Nanoscale. 2020 Jun 4;12(21):11526-11535. doi: 10.1039/d0nr02196b.
Water electrolysis is an environmentally friendly and sustainable technique for ultra-pure hydrogen production, while expensive electrode materials and high driving voltage have seriously hindered its commercialization process. Here, Earth-abundant bifunctional porous Ni2P hollow nanotubes on nickel foam (Ni2P-HNTs/NF) electrocatalysts are synthesized through a facile self-template method and a phosphating process, which are perfectly combined with the hydrazine electrooxidation reaction (HzOR) boosted water electrolysis. Benefiting from the unique structural characteristic of open-framework and abundant step atoms, Ni2P-HNTs/NF achieves 10 mA cm-2 at 91 mV (vs. RHE) for the cathodic hydrogen evolution reaction and 18 mV (vs. RHE) for the anodic HzOR in a three electrode system, respectively. The corresponding two-electrode hydrazine electrolyzer produces 10 mA cm-2 with a total voltage of only 152 mV for ultra-pure hydrogen production, highlighting a cost-effective and energy-saving water electrolysis mode.
水电解是一种用于生产超纯氢的环境友好且可持续的技术，然而昂贵的电极材料和高驱动电压严重阻碍了其商业化进程。在此，通过简便的自模板法和磷化工艺合成了泡沫镍上富含地球元素的双功能多孔Ni2P空心纳米管（Ni2P-HNTs/NF）电催化剂，其与肼电氧化反应（HzOR）促进的水电解完美结合。受益于开放框架的独特结构特征和丰富的台阶原子，Ni2P-HNTs/NF在三电极体系中，阴极析氢反应在91 mV（相对于可逆氢电极，RHE）时达到10 mA cm-2，阳极HzOR在18 mV（相对于RHE）时达到该电流密度。相应的两电极肼电解槽在生产超纯氢时，在总电压仅为152 mV的情况下产生10 mA cm-2的电流密度，突出了一种具有成本效益和节能的水电解模式。
