Wang Hao-Yu, Wang Lei, Ren Jin-Tao, Tian Wen-Wen, Sun Ming-Lei, Yuan Zhong-Yong
School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Nankai University, Tianjin, 300350, People's Republic of China.
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300071, People's Republic of China.
Nanomicro Lett. 2023 Jun 19;15(1):155. doi: 10.1007/s40820-023-01128-z.
Hydrazine-assisted water electrolysis is a promising energy conversion technology for highly efficient hydrogen production. Rational design of bifunctional electrocatalysts, which can simultaneously accelerate hydrogen evolution reaction (HER)/hydrazine oxidation reaction (HzOR) kinetics, is the key step. Herein, we demonstrate the development of ultrathin P/Fe co-doped NiSe nanosheets supported on modified Ni foam (P/Fe-NiSe) synthesized through a facile electrodeposition process and subsequent heat treatment. Based on electrochemical measurements, characterizations, and density functional theory calculations, a favorable "2 + 2" reaction mechanism with a two-step HER process and a two-step HzOR step was fully proved and the specific effect of P doping on HzOR kinetics was investigated. P/Fe-NiSe thus yields an impressive electrocatalytic performance, delivering a high current density of 100 mA cm with potentials of - 168 and 200 mV for HER and HzOR, respectively. Additionally, P/Fe-NiSe can work efficiently for hydrazine-assisted water electrolysis and Zn-Hydrazine (Zn-Hz) battery, making it promising for practical application.
肼辅助水电解是一种很有前景的高效制氢能量转换技术。合理设计能够同时加速析氢反应（HER）/肼氧化反应（HzOR）动力学的双功能电催化剂是关键步骤。在此，我们展示了通过简便的电沉积工艺和后续热处理合成的负载在改性泡沫镍上的超薄P/Fe共掺杂NiSe纳米片（P/Fe-NiSe）的制备。基于电化学测量、表征和密度泛函理论计算，充分证明了一种有利的“2 + 2”反应机理，即两步析氢过程和两步肼氧化过程，并研究了P掺杂对肼氧化反应动力学的具体影响。P/Fe-NiSe因此展现出令人印象深刻的电催化性能，在析氢反应和肼氧化反应中分别在-168和200 mV的电位下实现了100 mA cm的高电流密度。此外，P/Fe-NiSe可有效地用于肼辅助水电解和锌-肼（Zn-Hz）电池，具有实际应用前景。
