Designing a simple method to prepare a binder- and carbon-free catalyst with a highly efficient and stable hydrogen evolution electro-catalytic performance in the alkaline media is necessary and urgent. Herein, we develop a low-temperature hydrothermal nitridation and crystal transformation process for the preparation of nitrogen-doped Ni(OH)₂ nanobelts decorated on 3D Ni foam (N-Ni(OH)₂/NF), where the precursor of amorphous Ni(OH)₂/3D Ni foam is fabricated by a simple electrodeposition process. The hydrogen evolution process of our N-Ni(OH)₂/NF electrode is studied by using a classical three-electrode electrochemical measurement in the alkaline media. The as-prepared N-Ni(OH)₂/NF electrode exhibits a small onset overpotential of 178 mV at 100 mA·cm⁻² along with the superior electro-catalytic durability and stability after 10,000 cycles and 24-h continuous operation. The good electrocatalytic hydrogen evolution performance of the N-Ni(OH)₂/NF electrode may be attributed to the absence of inactive materials (conducting carbon and binder), the high electrochemical active sites with a double-layer capacitance (C_dl) of 9.33 mF·cm⁻², the doping effect of nitrogen atom into Ni(OH)₂ crystalline, and the crystal transformation of Ni(OH)₂. More importantly, this strategy may be used to modify other transition metal oxides/hydroxides/sulfides/phosphides/selenides for the improved electrocatalytic hydrogen evolution performance.

设计一种简单的方法来制备在碱性介质中具有高效和稳定的氢释放电催化性能的无粘结剂和无碳催化剂是必要和紧迫的。本文中，我们开发了一种低温水热氮化和晶体转化工艺，用于制备在3D Ni泡沫（N-Ni（OH）₂ / NF）上装饰的掺氮Ni（OH）₂纳米带，其中非晶Ni的前体（OH）₂ / 3D Ni泡沫是通过简单的电沉积工艺制成的。通过在碱性介质中使用经典的三电极电化学测量方法，研究了我们的N-Ni（OH）₂ / NF电极的析氢过程。制备的N-Ni（OH）₂/ NF电极在100 mA·cm ^{-2的条件下}展现出178 mV的小起始过电位，并且在10,000次循环和24小时连续运行后具有出色的电催化耐久性和稳定性。N-Ni（OH）₂ / NF电极的良好电催化氢释放性能可能归因于不存在惰性材料（导电碳和粘合剂），具有双电层（C _dl）的高电化学活性位9.33μF的·厘米^-2，氮原子的掺杂效应成的Ni（OH）₂的结晶，和Ni的晶体转化（OH）₂。更重要的是，该策略可用于修饰其他过渡金属氧化物/氢氧化物/硫化物/磷化物/硒化物，以改善电催化氢的逸出性能。