Hydrogen generation from water splitting is of great prospect for the sustainable energy conversion. However, it is still challenging to explore stable and high-performance electrocatalysts toward hydrogen evolution reaction (HER) from saline water such as seawater due to the chloride corrosion. Herein, we developed a self-supported heterogeneous bimetallic phosphide (Ni₂P-FeP) array electrode that possesses excellent HER performance in alkaline saline water with an overpotential of 89 mV at 10 mA·cm⁻² and long-term stability over 90 h at 200 mA·cm⁻². The analysis showed that the heterostructure between the interfaces of Ni₂P-FeP plays a pivotal role in promoting the activity of catalyst. Moreover, the bimetallic phosphide nanoarrays can be employed as a shield for chlorine-corrosion resistance in the saline water, ensuring the long-term durability of hydrogen generation. When employed for alkaline saline water electrolysis, a current density of 100 mA·cm⁻² is achieved at cell voltage of 1.68 V. This work presents an effective approach for the fabrication of high-performance electrode for HER in alkaline saline environments.

水分解制氢对于可持续能源转换具有广阔的前景。然而，由于氯化物腐蚀，从盐水（如海水）中探索稳定和高性能的析氢反应（HER）电催化剂仍然具有挑战性。在此，我们开发了一种自支撑的异质双金属磷化物（Ni ₂ P-FeP）阵列电极，该电极在碱性盐水中具有优异的 HER 性能，在 10 mA·cm ^-2下具有 89 mV 的过电位和超过 90 小时的长期稳定性。在 200 mA·cm ^-2。分析表明，Ni _{2界面间的异质结构}P-FeP在促进催化剂活性方面起着举足轻重的作用。此外，双金属磷化物纳米阵列可用作盐水中耐氯腐蚀的屏障，确保氢气产生的长期耐久性。当用于碱性盐水电解时，在 1.68 V 的电池电压下可实现 100 mA·cm ^-2的电流密度。这项工作为在碱性盐水环境中制备高性能 HER 电极提供了一种有效的方法。