Transition metal phosphides are promising candidates for alkaline hydrogen evolution reaction (HER), but the activation of H₂O molecule is deficient. We adopt an interface engineering strategy to synthesize a hierarchical FeNiP/MoO_x integrated electrode with multi-interface grown on monocrystalline NiMoO₄ nanorods. Such catalyst exhibits remarkable alkaline HER performance with a low overpotential of 97 mV at the current density of 100 mA cm⁻² and sustainable durability over 20 h. Experimental and theoretical results reveal that interfaces among Fe₂P, Ni₅P₄, and MoO_x can efficiently activate H₂O molecules and facilitate H desorption. Moreover, employing FeNiP/MoO_x/NiMoO₄/NF as a cathode, the cell voltage as low as 1.62 V to achieve a current density of 100 mA cm⁻², with admirable durability over 20 h for alkaline water splitting (1.0 M NaOH + 0.5 M NaCl). This work offers a new avenue to rationally design a 3D robust, cost-effective catalyst with multi-interface for large-scale practical hydrogen production.

过渡金属磷化物是碱性析氢反应 (HER) 的有希望的候选者，但 H ₂ O 分子的活化不足。我们采用界面工程策略来合成具有多界面的分层 FeNiP/MoO _x集成电极，该电极在单晶 NiMoO ₄纳米棒上生长。这种催化剂表现出显着的碱性 HER 性能，在 100 mA cm ^-2的电流密度下具有 97 mV 的低过电位和超过 20 小时的可持续耐久性。实验和理论结果表明，Fe ₂ P、Ni ₅ P ₄和 MoO _x之间的界面可以有效地激活 H ₂O 分子并促进 H 解吸。此外，采用 FeNiP/MoO _x /NiMoO ₄ /NF 作为阴极，电池电压低至 1.62 V 以实现 100 mA cm ^-2的电流密度，在碱性水分解（1.0 M NaOH + 0.5 M 氯化钠）。这项工作为合理设计具有多界面的 3D 坚固、经济高效的催化剂提供了一条新途径，用于大规模实际制氢。