Ni₂P has been intensively investigated for hydrogen evolution reaction (HER) in recent years since the HER activity of Ni₂P (001) is theoretically superior to Pt. Most of these works have focused on acid system as Ni₂P is unstable in alkaline media. However, alkaline water splitting is more practical for industry due to the lack of suitable acidic oxygen evolution catalyst. Thus, providing an efficient alkaline HER catalyst by enhancing the stability and activity of Ni₂P is needed. Herein, we have grown mesoporous (Fe_xNi_1-x)₂P nanosheets on Ni foam (NF) as HER catalyst with activities being related to Fe/Ni ratio. FeNiP/NF with Fe/Ni ratio of 5/5 and high-density exposure of (001) surface shows much better stability and HER activity in alkaline than Ni₂P. Our experimental results reveal that the homogeneous lattice substitution of Fe modified the electronic structure of Ni₂P, enhanced the intrinsic activity and the number of active sites. Density functional theory calculation reveals that the Fe incorporation improves the HER activity of the highly exposed FeNiP (001) surface by reducing the energy barriers of HER reactants (H and H₂O) adsorption compared with Ni₂P. This work provides an effective pathway for the future development of HER catalyst in alkaline conditions by introducing hetero-atom into the host lattice.

倪₂ P已被深入研究以来的HER镍活性近年来析氢反应（HER）₂ P（001）是理论上优于铂。这些工作大多数都集中在酸体系上，因为Ni ₂ P在碱性介质中不稳定。然而，由于缺乏合适的酸性氧释放催化剂，碱性水分解在工业上更实用。因此，需要通过增强Ni ₂ P的稳定性和活性来提供有效的碱性HER催化剂。在此，我们已经生长了介孔（Fe _x Ni _1-x）₂Ni泡沫（NF）作为HER催化剂的P纳米片，其活性与Fe / Ni比有关。Fe / Ni比为5/5且高密度暴露（001）表面的FeNiP / NF与Ni ₂ P相比，在碱性条件下表现出更好的稳定性和HER活性。我们的实验结果表明，Fe的均匀晶格取代修饰了电子。 Ni ₂ P的结构，提高了固有活性和活性位点的数量。密度泛函理论计算表明，与Ni ₂相比，Fe的掺入通过减少HER反应物（H和H ₂ O）吸附的能垒，提高了高度暴露的FeNiP（001）表面的HER活性。P.这项工作通过将杂原子引入主体晶格，为在碱性条件下HER催化剂的未来开发提供了有效的途径。