Given the current shortage of resources and environmental pollution, rationally designing and developing low-cost and high-efficiency bifunctional electrocatalysts is an urgent and challenging task. It is widely recognized that element doping can effectively improve the electrocatalytic activity by adjusting the microstructure, morphology, and electronic structure. Therefore, this work rationally designs and prepares three-dimensional flower-like structured W-doped FeNi₂S₄/Ni₃S₂/NF heterojunctions as efficient bifunctional electrocatalysts for overall water splitting. In 1 M KOH, the prepared W-FeNi₂S₄/Ni₃S₂/NF electrocatalyst can effectively drive both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) processes, and only needs overpotentials of 93 and 210 mV to reach current densities of 10 and 50 mA·cm⁻². In the double electrode cell composed by W-FeNi₂S₄/Ni₃S₂/NF electrocatalyst, a low cell voltage of 1.52 V was required to reach a current density of 10 mA·cm⁻², and 91.6% of this value was preserved after 24 h electrolysis operation. The performance of FeNi₂S₄/Ni₃S₂/NF electrocatalyst is superior to most of the current bifunctional electrocatalytic materials. Density functional theory (DFT) theoretical calculations also revealed a more intense electron transfer process that can be facilitated by constructing FeNi₂S₄ and Ni₃S₂/NF interface, which may be the main reason for the archived excellent electrochemical performance.

在当前资源紧缺和环境污染严重的情况下，合理设计和开发低成本、高效率的双功能电催化剂是一项紧迫而具有挑战性的任务。人们普遍认为，元素掺杂可以通过调整微观结构、形貌和电子结构来有效提高电催化活性。因此，本工作合理设计并制备了三维花状结构W掺杂FeNi ₂ S ₄ /Ni ₃ S ₂ /NF异质结作为高效双功能电催化剂用于全分解水。在 1 M KOH 中，制备的 W-FeNi ₂ S ₄ /Ni ₃ S ₂/NF电催化剂可有效驱动析氢反应（HER）和析氧反应（OER）过程，仅需93和210 mV的过电势即可达到10和50 mA·cm -2 的电流^密度。_{在W-FeNi 2} S ₄ /Ni ₃ S ₂ /NF电催化剂组成的双电极电池中，需要1.52 V的低电池电压才能达到10 mA·cm ^-2的电流密度，并且该值的91.6%电解操作 24 h 后保存。_{FeNi 2} S ₄ /Ni ₃ S ₂的性能/NF电催化剂优于目前大多数双功能电催化材料。_{密度泛函理论（DFT）理论计算还揭示了通过构建FeNi 2} S ₄和Ni ₃ S ₂ /NF界面可以促进更强烈的电子转移过程，这可能是获得优异电化学性能的主要原因。