Interfacial engineering emerges as a potent strategy for regulating the catalytic reactivity of metal phosphides. Developing a facile and cost-effective method to construct bifunctional metal phosphides for highly efficient electrochemical overall water splitting remains an essential and challenging issue. Here, a multiphase transition metal phosphide is constructed through the direct phosphorization of a Ni–Co metal–organic framework grown on nickel foam (Ni–Co-MOF/NF), which is prepared by utilizing nickel foam as conductive substrate and nickel source. The resulting transition metal phosphide manifests a pillar-layered morphology, wherein CoP, Ni₂P, and Ni₅P₄ nanoparticles are embedded within each carbon sheet and these carbon sheets assemble into a pillar-shaped structure on the nickel foam (Ni₂P–Ni₅P₄–CoP–C/NF). The heterogeneous Ni₂P-Ni₅P₄–CoP–C/NF with multiple interfaces serves as a highly efficient bifunctional electrocatalyst with overpotentials of −100 mV and 293 mV in the hydrogen evolution reaction and oxygen evolution reaction, respectively, at 50 mA cm⁻² in alkaline media. This superior catalytic performance should mainly be ascribed to its enriched active centers and multiphase synergy. When directly applied for alkaline overall water splitting, the Ni₂P–Ni₅P₄–CoP–C/NF couple demonstrates satisfactory activity (1.55 V @10 mA cm⁻²) along with sustained durability over 18 hours. This method brings fresh enlightenment to the economical and controllable preparation of multi-metal phosphides for energy conversion.

中文翻译：

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源自金属有机框架的柱状层状 Ni2P-Ni5P4-CoP 阵列作为高效整体水分解的双功能催化剂

界面工程成为调节金属磷化物催化反应活性的有效策略。开发一种简便且经济有效的方法来构建双功能金属磷化物，以实现高效的电化学整体水分解仍然是一个重要且具有挑战性的问题。在这里，通过直接磷化在泡沫镍（Ni-Co-MOF/NF）上生长的镍钴金属有机骨架来构建多相过渡金属磷化物，该框架是利用泡沫镍作为导电基底和镍源制备的。所得过渡金属磷化物表现出柱状层状形态，其中CoP、Ni ₂ P和Ni ₅ P ₄纳米颗粒嵌入每个碳片内，并且这些碳片在泡沫镍上组装成柱状结构（Ni ₂ P –Ni ₅ P ₄ –CoP–C/NF）。具有多个界面的异质Ni ₂ P-Ni ₅ P ₄ –CoP–C/NF作为高效双功能电催化剂，在50 mA的析氢反应和析氧反应中的过电势分别为-100 mV和293 mV cm ^-2在碱性介质中。这种优异的催化性能主要归功于其丰富的活性中心和多相协同作用。当直接应用于碱性整体水分解时，Ni ₂ P–Ni ₅ P ₄ –CoP–C/NF 对表现出令人满意的活性（1.55 V @10 mA cm ^-2）以及超过 18 小时的持续耐久性。该方法为经济可控制备用于能量转换的多金属磷化物带来了新的启示。