As the energy and ecological crises are increasingly grim, it is challengeable but extremely attractive to fabricate highly efficient and low-cost bifunctional electrocatalysts for overall water splitting (OWS). Herein, a bimetallic phosphide embedded in -doped hierarchical porous carbon (CoP/NiP@NHPC) framework was successfully constructed by calcination and phosphorization of cobalt–nickel coordination polymer nanoflowers (Co/Ni CPNFs), which were obtained by a facile hydrothermal process. Benefitting from their fascinating architecture and composition, the as-prepared CoP/NiP@NHPC exhibits outstanding electrochemical properties for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) with small Tafel slopes (103.9 mV dec, 62.58 mV dec) and ultralow overpotentials (275 mV, 159 mV at 10 mA cm) in alkaline medium. Additionally, the CoP/NiP@NHPC can be used as a bifunctional catalyst in a two-electrode water splitting device, and it only requires a low cell voltage of 1.55 V to attain the current density of 10 mA cm. Meanwhile, the CoP/NiP@NHPC also present admirable durability (at least 20 h) under long-term electrolysis. This work gives inspiration for the preparation of highly active bifunctional electrocatalysts for OWS.

中文翻译：

---

3D分层多孔氮掺杂碳纳米结构涂层双金属磷化物作为高效双功能电催化剂用于整体水分解

随着能源和生态危机日益严峻，制造高效、低成本的全水分解（OWS）双功能电催化剂具有挑战性，但极具吸引力。在此，通过对钴镍配位聚合物纳米花（Co/Ni CPNFs）进行煅烧和磷化，成功构建了嵌入掺杂分级多孔碳（CoP/NiP@NHPC）框架的双金属磷化物，该纳米花是通过简便的水热工艺获得的。得益于其迷人的结构和组成，所制备的 CoP/NiP@NHPC 在析氧反应 (OER) 和析氢反应 (HER) 方面表现出出色的电化学性能，具有较小的塔菲尔斜率（103.9 mV dec、62.58 mV dec）和在碱性介质中具有超低过电势（10 mA cm 时为 275 mV、159 mV）。此外，CoP/NiP@NHPC可用作双电极水分解装置中的双功能催化剂，仅需要1.55 V的低电池电压即可获得10 mA cm的电流密度。同时，CoP/NiP@NHPC在长期电解下也表现出令人赞叹的耐久性（至少20小时）。这项工作为制备用于OWS的高活性双功能电催化剂提供了启发。