Constructing heterointerface engineering has becoming an effective and general strategy for developing highly efficient and durable nonnoble electrocatalysts for catalyzing both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In this work, we synthesized a self-supporting heterogeneous NiSe@Co0.85Se/NF electrocatalyst using a facile in situ selenization of transition metal precursors that coated on the nickel foam (NF) in polyol solution. The NF was used as both conductive substrate and nickel source, ensuring superior electronic conductivity for catalyzing. The NiSe@Co0.85Se/NF exhibited remarkable bifunctional electrocatalytic activities with HER overpotential of 168 mV and OER overpotential of 258 mV to achieve 10 mA·cm−2. The water splitting system using NiSe@Co0.85Se/NF as both anode and cathode electrodes achieved a current density of 10 mA·cm−2 at 1.61 V with nearly 100% faradaic efficiency and impressively long-term stability. The efficient bifunctional catalytic performance of NiSe@Co0.85Se/NF should be attributed to the electronic modulation and synergistic effect between NiSe and Co0.85Se, the intrinsic metallic conductivity and the enlarged active sites exposure. This work provides a facile method for developing heterogeneous bifunctional catalysts for advanced electrochemical energy conversion technologies.

中文翻译：

---

NiSe@Co0.85Se异质界面结构的原位生长与泡沫镍上的电子调制用于整体水分解

构建异质界面工程已成为开发高效且耐用的非贵金属电催化剂以催化析氢反应 (HER) 和析氧反应 (OER) 的有效且通用的策略。在这项工作中，我们使用在多元醇溶液中涂覆在镍泡沫 (NF) 上的过渡金属前体的简单原位硒化合成了一种自支撑异质 NiSe@Co0.85Se/NF 电催化剂。NF 既用作导电基材又用作镍源，确保催化时具有优异的电子导电性。NiSe@Co0.85Se/NF表现出显着的双功能电催化活性，HER过电位为168 mV，OER过电位为258 mV，达到10 mA·cm-2。使用 NiSe@Co0 的水分解系统。85Se/NF 作为阳极和阴极电极在 1.61 V 下实现了 10 mA·cm-2 的电流密度，具有接近 100% 的法拉第效率和令人印象深刻的长期稳定性。NiSe@Co0.85Se/NF 的高效双功能催化性能应归因于 NiSe 和 Co0.85Se 之间的电子调制和协同效应、固有的金属导电性和扩大的活性位点暴露。这项工作为开发用于先进电化学能量转换技术的多相双功能催化剂提供了一种简便的方法。固有的金属导电性和扩大的活性位点暴露。这项工作为开发用于先进电化学能量转换技术的多相双功能催化剂提供了一种简便的方法。固有的金属导电性和扩大的活性位点暴露。这项工作为开发用于先进电化学能量转换技术的多相双功能催化剂提供了一种简便的方法。