Hydrogen energy has become one of the most promising substitutes for conventional fuels because of its high calorific value and green and renewable advantages. Among various hydrogen production strategies, the water splitting hydrogen production strategy stands out. Therefore, it is very important to develop efficient and cheap oxygen evolution reaction (OER) electrocatalysts for hydrogen production by electrolysis of water. In this work, nickel selenide grown on nickel foam (NF) with good electrical conductivity and excellent catalytic performance, i.e. NiSe_x/NF, was selected as the three-dimensional conducting substrate, and the active material ZIF-67 was successfully compounded on the conductive substrate by using the in situ growth strategy. A series of self-supporting materials ZIF-67/NiSe_x/NF were obtained, which can be directly used as working electrodes for the electrocatalytic OER. The self-supporting material ZIF-67/NiSe_x/NF-1 can achieve a low overpotential of 353 mV at a current density of 100 mA cm⁻² with a small Tafel slope of 107 mV dec⁻¹, and excellent stability for 55 hours of continuous OER at a current density of 50 mA cm⁻² in an alkaline medium. Benefiting from the unique layered structure and the synergy between Co and Se optimizing the electronic structure, ZIF-67/NiSe_x/NF-1 when used directly as an electrode shows exceptional OER catalytic performance at high current density.

中文翻译：

---

源自 ZIF-67 的纳米片阵列在三维框架上生长，用于电催化析氧反应


氢能因其高热值以及绿色和可再生的优势，已成为传统燃料最有前途的替代品之一。在各种制氢策略中，水分解氢生产策略脱颖而出。因此，开发高效且廉价的析氧反应 （OER） 电催化剂以通过电解水制氢非常重要。本工作选择生长在导电性好、催化性能优异的泡沫镍（NF）上的硒化镍，即NiSe_x/NF作为三维导电衬底，利用原位生长策略，在导电衬底上成功复合活性材料ZIF-67。获得了一系列自立材料 ZIF-67/NiSe_x/NF，可直接用作电催化 OER 的工作电极。自支撑材料 ZIF-67/NiSe_x/NF-1 可以在 100 mA ^cm-2 的电流密度下实现 353 mV 的低过电位，具有 107 mV ^dec-1 的小塔菲尔斜率，并且在 50 mA ^cm-2 的电流密度下连续 55 小时的 OER 具有出色的稳定性在碱性介质中。得益于独特的层状结构以及 Co 和 Se 之间的协同作用优化了电子结构，ZIF-67/NiSe_x/NF-1 在直接用作电极时在高电流密度下表现出卓越的 OER 催化性能。