Developing cost-effective and earth-abundant noble-metal-free oxygen evolution reaction (OER) electrocatalysts with high activity and durability is highly desirable for future renewable energy systems. Herein, we develop a facile and controllable approach to engineer a series of structurally tiered bimetallic Ni–Fe phosphide nanocomposites with well-designed architectures and compositions through the topological conversion of the flowerlike precursor of Ni–Fe layered double hydroxides (LDHs). Remarkably, benefitting from their special physicochemical features and desirable synergistic effect, the resultant bimetallic phosphides can serve as a class of advanced high-performance electrocatalysts for water oxidation with an extremely low overpotential of 233 mV to deliver a current density of 10 mA cm⁻², a small Tafel slope of 42.5 mV dec⁻¹, and strong durability (30 h of continuous water electrolysis), favourably representing the state-of-the-art level. This work elucidates the promising electrocatalytic performance of multinary transition-metal phosphides with controlled structures and compositions derived from LDHs for the OER.

中文翻译：

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具有受控结构和成分的双金属Ni-Fe磷化物纳米复合材料，可实现高效的电化学水氧化†

对于未来的可再生能源系统，非常需要开发具有成本效益且富含地球的无贵金属的无氧析出反应（OER）电催化剂。本文中，我们开发了一种简便且可控的方法，通过对镍铁层状双氢氧化物（LDHs）的花状前体进行拓扑转化，设计出一系列结构良好的结构和成分的结构分层的双金属镍铁磷化物纳米复合材料。值得注意的是，得益于其特殊的理化特性和理想的协同作用，所得双金属磷化物可作为一类用于水氧化的高级高性能电催化剂，其超低电势为233 mV，可提供10 mA cm ^-2的电流密度，Tafel斜率小，为42.5 mV dec ^-1，并且具有很强的耐用性（连续水电解30 h），可以很好地代表最新技术水平。这项工作阐明了具有受控结构和组成的，用于OER的LDH组成的多元过渡金属磷化物的有希望的电催化性能。