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首页> 外文期刊>Advanced Functional Materials >Hybrid Organic-Inorganic Transition-Metal Phosphonates as Precursors for Water Oxidation Electrocatalysts
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Hybrid Organic-Inorganic Transition-Metal Phosphonates as Precursors for Water Oxidation Electrocatalysts

机译：杂化有机-无机过渡金属膦酸酯作为水氧化电催化剂的前体

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摘要

Efficient water oxidation catalysts are required for the development of water splitting technologies. Herein, the synthesis of layered hybrid NiFe-phenylphosphonate compounds from metal acetylacetonate precursors and phenylphosphonic acid in benzyl alcohol, and their oxygen evolution reaction performance in alkaline medium, are reported. The hybrid particles are formed by inorganic layers of NiO6 and FeO6 distorted octahedra separated by bilayers of the organic group, and template the formation in situ of NiFe hydroxide nanosheets of sizes between 5 and 25 nm and thicknesses between 3 and 10 nm. X-ray absorption spectroscopy measurements suggest that the hybrid also acts as a template for the local structure of the metal sites in the active catalyst, which remain distorted after the transformation. Optimum electrocatalytic activity is achieved with the hybrid compound with a Fe content of 16%. The combination of the synergistic effect between Ni and Fe with the structural properties of the hybrid results in an efficient catalyst that generates a current density of 10 mA cm(-2) at an overpotential of 240 mV, and also in a stable catalyst that operates continuously at low overpotentials for 160 h.
机译：开发水分解技术需要有效的水氧化催化剂。在此，报道了由金属乙酰丙酮化物前体和苯基膦酸在苄醇中合成层状杂化的NiFe-苯基膦酸酯化合物，以及它们在碱性介质中的氧释放反应性能。杂化颗粒是由扭曲的八面体的NiO6和FeO6的无机层（由有机基团的双层隔开）形成的，并原位形成尺寸为5至25 nm，厚度为3至10 nm的NiFe氢氧化物纳米片。 X射线吸收光谱法测量表明，该杂化物还充当活性催化剂中金属位点的局部结构的模板，该金属位点在转化后仍然变形。 Fe含量为16％的杂化化合物可实现最佳的电催化活性。镍和铁之间的协同效应与杂化物的结构特性相结合，产生了一种有效的催化剂，该催化剂在240 mV的超电势下产生10 mA cm（-2）的电流密度，并且还可以稳定运行在低超电势下持续160 h。

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