Carbon-supported FeCoNiP/FeCoNi Mott-Schottky electrocatalyst for alkaline oxygen evolution reaction
Electrochimica Acta(2023)
摘要
Design of oxygen evolution reaction (OER) electrocatalysts with advanced composition and structure is essential for achieving highly efficient water splitting. Herein, we fabricated a Mott-Schottky electrocatalyst composed of trimetallic alloy and its phosphide (FeCoNiP/FeCoNi) on network-like carbon support. The catalyst was synthesized via a NaCl-template method followed by high-tempreture pyrolysis and low-tempreture phosphorization process. By optimization of the carbonization temperature, the electrocatalyst achieved a ultralow overpotential of 240 mV at 10 mA/cm2 and 302 mV at 100 mA/cm2 for OER, the most excellent OER performance in reported metallic phosphide catalysts and related heterojunction catalysts. The FeCoNiP/FeCoNi Mott-Schottky heterojunction enhanced the mass adsorption and electron transfer in the OER process, responsible for the excellent electrocatalytic activity. Meanwhile, the FeCoNiP on the surface endowed the catalyst good long-term durability in the alkaline electrolyte, even at 10 mA/cm2 for 40 h Our work provided a universal strategy for convenient and controllable synthesis of multi-component Mott-Schottky catalysts, the excellent electrocatalysis performance of which throw new light on the further practical applications.
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关键词
Iron-group trimetallic phosphide catalyst, Mott-Schottky heterojunction, Oxygen evolution reaction, Hydrophilicity, Electronic transfer
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