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        Tri-metal-based hollow nanorods-on-microrod arrays as efficient water splitting electrocatalysts

        Jianzhi Wang,Hongliang Yu,Xianming Wang,Chen Chen,Shuaijie Li,Ning Cai,Weimin Chen,Yanan Xue,Hui Li,Faquan Yu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-

        Constructing ordered hierarchical porous electrocatalysts while maintaining their high efficiency and stabilityfor oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is highly desirable butstill remains challenging. Herein, hierarchical tri-metal-based hollow nano/micro rod-on-rod array structures,including hydroxides and phosphates, are vertically grown on Cu foam by the cation-exchangingand anion exchanging approaches. Such ordered porous architecture, providing multi metal center, regularinterconnection of macropore channel, large electrochemical surface area, small charge-transferresistance, efficient mass transport and electron transfer for overall water splitting in alkaline media. These obtained hydroxide OER catalysts (CoMn LDH@Cu(OH)2/CF) and phosphide HER catalysts(CoMnP@Cu3P/CF) exhibited low onset potential, low Tafel slope, and prominent durability. Such excellentperformance, ordered porous structure and simple preparation methods indicate that this study providesa new strategy for assembling promising catalysts for water splitting and other applications.

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