Ce-Doped Ordered Mesoporous Cobalt Ferrite Phosphides as Robust Catalysts for Water Oxidation |
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Authors: | Yarong Huang Menggang Li Weiwei Yang Yongsheng Yu Sue Hao |
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Institution: | MIIT Key Laboratory of Critical Materials Technology for, New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001 P.R. China |
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Abstract: | Controllable synthesis and rational design of ordered nanostructures are crucial for their renewable energy applications. In this work, a mesoporous CoP/Fe2P doped with 5 % Ce by a simple nanocasting method is designed as a superior electrocatalyst for the oxygen evolution reaction (OER). The well-designed composite delivers an efficient electrocatalytic activity with a low overpotential of 250 mV at 10 mA cm?2 and excellent long-term stability with no degradation after 10 h of electrochemical OER test, superior to that of the state-of-the-art RuO2 electrocatalyst in alkaline electrolyte. A comprehensive analysis demonstrates that the outstanding OER performance is due to the desirable combination of the highly exposed active centers in the Ce-doped bimetallic phosphides, efficient mass transfer, and effective electron conduction owing to the hierarchically mesoporous hybridization. Furthermore, the synergistic effect between Ce and CoP/Fe2P accelerates the migration rate of electrons/ions and increases the electrochemical active area. This excellent OER performance observed by Ce doping of CoP/Fe2P makes them possible candidates toward OER in alkaline electrolytes. |
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Keywords: | Ce doping mesoporous structures oxygen evolution reactions transition metal phosphides |
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