Heterostructural Co/CeO2/Co2P/CoP@NC dodecahedrons derived from CeO2-inserted zeolitic imidazolate framework-67 as efficient bifunctional electrocatalysts for overall water splitting |
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| Affiliation: | 1. State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116023, China;2. School of Chemical Engineering, Dalian University of Technology, Panjin, 124221, China;1. State Key Laboratory of Advanced Welding and Joining, School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China;2. State Key Laboratory of Advanced Welding and Joining, School of Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China;1. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China;2. State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;3. Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Ministry of Education, Jilin Normal University, Changchun, 130103, China;1. Key Laboratory of Inorganic Chemistry in Universities of Shandong, Department of Chemistry and Chemical Engineering, Jining University, Qufu, 273155, PR China;2. State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, 53 Zhengzhou Road, 266042, Qingdao, PR China;1. School of Chemical Engineering, School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, PR China;2. Key Laboratory of Photochemical Conversion and Optoelectronic Material, CAS, PR China;3. Hefei Institute of Physical Science, Key Laboratory of Photovoltaic and Energy Conservation Materials, CAS, PR China |
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| Abstract: | The design and fabrication of highly active, robust and cost-efficient electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of great significance towards overall water splitting, but remains challenging as well. Herein, we report, for the first time, heterostructural Co/CeO2/Co2P/CoP@NC dodecahedrons as bifunctional electrocatalyst, in which abundant interfaces are formed between different components. Typical ZIF-67 (ZIF = zeolitic imidazolate framework) dodecahedrons with pre-inserted CeO2 nanowires were selected as precursors to synthesize Co/CeO2/Co2P/CoP@NC via a direct carbonization process followed by phosphidation, simultaneously generating the strong coupled heterojunction interfaces through interactions between CeO2 and CoxP species. Abundant porous structure leads to the exposure of more active sites and the carbon encapsulation of nanodomains sustains the high robustness and conductivity and the synergistic effect between the multi-components heterostructure. Benefiting from the above collective advantages, the Co/CeO2/Co2P/CoP@NC electrocatalysts exhibit small overpotentials of 307 and 195 mV to derive 10 mA cm?2 for OER and HER, respectively. Furthermore, an alkaline electrolyzer assembled by using Co/CeO2/Co2P/CoP@NC as both cathode and anode can achieve a current density of 10 mA cm?2 at a low voltage of 1.76 V and work continuously for over 15 h. This work would provide a rational protocol for fabrication multi-phase interface enriched electrocatalysts toward highly efficient energy conversion. |
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| Keywords: | Metal phosphide Interface engineering Electrocatalysis Water splitting |
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