Embedding Co2P nanoparticles into co-doped carbon hollow polyhedron as a bifunctional electrocatalyst for efficient overall water splitting |
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| Affiliation: | 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. School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, LiuFang Campus, Wuhan, 430205, Hubei Province, PR China;2. Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, Hubei Province, PR China;3. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, Henan Province, PR China;1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China;2. College of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, PR China;3. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, PR China;4. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR 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 Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China;2. Key Laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals, Changsha, 410083, China;3. Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario, N6A 5B9, Canada;4. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha, 410083, China |
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| Abstract: | The reasonable design and construction of non-precious metal electrocatalysts with low cost and high performance is critical for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, a facile polymerization-pyrolysis method is proposed to encapsulate Co2P nanoparticles in co-doped hollow carbon shell by using ZIF-67 and P-containing polymers as precursor. The unique construction not only effectively prevents nanoparticles from detaching, showing good stability after long-term testing, but also provides abundant active sites, large surface areas and large pore volumes, enabling the electrolyte and electrode material to full contact. As expected, the Co2P/NPSC-800 performs superior HER performance with low overpotential of 173 mV at 10 mA cm−2 and excellent stability of 88% retention for 35 h and OER performance with low overpotential of 320 mV at 10 mA cm−2, which endows Co2P/NPSC-800 with good catalytic activity in overall water splitting. Furthermore, density functional theory (DFT) calculations reveal that the metallic property and the decreased reaction barriers of Co2P can promote the catalytic reactions. This work offers an effective route in synthesizing other transition metal phosphides with high catalytic properties. |
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| Keywords: | ZIF-67 P-containing polymers Co-doping Overall water splitting |
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