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Urchin-Type Architecture Assembled by Cobalt Phosphide Nanorods Encapsulated in Graphene Framework as an Advanced Anode for Alkali Metal Ion Batteries |
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| Authors: | Jiamei Wang Gang Zhu Zelei Zhang Dr Yi Wang Prof Hui Wang Prof Jintao Bai Prof Gang Wang |
| Institution: | 1. State Key Laboratory of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi'an, 710127 China
Shaanxi Joint Lab of Graphene, Northwest University, Xi'an, 710127 China These authors contributed equally to this work.;2. School of Chemical Engineering, Xi'an University, Xi'an, 710065 China These authors contributed equally to this work.;3. State Key Laboratory of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi'an, 710127 China Shaanxi Joint Lab of Graphene, Northwest University, Xi'an, 710127 China;4. State Key Laboratory of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi'an, 710127 China;5. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry (Ministry of Education), College of Chemistry & Materials Science, Northwest University, Xi'an, 710127 China Shaanxi Joint Lab of Graphene, Northwest University, Xi'an, 710127 China |
| Abstract: | Urchin-type cobalt phosphide microparticles assembled by nanorod were encapsulated in a graphene framework membrane (CoP@GF), and used as a binder-free electrode for alkali metal ion batteries. Electrochemical measurements indicate that this membrane exhibits enhanced reversible lithium, sodium, and potassium storage capabilities. Moreover, the energy storage properties of CoP@GF electrodes in alkali metal ion batteries display an order of Li>Na>K. DFT calculations on adsorption energy of CoP surfaces for Li, Na, and K indicated that CoP surfaces were more favorable to transfer electrons to Li atoms than Na and K, and the surface reactivity can be ordered as Li-CoP>Na-CoP>K-CoP; thus, CoP@GF exhibits better storage capacity for lithium. This work provides experimental and theoretical basis for understanding the electrochemical performance of cobalt phosphide-based membranes for alkali metal ion batteries. |
| Keywords: | alkali metal ion batteries cobalt phosphide graphene frameworks hybrid membrane theoretical study |