Three-dimensional hierarchical ZnCo2O4 flower-like microspheres assembled from porous nanosheets: Hydrothermal synthesis and electrochemical properties |
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| Affiliation: | 1. School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, United States;2. Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China;3. Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical, Engineering, Lanzhou University, Lanzhou 730000, P. R. China;1. School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, PR China;2. Engineering Research Center of Materials and Technology for Electrochemical Energy Storage (Ministry of Education), Guangzhou 510006, PR China;3. Laboratory of Quantum Information Technology, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, PR China;1. School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, PR China;2. Engineering Research Center of Materials and Technology for Electrochemical Energy Storage (Ministry of Education), Guangzhou 510006, PR China;3. Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, PR China;4. Guangdong Engineering Technology Research Center of Low Carbon and Advanced Energy Materials, Guangzhou 510631, PR China;1. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei University, Wuhan 430068, PR China;2. School of Life Sciences, Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei University, Wuhan 430068, PR China;3. College of Chemistry and Chemical Engineering, Hubei Key Laboratory of Pollution Analysis & Reuse Technology, Hubei Normal University, Huangshi, 435002, PR China;4. Institute for Superconducting & Electronic Materials, University of Wollongong, NSW 2522, Australia |
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| Abstract: | In this work, three-dimensional hierarchical ZnCo2O4 flower-like microspheres have been synthesized on a large scale via a facile and economical citrate-mediated hydrothermal method followed by an annealing process in air. The as-synthesized ZnCo2O4 flower-like microspheres are constructed by numerous interweaving porous nanosheets. According to the experimental results, a formation mechanism involving the assembly of the nanosheets from nanoparticles into flower-like microsphere is proposed. As a virtue of their beneficial structural features, the ZnCo2O4 flower-like microspheres exhibit a high lithium storage capacity and excellent cycling stability (1136 mA h g?1 at 100 mA g?1 after 50 cycles). This remarkable electrochemical performance can be ascribed to the hierarchical structure and porous structures in the nanosheets, which effectively increases the contact area between the active materials and the electrolyte, shortening the Li+ diffusion pathway and buffering the volume variation during cycling. |
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| Keywords: | Hydrothermal synthesis Nanosheets Electrochemical performance |
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