Hierarchical porous carbon/selenium composites derived from abandoned paper cup as Li-Se battery cathodes |
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| Institution: | 1. College of Chemistry & Materials, LongYan University, Fujian, LongYan, 364012, China;2. Fujian Provincial Key Laboratory of Clean Energy Materials, LongYan University, Fujian, LongYan, 364012, China;1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China;2. Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;3. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;1. Institute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China;2. Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;1. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Key Laboratory for the Green Preparation and Application of Functional Materials, Ministry of Education, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, PR China;2. College of Science, Huazhong Agricultural University, Wuhan 430070, PR China;1. School of Physics and Electronics, Hunan University, Changsha, 410082, PR China;2. Fujian Strait Research Institute of Industrial Graphene Technologies, Quanzhou, 362000, PR China |
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| Abstract: | Paper cup composed of crude cellulose is a common waste in daily life. In this paper, hierarchical porous carbons have been successfully prepared by an initial hydrothermal treatment and subsequent activation route from abandoned paper cup, and then paper cup derived carbons are used as scaffolds to fabricate serial carbon/Se composites. The optimal composite presents unique 3D porous structure, with amorphous selenium uniformly confined into the micropores of carbon. As the cathode materials of Li-Se battery, this composite reveals an initial reversible discharge capacity of 517.2 mAh g−1 at 0.2C, and a capacity value of 431.9 mAh g−1 can be retained after 60 cycles. Even at a high rate of 4C, a capacity value of 295.8 mAh g−1 can be obtained. By comparison, the improved electrochemical performance of the optimal composite should be attributed to reasonable porous structure and effective encapsulation of amorphous selenium. |
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| Keywords: | Paper cup Porous carbon Carbon/Se composite Li-Se battery Structure-function relationship |
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