Hydrothermal synthesis and activation of graphene-incorporated nitrogen-rich carbon composite for high-performance supercapacitors |
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| Affiliation: | 1. Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, P.R. China;2. Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou University of Light Industry, Zhengzhou 450002, China;1. Hunan Key Laboratory of Micro-Nano Energy Materials and Devices, Department of Physics, Xiangtan University, Xiangtan 411105, Hunan Province, PR China;2. College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, PR China;1. College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, PR China;2. Key Laboratory of Polymeric Materials & Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province, and Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan 411105, Hunan Province, PR China;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;3. Engineering Laboratory for Functionalized Carbon Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China;1. Faculty of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, Liaoning 116029, China;2. Carbon Research Laboratory, Center for Nano Materials and Science, School of Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology, Dalian 116012, China;1. School of Chemistry and Chemical Engineering, Shihezi University/Key Laboratory for Green Processing of Chemical Engineering of XinJiang Bingtuan/Engineering Research Center of Materials–Oriented Chemical Engineering of Xinjiang Bingtuan, Shihezi 832003, China;2. School of Materials Science and Engineering, Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, 300350, China;3. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;4. Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 300072, PR China |
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| Abstract: | Graphene-incorporated nitrogen-rich carbon composite with nitrogen content of ca. 10 wt.% has been synthesized by an effective yet simple hydrothermal reaction of glucosamine in the presence of graphene oxide (GO). The nitrogen content of carbon composite is nearly twice as high as that of hydrothermal carbon without graphene. GO is favorable for the high nitrogen doping in the carbon composite by the reaction between the glucosamine-released ammonia and GO. The hydrothermal carbon composite is further activated by KOH, and graphene in the activated carbon composite demonstrates a positive effect of increasing specific surface area, pore volume and electrical conductivity, resulting in superior electrochemical performance. The activated carbon composite with higher specific surface area and micropore volume possesses higher specific capacitance with a value of 300 F g−1 at 0.1 A g−1 in 6 M KOH aqueous solution in the two electrode cell. Larger mesopore volume and higher conductivity of the activated carbon composite will provide fast ion and electron transfer, thus leading to higher rate capacity with a capacitance retention of 76% at 8 A g−1 in comparison to the activated hydrothermal carbon without graphene. |
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