Surface engineering towards high-energy carbon cathode for advanced aqueous zinc-ion hybrid capacitors |
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| Institution: | 1. Faculty of Chemistry and Material Science, Guangdong University of Education, Engineering Technology Development Center of Advanced Materials & Energy Saving and Emission Reduction in Guangdong Colleges and Universities, Guangzhou 510303, China;2. MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, The Key Lab of Low-carbon Chem & Energy Conservation of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China;1. BGRIMM Technology Group, Beijing 100160, China;2. Department of Chemistry, City University of Hong Kong, Hong Kong 999077, China;1. Hunan Key Laboratory of Green Metallurgy and New Energy Materials, College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou 412007, China;2. College of packaging and Material Engineering, Hunan University of Technology, Zhuzhou 412007, China;1. Henan Key Laboratory of Nanocomposite and Application, Zhengzhou City Key Laboratory of Supercapacitor, Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou 450006, PR China;2. School of Chemistry and Materials Engineering, Engineering Research Center of Biomass Conversion and Pollution Prevention of Anhui Educational Institutions, Fuyang Normal University, Fuyang 236037, PR China |
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| Abstract: | Opportunities coexist with challenges for the development of carbon-based cathodes with a high energy density applied for zinc ion hybrid capacitors (ZIHCs). In the present study, a facile and effective surface engineering approach is demonstrated to greatly improve the energy storage ability of commercial carbon paper (CP) in ZIHC. Benefiting from the introduced oxygen functional groups, larger surface area and improved surface wettability upon air calcination, the assembled aqueous ZIHC with the functionalized carbon paper (FCP) exhibits a much higher areal capacity of 0.22 mAh/cm2 at 1 mA/cm2, outperforming the counterpart with blank CP by over 5000 times. More importantly, a superior energy density and power density of 130.8 µWh/cm2 and 7460.5 µW/cm2, are respectively delivered. Furthermore, more than 90% of the initial capacity is retained over 10000 cycles. This surface engineering strategy to improve the energy storage capability is potentially applicable to developing a wide range of high-energy carbon electrode materials. |
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