期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 46, 期 15, 页码 21884-21893出版社
WILEY-HINDAWI
DOI: 10.1002/er.8715
关键词
energy density; flexible supercapacitor; graphene oxide; synergistic effect; thermal treatment
资金
- National Research Foundation of Korea [2021R1A2C1012735, 2022R1A2C2010803]
- National Research Foundation of Korea [2022R1A2C2010803, 2021R1A2C1012735] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Graphene-based flexible supercapacitors offer high-power densities, quick charging/discharging rates, and excellent cycle lives. By controlling the oxygen content and surface morphology, the supercapacitive properties of graphene nanosheets can be improved.
Graphene-based flexible supercapacitors (FSCs) are promising energy-storage devices that can potentially power the next generation of wearable and portable electronics owing to their high-power densities, quick charging/discharging rates, and excellent cycle lives. The manufacture of FSC devices with extended potential windows can help increase their energy density. However, the poor reaction kinetics of graphene (which has electric double-layer capacitive properties) can lead to low energy densities. In this study, graphene nanosheets with different oxygen contents are fabricated on a flexible carbon cloth substrate through thermal treatments in an argon atmosphere. The effects of the degree of disorder, surface area, and oxygen moieties on the supercapacitive properties of the nanosheets are explored systematically. Graphene oxide electrodes reduced at 300 degrees C are used as the cathode and anode, and they exhibit large areal capacitances of 82.7 and 324.4 mF cm(-2), respectively, at 4 mA cm(-2). When the proposed device is used as a symmetric FSC cell, the electrode exhibits an excellent areal capacitance (70.3 mF cm(-2) at 1 mA cm(-2)) and long cycle life in the 0 to 1.4 V voltage window. Furthermore, the FSC cell has a maximum energy density of 19.1 mu W h cm(-2) at a power density of 0.69 mW cm(-2).
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