期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 15, 页码 12983-12991出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00323
关键词
graphene quantum dots; uniform size; top-down strategy; energy storage; supercapacitor
资金
- National Natural Science Foundation of China [21776147, 21606140, 51373086]
- International Science & Technology Cooperation Program of China [2014DFA60150]
- Department of Education of Shandong Province [J16LA14, J17KA013]
- Department of Science and Technology of Shandong Province [2016GGX104010]
Graphene quantum dots (GQDs) with uniform sizes of less than 5 nm are synthesized by a novel top-down strategy. Nitric acid as a strong oxidant can be used to cut graphene oxide via sonication and hydrothermal processes. Moreover, purified GQDs are obtained from removing oxygen containing functional groups in a heat treatment process. Both nanoscale size and edge effect of GQDs improve their abundant active sites and restrain the restack of graphene nanosheets. Meanwhile, their electrochemical performance demonstrates the properties of the GQDs for practical application in energy storage. The GQD electrode material shows an ideal electric double-layer capacitance behavior such as a high specific capacitance of 296.7 F g(-1), a satisfactory energy density of 41.2 W h kg(-1) at 1 A g(-1), a low internal resistance, a small relaxation time, and an excellent cycling stability. The results illustrate excellent electrochemical activity, high conductivity, and enhanced ion transport rate on the surface of electrolyte and electrode. The advantages of GQDs confirm their unique characteristics for potential applications in the field of electrode materials for supercapacitors.
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