石墨烯量子点:兼具高效和环保的新型超级电容器电极材料

doi:10.11896/cldb.19070169

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Abstract Since the first discovery of graphene quantum dots (GQDs) by scientists in 2008, the preparation methods and application research have been widely concerned. With the rapid development of science and technology, researcher's investigation on carbon materials has started from three-dimensional graphite, two-dimensional graphene, to one-dimensional carbon nanotubes, and now to quasi-zero-dimensional graphene quantum dots. It has gone through a relatively long process. Graphene quantum dots have special physical and chemical properties, such as quantum confinement effect, edge effect, biocompatibility, photoluminescence and electroluminescence. Their applications in energy conversion and storage, photocatalysis, fluorescence sensor, drug delivery, bioimaging and therapeutic diagnosis have attracted more and more attention.
Supercapacitor is a common energy storage device, which is known for its fast charge and discharge time, high power density and wide temperature range. Carbon-based electric double layer capacitors and Faraday tantalum capacitor materials based on transition metal oxides and conductive polymers are hot issues, and graphene quantum dots, as a newcomer to the carbon material family, have been applied to supercapacitor electrode materials. Medium, either as a monomer material or in combination with other nanomaterials, exhibits excellent performance.
The main preparation methods of graphene quantum dots are “top-down” and “bottom-up”. The “top-down” method is to cut large-sized graphene and other carbon materials into small-sized quantum dots, while the “bottom-up” method is to synthesize quantum dots using molecules as precursors under certain conditions. In order to exert synergy between graphene quantum dots and other carbon materials, transition metal oxides, conductive polymers, etc., graphene quantum dots and three-dimensional graphene, carbon nanotubes, activated carbon, and their composites are synthesized through one-step or two-step reactions. Nanocomposites of manganese oxide, cerium oxide, nickel cobalt oxide, polyaniline and the like have better electrochemical performance than monomer materials, and greatly improve the overall performance of the supercapacitor.
In this paper, the application progress of graphene quantum dots in supercapacitor electrode materials is summarized. The preparation methods of graphene quantum dots, graphene quantum dots and their nanocomposites are introduced as supercapacitor electrode materials respectively. A new type of supercapacitor with high energy density, excellent cycle stability and environmental friendliness is available for reference.

Key words： graphene quantum dots supercapacitor electrode materials nanocomposites

Published: 17 November 2020

CLC number:

TM53

Fund:This work was funded by the National Natural Science Foundation of China (51262027), the Science and Technology Project Gansu Province (17YF1GA017;17JR5RA082), the Research Project of Higher Education in Gansu Province (2017A-002).

About author:: Hebing Pei received his B.S. degree in applied chemistry from College of Science, Beijing University of Che-mical Technology in 2016. He is currently a graduate student in the College of Chemistry and Chemical Engineering of Northwest Normal University, under the gui-dance of Professor Mo Zunli. His research has focused on nano functional composite.
Zunli Mo, professor, doctoral tutor, undergraduate and master's degree graduated from the College of Chemistry and Chemical Engineering of Northwest Normal University. He studied at the School of Materials Science of Northwestern Polytechnical University and received the first Ph.D. Thesis Innovation Fund from Northwestern Polytechnical University. He has been a senior visiting scholar in the College of Chemistry, Peking University and the College of Chemistry and Chemical Enginee-ring, Lanzhou University. Deputy Director of the Chemistry Education Committee of the Chinese Chemical Society, Deputy Chairman and Secretary General of the Gansu Society for Popularization of Science and Technology, National Outstanding Teacher, National Science Popularization Work Advanced Worker, Mingde Teacher Award from the Ministry of Education, Famous Teaching Teacher in Gansu Province, Famous Teaching Teacher in Innovation and Entrepreneurship Education in Gansu Province, Excellent Technologist in Gansu Province, Host of the National Science Creation and Product Development Demonstration Team, Northwest Normal University “Student's Favorite Teacher”, Northwest Normal University Science Construction Committee Deputy Director, Deputy Director of the Academic Committee, Director of the State Key Laboratory of Northwest Normal University. Mainly engaged in the research of functional composite materials, including carbon-based conductive composite materials, organic/inorganic nanocomposite materials, research and design of biomedical functional materials, assembly of functional nanomaterials and macromolecular materials; presided over and researched national and provincial scientific research 25 items.
Zhuang Liu received his B.S. degree from Changsha University of Science and Technology in 2018. He is currently pursuing his master's degree in the School of Energy & Power Engineering, Changsha University of Science and Technology, under the supervision of Associate Professor Jianlin Chen. His research is currently focusing on flexible perovskite solar cells.
Jianlin Chen is an associate professor and postgraduate supervisor in the School of Energy and Power Enginee-ring, Changsha University of Science and Technology, and vice president of Renewable Energy Society of Hunan Province. In June 1999, he graduated from Guilin Institute of Technology with a bachelor's degree. In September 2009, he received his Ph.D. degree in materials science and engineering from Hunan University. From December 2017 to December 2018, he was appointed as a visiting scholar by the China Scholarship Council to Minnesota University. He has mainly been engaged in the field of solar energy conversion and utilization, and new energy materials research. He has been responsible for one project by China National Natural Science Foundation and published more than 40 papers, which including 25 SCI and 6 EI indexed, in peer-reviewed journals.

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Cite this article:

PEI Hebing,MO Zunli,GUO Ruibin, et al. Graphene Quantum Dots: a Novel Supercapacitor Electrode Material that Combines High Efficiency and Environmental Protection[J]. Materials Reports, 2020, 34(21): 21093-21098.

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http://www.mater-rep.com/EN/10.11896/cldb.19070169 OR http://www.mater-rep.com/EN/Y2020/V34/I21/21093

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