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A novel approach to fabricate carbon sphere intercalated holey graphene electrode for high energy density electrochemical capacitors
Wu, Shuxing; Hui, Kwan San; Hui, Kwun Nam; Yun, Je Moon; Kim, Kwang Ho
2017-06
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume317Pages:461-470
AbstractDesirable porous structure and huge ion-accessible surface area are crucial for rapid electronic and ionic pathway electrodes in high-performance graphene-based electrochemical capacitors. However, graphene nanosheets tend to aggregate and restack because of van der Waals interaction among graphene sheets, resulting in the loss of ion-accessible surface area and unsatisfactory electrochemical performance. To resolve this daunting challenge, a novel approach is developed for the self-assembly of holey graphene sheets intercalated with carbon spheres (H-GCS) to obtain freestanding electrodes by using a simple vacuum filtration approach and a subsequent KOH activation process. Through the introduction of carbon spheres as spacers, the restacking of reduced graphene oxide (rGO) sheets during the filtration process is mitigated efficiently. Pores on rGO sheets produced by subsequent KOH activation also provide rapid ionic diffusion kinetics and high ion-accessible electrochemical surface area, both of which favor the formation of electric double-layer capacitance. Furthermore, a higher degree of graphitization of CSs in H-GCS thin film improves the electrical conductivity of the H-GCS electrode. The H-GCS electrode exhibits 207.1 F g(-1) of specific capacitance at a current density of 1 A g(-1) in 6 M KOH aqueous electrolyte. Moreover, the symmetric electrochemical capacitor assembled with H-GCS electrodes and organic electrolyte is capable of delivering a maximum energy density of 29.5 Wh kg(-1) and a power density of 22.6 kW kg(-1). (C) 2017 Elsevier B.V. All rights reserved.
KeywordElectrochemical capacitor High energy density Holey graphene Carbon sphere
DOI10.1016/j.cej.2017.02.040
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEngineering
WOS SubjectEngineering, Environmental ; Engineering, Chemical
WOS IDWOS:000400226700043
PublisherELSEVIER SCIENCE SA
The Source to ArticleWOS
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Cited Times [WOS]:23   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
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GB/T 7714
Wu, Shuxing,Hui, Kwan San,Hui, Kwun Nam,et al. A novel approach to fabricate carbon sphere intercalated holey graphene electrode for high energy density electrochemical capacitors[J]. CHEMICAL ENGINEERING JOURNAL,2017,317:461-470.
APA Wu, Shuxing,Hui, Kwan San,Hui, Kwun Nam,Yun, Je Moon,&Kim, Kwang Ho.(2017).A novel approach to fabricate carbon sphere intercalated holey graphene electrode for high energy density electrochemical capacitors.CHEMICAL ENGINEERING JOURNAL,317,461-470.
MLA Wu, Shuxing,et al."A novel approach to fabricate carbon sphere intercalated holey graphene electrode for high energy density electrochemical capacitors".CHEMICAL ENGINEERING JOURNAL 317(2017):461-470.
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