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dc.contributor.authorQi, Hualei
dc.contributor.authorBo, Zheng
dc.contributor.authorYang, Shiling
dc.contributor.authorDuan, Liangping
dc.contributor.authorYang, Huachao
dc.contributor.authorYan, Jianhua
dc.contributor.authorCen, Kefa
dc.contributor.authorOstrikov, Kostya Ken
dc.date.accessioned2019-09-12T04:02:16Z
dc.date.available2019-09-12T04:02:16Z
dc.date.issued2019
dc.identifier.issn2405-8297
dc.identifier.doi10.1016/j.ensm.2018.07.019
dc.identifier.urihttp://hdl.handle.net/10072/387258
dc.description.abstractHigh-capacity energy storage in electrochemical capacitors may benefit from the combination of electric double-layer capacitance (EDLC) and pseudocapacitance to lead to high specific energy and power beyond the current capacity of rechargeable batteries. However, commonly pursued combinations of non-conductive pseudocapacitive and conductive EDLC materials rarely achieve synergistic effects. This work addresses the issue by demonstrating unique hierarchical microstructured electrodes comprising uniformly dispersed MnO2 nanoparticles on intentionally converted “pseudocapacitive” edges of plasma-grown Vertically Oriented Graphenes (VGs), with side-walls fully open to EDLC effects, and bonded at the base to the supporting highly conducting carbon nanofibers (CNFs), without any binder. The hierarchical structure combines the benefits of good conductivity of VGs and CNFs, the unique edge nucleation behavior and small size of MnO2 nanoparticles, and the large surface areas of the exposed graphene walls. Moderate oxidation of VGs helps refine MnO2 nanostructures and improve the cycle stability. The hybrid electrode delivers a specific capacitance of 612 F g-1 (32.7 F cm-3) at scan rate of 2 mV s-1 and exhibits good stability 109% after 5000 CV cycles at the scan rate of 100 mV s-1 in three-electrode system. The asymmetric electrode configuration based on it reveals a specific energy of 30.4 Wh kg-1 (0.90 mWh cm-3) and a specific power of 27.8 kW kg-1 (824 mW cm-3) at 15 A g-1. This work suggests new ways to produce hybrid MnO2-carbon hierarchical composite materials for the improved electrochemical capacitor performance.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.relation.ispartofpagefrom607
dc.relation.ispartofpageto618
dc.relation.ispartofjournalEnergy Storage Materials
dc.relation.ispartofvolume16
dc.subject.fieldofresearchChemical Engineering
dc.subject.fieldofresearchElectrical and Electronic Engineering
dc.subject.fieldofresearchcode0904
dc.subject.fieldofresearchcode0906
dc.subject.keywordsScience & Technology
dc.subject.keywordsPhysical Sciences
dc.subject.keywordsTechnology
dc.subject.keywordsChemistry, Physical
dc.subject.keywordsNanoscience & Nanotechnology
dc.titleHierarchical nanocarbon-MnO2 electrodes for enhanced electrochemical capacitor performance
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationQi, H; Bo, Z; Yang, S; Duan, L; Yang, H; Yan, J; Cen, K; Ostrikov, KK, Hierarchical nanocarbon-MnO2 electrodes for enhanced electrochemical capacitor performance, Energy Storage Materials, 2019, 16, pp. 607-618
dc.date.updated2019-09-12T03:59:40Z
gro.hasfulltextNo Full Text
gro.griffith.authorOstrikov, Kostya (Ken)


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