dc.contributor.authorGao, Hongcai
dc.contributor.authorXiao, Fei
dc.contributor.authorChing, Chi Bun
dc.contributor.authorDuan, Hongwei
dc.date.accessioned2013-06-12T07:06:39Z
dc.date.available2013-06-12T07:06:39Z
dc.date.copyright2012en_US
dc.date.issued2012
dc.identifier.citationGao, H., Xiao, F., Ching, C. B., & Duan, H. (2012). High-Performance Asymmetric Supercapacitor Based on Graphene Hydrogel and Nanostructured MnO2. ACS Applied Materials & Interfaces, 4(5), 2801-2810.en_US
dc.identifier.issn1944-8244en_US
dc.identifier.urihttp://hdl.handle.net/10220/10270
dc.description.abstractWe have successfully fabricated an asymmetric supercapacitor with high energy and power densities using graphene hydrogel (GH) with 3D interconnected pores as the negative electrode and vertically aligned MnO2 nanoplates on nickel foam (MnO2-NF) as the positive electrode in a neutral aqueous Na2SO4 electrolyte. Because of the desirable porous structure, high specific capacitance and rate capability of GH and MnO2-NF, complementary potential window of the two electrodes, and the elimination of polymer binders and conducting additives, the asymmetric supercapacitor can be cycled reversibly in a wide potential window of 0–2.0 V and exhibits an energy density of 23.2 Wh kg–1 with a power density of 1.0 kW kg–1. Energy density of the asymmetric supercapacitor is significantly improved in comparison with those of symmetric supercapacitors based on GH (5.5 Wh kg–1) and MnO2-NF (6.7 Wh kg–1). Even at a high power density of 10.0 kW kg–1, the asymmetric supercapacitor can deliver a high energy density of 14.9 Wh kg–1. The asymmetric supercapacitor also presents stable cycling performance with 83.4% capacitance retention after 5000 cycles.en_US
dc.language.isoenen_US
dc.relation.ispartofseriesACS applied materials & interfacesen_US
dc.rights© 2012 American Chemical Society.en_US
dc.titleHigh-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2en_US
dc.typeJournal Article
dc.contributor.schoolSchool of Chemical and Biomedical Engineeringen_US
dc.identifier.doihttp://dx.doi.org/10.1021/am300455d


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