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dc.contributor.author Makgopa, K
dc.contributor.author Ejikeme, PM
dc.contributor.author Jafta, CJ
dc.contributor.author Raju, K
dc.contributor.author Zeiger, M
dc.contributor.author Presser, V
dc.contributor.author Ozoemena, KI
dc.date.accessioned 2016-04-14T13:18:31Z
dc.date.available 2016-04-14T13:18:31Z
dc.date.issued 2015-01
dc.identifier.citation Makgopa, K, Ejikeme, P.M, Jafta, C.J, Raju, K, Zeiger, M, Presser, V and Ozoemena, K.I. 2015. A high-rate aqueous symmetric pseudocapacitor based on highly graphitized onion-like carbon/birnessite-type manganese oxide nanohybrids. Journal of Materials Chemistry A, vol. 3, pp 3480-3490 en_US
dc.identifier.issn 2050-7488
dc.identifier.uri http://pubs.rsc.org/en/content/articlehtml/2015/TA/C4TA06715K
dc.identifier.uri http://hdl.handle.net/10204/8477
dc.description Copyright: 2015 Royal Society of Chemistry en_US
dc.description.abstract We present a study on the pseudocapacitive properties of birnessite-type MnO(sub2) grafted on highly graphitized onion-like carbon (OLC/MnO(sub2)). In a three-electrode setup, we evaluated two different substrates, namely a platinum disc and nickel foam. The OLC/MnO2 nanohybrid exhibited a large specific capacitance (C(subsp)) of 295 and 323 F g(sup-1) (at 1 A g(sup-1)) for the Pt disc and Ni foam, respectively. In addition, the Ni foam substrate exhibited much higher rate capability (power density) than the Pt disc. A symmetrical two-electrode device, fabricated with the Ni foam, showed a large C(subsp) of 254 F g(sup-1), a specific energy density of 5.6 W h kg(sup-1), and a high power density of 74.8 kW kg(sup-1). These values have been the highest for onion-based electrodes so far. The device showed excellent capacity retention when subjected to voltage-holding (floating) experiments for 50 h. In addition, the device showed a very short time constant (t=40 ms). This high rate handling ability of the OLC/MnO(sub2) nanohybrid, compared to literature reports, promises new opportunities for the development of aqueous-based pseudocapacitors. en_US
dc.language.iso en en_US
dc.publisher Royal Society of Chemistry en_US
dc.relation.ispartofseries Workflow;16184
dc.subject Symmetric pseudocapacitor en_US
dc.subject Onion-like carbon en_US
dc.subject Nanohybrids en_US
dc.subject OLC/MnO2 en_US
dc.subject Manganese oxide en_US
dc.title A high-rate aqueous symmetric pseudocapacitor based on highly graphitized onion-like carbon/birnessite-type manganese oxide nanohybrids en_US
dc.type Article en_US


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