dc.contributor.author |
Makgopa, K
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dc.contributor.author |
Ejikeme, PM
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dc.contributor.author |
Jafta, CJ
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dc.contributor.author |
Raju, Kumar
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dc.contributor.author |
Zeiger, M
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dc.contributor.author |
Presser, V
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dc.contributor.author |
Ozoemena, KI
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dc.date.accessioned |
2016-04-14T13:18:31Z |
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dc.date.available |
2016-04-14T13:18:31Z |
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dc.date.issued |
2015-01 |
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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 |
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dc.identifier.uri |
http://pubs.rsc.org/en/content/articlehtml/2015/TA/C4TA06715K
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dc.identifier.uri |
http://hdl.handle.net/10204/8477
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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 |
dc.identifier.apacitation |
Makgopa, K., Ejikeme, P., Jafta, C., Raju, K., Zeiger, M., Presser, V., & Ozoemena, K. (2015). A high-rate aqueous symmetric pseudocapacitor based on highly graphitized onion-like carbon/birnessite-type manganese oxide nanohybrids. http://hdl.handle.net/10204/8477 |
en_ZA |
dc.identifier.chicagocitation |
Makgopa, K, PM Ejikeme, CJ Jafta, Kumar Raju, M Zeiger, V Presser, and KI Ozoemena "A high-rate aqueous symmetric pseudocapacitor based on highly graphitized onion-like carbon/birnessite-type manganese oxide nanohybrids." (2015) http://hdl.handle.net/10204/8477 |
en_ZA |
dc.identifier.vancouvercitation |
Makgopa K, Ejikeme P, Jafta C, Raju K, Zeiger M, Presser V, et al. A high-rate aqueous symmetric pseudocapacitor based on highly graphitized onion-like carbon/birnessite-type manganese oxide nanohybrids. 2015; http://hdl.handle.net/10204/8477. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Makgopa, K
AU - Ejikeme, PM
AU - Jafta, CJ
AU - Raju, Kumar
AU - Zeiger, M
AU - Presser, V
AU - Ozoemena, KI
AB - 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.
DA - 2015-01
DB - ResearchSpace
DP - CSIR
KW - Symmetric pseudocapacitor
KW - Onion-like carbon
KW - Nanohybrids
KW - OLC/MnO2
KW - Manganese oxide
LK - https://researchspace.csir.co.za
PY - 2015
SM - 2050-7488
T1 - A high-rate aqueous symmetric pseudocapacitor based on highly graphitized onion-like carbon/birnessite-type manganese oxide nanohybrids
TI - A high-rate aqueous symmetric pseudocapacitor based on highly graphitized onion-like carbon/birnessite-type manganese oxide nanohybrids
UR - http://hdl.handle.net/10204/8477
ER -
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en_ZA |