Jafta, CJNkosi, FLe Roux, Lukas JMathe, Mahlanyane KKebede, Mesfin AMakgopa, KSong, YTong, DOyama, MManyala, NChen, SOzoemena, KI2014-02-282014-02-282013-11Jafta, C.J, Nkosi, F, Le Roux, L.K. Mathe, M.K, Kebede, M, Makgopa, K, Song, Y, Tong, D, Oyama, M, Manyala, N, Chen, S and Ozoemena KI. 2013. Manganese oxide/graphene oxide composites for high-energy aqueous asymmetric electrochemical capacitors. Electrochimica Acta, vol. 110, pp 228-2330013-4686http://ac.els-cdn.com/S0013468613012024/1-s2.0-S0013468613012024-main.pdf?_tid=0dd57430-97d8-11e3-82fe-00000aab0f02&acdnat=1392644175_05c404dec64824f5834e64bff2b0cf56http://hdl.handle.net/10204/7254https://www.sciencedirect.com/science/article/pii/S0013468613012024https://doi.org/10.1016/j.electacta.2013.06.096Copyright: 2013 Elsevier. This is an ABSTRACT ONLY. The definitive version is published in Electrochimica Acta, vol. 110, pp 228-233A high-energy aqueous asymmetric electrochemical capacitor was developed using manganese diox-ide ( -MnO2)/graphene oxide (GO) nanocomposites. The nanostructured -MnO2was prepared frommicron-sized commercial electrolytic manganese dioxide (EMD) via a hydrothermal reaction in the pres-ence and absence of sodium dodecylsulphate (SDS), -MnO2(SDS)and -MnO2, respectively. Unlike theas-prepared -MnO2, the presence of SDS during the hydrothermal reaction conferred different mor-phologies on the intermediate precursors for the -MnO2(SDS). Also, the XRD patterns showed that the -MnO2(SDS)are more crystalline than the as-prepared -MnO2. The superior electrochemical perfor-mance of the -MnO2(SDS)/GO composite (280 F g−1, 35 Wh kg−1, and 7.5 kW kg−1at 0.5 A g−1) coupledwith excellent long cycle life clearly indicates that this electrode system has the potential of beingdeveloped as an efficient aqueous asymmetric electrochemical capacitor. The high performance of the -MnO2(SDS)/GO composite was interpreted in terms of the enhanced crystallinity of the -MnO2(SDS).Interestingly, the electrochemical performance is comparable to or even better than those reported for the more conductive graphene/MnO2composites.enElectrolytic manganese dioxideMnO2Graphene oxideAsymmetric capacitorAqueous electrolyteEnergy densityArticleJafta, C., Nkosi, F., Le Roux, L. J., Mathe, M. K., Kebede, M. A., Makgopa, K., ... Ozoemena, K. (2013). Manganese oxide/graphene oxide composites for high-energyaqueous asymmetric electrochemical capacitors. http://hdl.handle.net/10204/7254Jafta, CJ, F Nkosi, Lukas J Le Roux, Mahlanyane K Mathe, Mesfin A Kebede, K Makgopa, Y Song, et al "Manganese oxide/graphene oxide composites for high-energyaqueous asymmetric electrochemical capacitors." (2013) http://hdl.handle.net/10204/7254Jafta C, Nkosi F, Le Roux LJ, Mathe MK, Kebede MA, Makgopa K, et al. Manganese oxide/graphene oxide composites for high-energyaqueous asymmetric electrochemical capacitors. 2013; http://hdl.handle.net/10204/7254.TY - Article AU - Jafta, CJ AU - Nkosi, F AU - Le Roux, Lukas J AU - Mathe, Mahlanyane K AU - Kebede, Mesfin A AU - Makgopa, K AU - Song, Y AU - Tong, D AU - Oyama, M AU - Manyala, N AU - Chen, S AU - Ozoemena, KI AB - A high-energy aqueous asymmetric electrochemical capacitor was developed using manganese diox-ide ( -MnO2)/graphene oxide (GO) nanocomposites. The nanostructured -MnO2was prepared frommicron-sized commercial electrolytic manganese dioxide (EMD) via a hydrothermal reaction in the pres-ence and absence of sodium dodecylsulphate (SDS), -MnO2(SDS)and -MnO2, respectively. Unlike theas-prepared -MnO2, the presence of SDS during the hydrothermal reaction conferred different mor-phologies on the intermediate precursors for the -MnO2(SDS). Also, the XRD patterns showed that the -MnO2(SDS)are more crystalline than the as-prepared -MnO2. The superior electrochemical perfor-mance of the -MnO2(SDS)/GO composite (280 F g−1, 35 Wh kg−1, and 7.5 kW kg−1at 0.5 A g−1) coupledwith excellent long cycle life clearly indicates that this electrode system has the potential of beingdeveloped as an efficient aqueous asymmetric electrochemical capacitor. The high performance of the -MnO2(SDS)/GO composite was interpreted in terms of the enhanced crystallinity of the -MnO2(SDS).Interestingly, the electrochemical performance is comparable to or even better than those reported for the more conductive graphene/MnO2composites. DA - 2013-11 DB - ResearchSpace DP - CSIR KW - Electrolytic manganese dioxide KW - MnO2 KW - Graphene oxide KW - Asymmetric capacitor KW - Aqueous electrolyte KW - Energy density LK - https://researchspace.csir.co.za PY - 2013 SM - 0013-4686 T1 - Manganese oxide/graphene oxide composites for high-energyaqueous asymmetric electrochemical capacitors TI - Manganese oxide/graphene oxide composites for high-energyaqueous asymmetric electrochemical capacitors UR - http://hdl.handle.net/10204/7254 ER -