Njomo, NWaryo, TMasikini, MIkpo, COMailu, STovide, ORoss, NWilliams, AMatinise, NSunday, CEMayedwa, NBaker, PGLOzoemena, KIIwuoha, EI2015-08-192015-08-192014-05Njomo, N, Waryo, T, Masikini, M, Ikpo, C.O, Mailu, S, Tovide, O, Ross, N, Williams, A, Matinise, N, Sunday, C.E, Mayedwa, N, Baker, P.G.L, Ozoemena, K.I and Iwuoha, E.I. 2014. Graphenated tantalum(IV) oxide and poly(4-styrene sulphonic acid)-doped polyaniline nanocomposite as cathode material in an electrochemical capacitor. Electrochimica Acta, vol. 128, pp 226-2370013-4686http://ac.els-cdn.com/S0013468614000024/1-s2.0-S0013468614000024-main.pdf?_tid=76a3cf34-426d-11e5-b157-00000aab0f02&acdnat=1439547541_62f1e6f54ae0c336b4a8542f3aae46e9http://hdl.handle.net/10204/8036Copyright: 2015 Elsevier. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in Electrochimica Acta, vol. 128, pp 226-237Nanostructured poly(4-styrene sulphonic acid) and tantalum (IV) oxide-doped polyaniline nanocomposite were synthesised and their electro-conductive properties were determined. The oxide was synthesized using a modified sol-gel method and then dispersed in acidic media through sonication and entrapped in-situ into the polymeric matrix during the oxidative chemical polymerization of aniline doped with poly(4-styrene sulphonic acid). The oxides and novel polymeric nanocomposite were characterised with TEM, SEM, EDX, XRD, FTIR, UV-visible to ascertain elemental and phase composition, successful polymerization, doping, morphology and entrapment of the metal oxide nanoparticles. The electro-conductivity of the nanomaterial was interrogated using scanning electrochemical microscopy (SECM) and cyclic voltammetry (CV). The material was then anchored on activated graphitic carbon and used in the design of an asymmetric supercapacitor cell using 6M KOH aqueous electrolyte. Characteristically high specific capacitance values of 318.4 F/g with a corresponding energy and power densities of 1.57 kWh/kg and 0.435kW/kg, respectively, were demonstrated. The cell also showed high coulombic efficiency of 94.9% with a long cycle life and good cycle stability making the nanomaterial suitable for constructing supercapacitor cell electrodes.enTantalum(IV) oxidePolyanilinePoly(4-styrene sulphonic) acidNanocompositesArticleNjomo, N., Waryo, T., Masikini, M., Ikpo, C., Mailu, S., Tovide, O., ... Iwuoha, E. (2014). Graphenated tantalum(IV) oxide and poly(4-styrene sulphonic acid)-doped polyaniline nanocomposite as cathode material in an electrochemical capacitor. http://hdl.handle.net/10204/8036Njomo, N, T Waryo, M Masikini, CO Ikpo, S Mailu, O Tovide, N Ross, et al "Graphenated tantalum(IV) oxide and poly(4-styrene sulphonic acid)-doped polyaniline nanocomposite as cathode material in an electrochemical capacitor." (2014) http://hdl.handle.net/10204/8036Njomo N, Waryo T, Masikini M, Ikpo C, Mailu S, Tovide O, et al. Graphenated tantalum(IV) oxide and poly(4-styrene sulphonic acid)-doped polyaniline nanocomposite as cathode material in an electrochemical capacitor. 2014; http://hdl.handle.net/10204/8036.TY - Article AU - Njomo, N AU - Waryo, T AU - Masikini, M AU - Ikpo, CO AU - Mailu, S AU - Tovide, O AU - Ross, N AU - Williams, A AU - Matinise, N AU - Sunday, CE AU - Mayedwa, N AU - Baker, PGL AU - Ozoemena, KI AU - Iwuoha, EI AB - Nanostructured poly(4-styrene sulphonic acid) and tantalum (IV) oxide-doped polyaniline nanocomposite were synthesised and their electro-conductive properties were determined. The oxide was synthesized using a modified sol-gel method and then dispersed in acidic media through sonication and entrapped in-situ into the polymeric matrix during the oxidative chemical polymerization of aniline doped with poly(4-styrene sulphonic acid). The oxides and novel polymeric nanocomposite were characterised with TEM, SEM, EDX, XRD, FTIR, UV-visible to ascertain elemental and phase composition, successful polymerization, doping, morphology and entrapment of the metal oxide nanoparticles. The electro-conductivity of the nanomaterial was interrogated using scanning electrochemical microscopy (SECM) and cyclic voltammetry (CV). The material was then anchored on activated graphitic carbon and used in the design of an asymmetric supercapacitor cell using 6M KOH aqueous electrolyte. Characteristically high specific capacitance values of 318.4 F/g with a corresponding energy and power densities of 1.57 kWh/kg and 0.435kW/kg, respectively, were demonstrated. The cell also showed high coulombic efficiency of 94.9% with a long cycle life and good cycle stability making the nanomaterial suitable for constructing supercapacitor cell electrodes. DA - 2014-05 DB - ResearchSpace DP - CSIR KW - Tantalum(IV) oxide KW - Polyaniline KW - Poly(4-styrene sulphonic) acid KW - Nanocomposites LK - https://researchspace.csir.co.za PY - 2014 SM - 0013-4686 T1 - Graphenated tantalum(IV) oxide and poly(4-styrene sulphonic acid)-doped polyaniline nanocomposite as cathode material in an electrochemical capacitor TI - Graphenated tantalum(IV) oxide and poly(4-styrene sulphonic acid)-doped polyaniline nanocomposite as cathode material in an electrochemical capacitor UR - http://hdl.handle.net/10204/8036 ER -