Lekitima, JNOzoemena, KIJafta, CJKobayashi, NSong, YTong, DChen, SOyama, M2014-05-222014-05-222013Lekitima, J.N, Ozoemena, K.I, Jafta, C.J, Kobayashi, N, Song, Y, Tong, D, Chen, S and Oyama, M. 2013. High-performance aqueous asymmetric electrochemical capacitor based on graphene oxide/cobalt(II)-tetrapyrazinoporphyrazine hybrids. Journal of Materials Chemistry A, vol. 1, pp 2821-28262050-7488http://pubs.rsc.org/en/content/articlelanding/2013/ta/c2ta01325h#!divAbstracthttp://hdl.handle.net/10204/7425Copyright: 2013 Royal Society of Chemistry. This is an OA journal. The journal authorizes the publication of the information herewith contained. Published in Journal of Materials Chemistry A, vol. 1, pp 2821-2826A novel asymmetric electrochemical capacitor (AEC) with high energy and power densities has been developed using a graphene oxide/cobalt(II)tetrapyrazinoporphyrazine composite (GO/CoTPyzPz) as the positive electrode and graphene oxide/carbon black (GO/CB) as the negative electrode in a neutral aqueous Na2SO4 electrolyte. The excellent specific capacitance, energy and power densities ( 500 F g−1, 44 W h kg−1 and 31 kW kg−1) coupled with long cycle life, excellent short response time, and low equivalent series resistance clearly indicate that this new material has great potential for the development of low-cost and ‘green’ aqueous AECs that operate at high energy and power densities. Interestingly, the energy density of the GO/CoTPyzPz//GOCB based AEC falls within the range usually observed for nickel metal hydride (NiMH) batteries (30–100 W h kg−1), but more importantly, shows better power performance than NiMH batteries (0.25–1 kW kg−1) widely used in hybrid vehicles such as Toyota Prius and Honda Insight.enAsymmetric electrochemical capacitorAECMaterials chemistryArticleLekitima, J., Ozoemena, K., Jafta, C., Kobayashi, N., Song, Y., Tong, D., ... Oyama, M. (2013). High-performance aqueous asymmetric electrochemical capacitor based on graphene oxide/cobalt(II)-tetrapyrazinoporphyrazine hybrids. http://hdl.handle.net/10204/7425Lekitima, JN, KI Ozoemena, CJ Jafta, N Kobayashi, Y Song, D Tong, S Chen, and M Oyama "High-performance aqueous asymmetric electrochemical capacitor based on graphene oxide/cobalt(II)-tetrapyrazinoporphyrazine hybrids." (2013) http://hdl.handle.net/10204/7425Lekitima J, Ozoemena K, Jafta C, Kobayashi N, Song Y, Tong D, et al. High-performance aqueous asymmetric electrochemical capacitor based on graphene oxide/cobalt(II)-tetrapyrazinoporphyrazine hybrids. 2013; http://hdl.handle.net/10204/7425.TY - Article AU - Lekitima, JN AU - Ozoemena, KI AU - Jafta, CJ AU - Kobayashi, N AU - Song, Y AU - Tong, D AU - Chen, S AU - Oyama, M AB - A novel asymmetric electrochemical capacitor (AEC) with high energy and power densities has been developed using a graphene oxide/cobalt(II)tetrapyrazinoporphyrazine composite (GO/CoTPyzPz) as the positive electrode and graphene oxide/carbon black (GO/CB) as the negative electrode in a neutral aqueous Na2SO4 electrolyte. The excellent specific capacitance, energy and power densities ( 500 F g−1, 44 W h kg−1 and 31 kW kg−1) coupled with long cycle life, excellent short response time, and low equivalent series resistance clearly indicate that this new material has great potential for the development of low-cost and ‘green’ aqueous AECs that operate at high energy and power densities. Interestingly, the energy density of the GO/CoTPyzPz//GOCB based AEC falls within the range usually observed for nickel metal hydride (NiMH) batteries (30–100 W h kg−1), but more importantly, shows better power performance than NiMH batteries (0.25–1 kW kg−1) widely used in hybrid vehicles such as Toyota Prius and Honda Insight. DA - 2013 DB - ResearchSpace DP - CSIR KW - Asymmetric electrochemical capacitor KW - AEC KW - Materials chemistry LK - https://researchspace.csir.co.za PY - 2013 SM - 2050-7488 T1 - High-performance aqueous asymmetric electrochemical capacitor based on graphene oxide/cobalt(II)-tetrapyrazinoporphyrazine hybrids TI - High-performance aqueous asymmetric electrochemical capacitor based on graphene oxide/cobalt(II)-tetrapyrazinoporphyrazine hybrids UR - http://hdl.handle.net/10204/7425 ER -