Nwanya, ACAwada, CObi, DRaju, KumarOzoemena, Kenneth IOsuji, RURuediger, AMaaza, MRosei, FEzema, FI2019-03-202019-03-202017-02Nwanya, A.C. et al. 2017. Nanoporous copper-cobalt mixed oxide nanorod bundles as high performance pseudocapacitive electrodes. Journal of Electroanalytical Chemistry, vol. 787: 24-351572-6657doi.org/10.1016/j.jelechem.2017.01.031https://www.sciencedirect.com/science/article/pii/S1572665717300395http://hdl.handle.net/10204/10806Copyright: 2017 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 item is published in Journal of Electroanalytical Chemistry, vol. 787: 24-35We used a simple, cost effective and scalable chemical method to deposit mixed oxides of copper and cobalt on indium tin oxide (ITO) and stainless steel (ss) substrates. The deposited mixed oxides of Cu-Co and Co-Cu exhibit uniform surface morphology with nanoporous structure as obtained from scanning electron microscopy (SEM). The electrochemical properties were characterized by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). The Cu-Co oxide film on ITO yielded very high specific and volumetric capacitances of 919 Fg− 1 and 616.1 Fcm− 3 respectively with high energy (28.78 Wh kg− 1) and power (51.8 W kg− 1) densities. The same oxide on ss yields 195 Fg− 1 and 236.8 Fcm− 3 respectively for the specific and volumetric capacitances. In addition, the Cu-Co oxide electrode shows superior rate capability and excellent long-term cyclability. While the ss offers less internal resistance, the stability of the films is higher on ITO substrates. The bundles of rod-like Cu-Co mixed oxide embedded with nanoporous structure exposed more active surfaces with minimal ion diffusion length thereby enhancing the redox behavior and the binary oxides are synergistically responsible for superior rate capability and excellent durability. Our results indicate that these nanoporous electrodes are promising for use in pseudocapacitive applications.enCopper-cobalt mixed oxidesSupercapacitorsSpecific capacitanceSuccessive ionic layer adsorption and reactionCyclic voltammetryArticleNwanya, A., Awada, C., Obi, D., Raju, K., Ozoemena, K. I., Osuji, R., ... Ezema, F. (2017). Nanoporous copper-cobalt mixed oxide nanorod bundles as high performance pseudocapacitive electrodes. http://hdl.handle.net/10204/10806Nwanya, AC, C Awada, D Obi, Kumar Raju, Kenneth I Ozoemena, RU Osuji, A Ruediger, M Maaza, F Rosei, and FI Ezema "Nanoporous copper-cobalt mixed oxide nanorod bundles as high performance pseudocapacitive electrodes." (2017) http://hdl.handle.net/10204/10806Nwanya A, Awada C, Obi D, Raju K, Ozoemena KI, Osuji R, et al. Nanoporous copper-cobalt mixed oxide nanorod bundles as high performance pseudocapacitive electrodes. 2017; http://hdl.handle.net/10204/10806.TY - Article AU - Nwanya, AC AU - Awada, C AU - Obi, D AU - Raju, Kumar AU - Ozoemena, Kenneth I AU - Osuji, RU AU - Ruediger, A AU - Maaza, M AU - Rosei, F AU - Ezema, FI AB - We used a simple, cost effective and scalable chemical method to deposit mixed oxides of copper and cobalt on indium tin oxide (ITO) and stainless steel (ss) substrates. The deposited mixed oxides of Cu-Co and Co-Cu exhibit uniform surface morphology with nanoporous structure as obtained from scanning electron microscopy (SEM). The electrochemical properties were characterized by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). The Cu-Co oxide film on ITO yielded very high specific and volumetric capacitances of 919 Fg− 1 and 616.1 Fcm− 3 respectively with high energy (28.78 Wh kg− 1) and power (51.8 W kg− 1) densities. The same oxide on ss yields 195 Fg− 1 and 236.8 Fcm− 3 respectively for the specific and volumetric capacitances. In addition, the Cu-Co oxide electrode shows superior rate capability and excellent long-term cyclability. While the ss offers less internal resistance, the stability of the films is higher on ITO substrates. The bundles of rod-like Cu-Co mixed oxide embedded with nanoporous structure exposed more active surfaces with minimal ion diffusion length thereby enhancing the redox behavior and the binary oxides are synergistically responsible for superior rate capability and excellent durability. Our results indicate that these nanoporous electrodes are promising for use in pseudocapacitive applications. DA - 2017-02 DB - ResearchSpace DP - CSIR KW - Copper-cobalt mixed oxides KW - Supercapacitors KW - Specific capacitance KW - Successive ionic layer adsorption and reaction KW - Cyclic voltammetry LK - https://researchspace.csir.co.za PY - 2017 SM - 1572-6657 SM - doi.org/10.1016/j.jelechem.2017.01.031 T1 - Nanoporous copper-cobalt mixed oxide nanorod bundles as high performance pseudocapacitive electrodes TI - Nanoporous copper-cobalt mixed oxide nanorod bundles as high performance pseudocapacitive electrodes UR - http://hdl.handle.net/10204/10806 ER -