Mesoporous solids have stimulated increasing attention in diverse applications during the past decade, including pervasive utilization as electrode materials in energy storage devices, specifically in supercapacitors.1 They have an important role in addressing the major problem facing supercapacitor electrodes in which only the surface of the electroactive materials can effectively contribute to the total capacitance. Transition metal oxides containing binary or ternary types of cations are of great interest in energy storage research due to their multiple oxidation states, resulting in high electrochemical performance. CuCo2O4 nanostructures have shown high Li-ion storage capacities as an anode material in Li-ion batteries, suggesting that they can offer high-charge storage capacity through redox reactions.2 However, little work has been carried out on the application of CuCo2O4 as supercapacitor electrodes.3Herein, we report the synthesis of mesoporous CuCo2O4 nanowires by nanocasting from a silica SBA-15 hard template. The prepared sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Brunauer-Emmett-Teller (BET) analysis. Based on the obtained results, a highly-ordered mesoporous structure with an average pore diameter of about 3.72 nm was achieved. The electrochemical behavior of the sample as a supercapacitor electrode material was investigated through different techniques including cyclic voltammetry (CV), galvanostatic charge/discharge, and electrochemical impedance spectroscopy (EIS) in 6 M KOH solution. Mesoporous CuCo2O4 nanowires showed a high specific capacitance of 1210 F g-1 at a current density of 2 A g-1. The rate capability of the sample was studied, showing that with a 10-fold increase in the current density from 2 to 20 A g-1, 36% of the initial capacitance was retained (437 F g-1). The cycling performance of the sample was investigated during 3000 cycles, demonstrating high stability of the material. References:    [1] Meher, S. K.; Rao, G. R. Ultralayered Co3O4 for High-Performance Supercapacitor Applications. The Journal of Physical Chemistry C 2011, 115, 15646-15654.[2] Sun, S.; Wen, Z.; Jin, J.; Cui, Y.; Lu, Y. Synthesis of ordered mesoporous CuCo2O4 with different textures as anode material for lithium ion battery. Microporous Mesoporous Mater. 2013, 169, 242-247. [3] Pendashteh, A.; Rahmanifar, M. S.; Kaner, R. B.; Mousavi, M. F. Facile synthesis of nanostructured CuCo2O4 as a novel electrode material for high-rate supercapacitors. Chem. Commun. 2014, 50, 1972-1975.

Mesoporous copper-doped cobalt oxide for high-performance supercapacitors

248th National Meeting (2014)

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