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Mesoporous transition metal oxides quasi-nanospheres with enhanced electrochemical properties for supercapacitor applications

Wang, Lu, Duan, Guorong, Zhu, Junwu, Chen, Shen-Ming, Liu, Xiao-heng, Palanisamy, Selvakumar
Journal of colloid and interface science 2016 v.483 pp. 73-83
cobalt oxide, electrochemistry, electrodes, electrolytes, manganese dioxide, nanospheres, nickel oxide, particle size, porosity, porous media, silica, surface area
In this report, we obtain mesoporous transition metal oxides quasi-nanospheres (includes MnO2, NiO, and Co3O4) by utilizing mesoporous silica nanospheres as a template for high-performance supercapacitor electrodes. All samples have a large specific surface area of approximately 254–325m²g⁻¹ and a relatively narrow pore size distribution in the region of 7nm. Utilization of a nanosized template resulted in a product with a relative uniform morphology and a small particle diameter in the region of 50–100nm. As supercapacitor electrodes, MnO2, NiO, and Co3O4 exhibit an outstanding capacity as high as 838–1185Fg⁻¹ at 0.5Ag⁻¹ and a superior long-term stability with minimal loss of 3–7% after 6000 cycles at 1Ag⁻¹. Their excellent electrochemical performances are attributed to favorable morphologies with a large surface area and a uniform architecture with abundant pores. The associated enhancement of electrolyte ion circulation within the electrode facilitates a significant increase in availability of Faradic reaction electroactive sites.