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Role of polymeric surfactant in the synthesis of cobalt molybdate nanospheres for hybrid capacitor applications

Barmi, M.J. and Minakshi, M. (2016) Role of polymeric surfactant in the synthesis of cobalt molybdate nanospheres for hybrid capacitor applications. RSC Advances, 6 (42). pp. 36152-36162.

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The role of Pluronic F127, a triblock copolymer, i.e. poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) PEO-PPO-PEO, adsorbed on cobalt molybdate (CoMoO4), and its influence on the physico-chemical properties have been investigated. As a surfactant, Pluronic F127 is able to alter the surface properties of CoMoO4 during synthesis. Through a facile synthesis at 300 °C, F127 adsorbs at the interface and self-assembles into a micellar aggregate, resulting in the formation of CoMoO4 nanospheres. A cluster of nano-particles with an average size of 250 nm is obtained when F127 is added to CoMoO4, while rod-shaped particles (1 μm) are obtained in the absence of F127. The surfactant-assisted CoMoO4 is associated with enhanced pore accessibility and electronic conductivity, having a dual role in potential applications. The objective of this study is to test the as-synthesized CoMoO4 with regard to application in energy storage by tuning the surface properties. The hybrid capacitor (F127 added to CoMoO4vs. activated carbon) showed an excellent electrochemical performance with a specific capacitance of 79 F g-1 and an energy density of 38 W h kg-1 in 2 M NaOH electrolyte, which was much higher than that for pure CoMoO4 (23 F g-1). The long-term cycling stability of the modified CoMoO4 was tested and it was found to retain almost 80% of its initial capacity after 2000 cycles. The results obtained suggest that F127-modified CoMoO4 would be a suitable candidate for fabricating a cost-effective energy storage device.

Publication Type: Journal Article
Murdoch Affiliation: School of Engineering and Information Technology
Publisher: Royal Society of Chemistry
Copyright: © The Royal Society of Chemistry 2016.
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