Synthesis and improved electrochemical performances of nano β-NiMoO4–CoMoO4·xH2O composites for asymmetric supercapacitors

Senthilkumar, B., Meyrick, D., Lee, Y-S and Selvan, R.K. (2013) Synthesis and improved electrochemical performances of nano β-NiMoO4–CoMoO4·xH2O composites for asymmetric supercapacitors. RSC Advances, 3 (37). pp. 16542-16548.

Abstract

Nano-sized β-NiMoO4-CoMoO4·xH 2O composites were synthesized by a solution combustion synthesis (SCS) technique. The effect of weight ratio of transition metal on the electrochemical capacitive performance of the nanocomposites was investigated by cyclic voltammetry and galvanostatic charge-discharge methods. The NiMoO 4-CoMoO4·xH2O nanocomposite with weight ratio of 3:1 (Ni:Co) exhibits enhanced capacitive behaviour relative to other composites and delivered a maximum specific capacitance of 1472 Fg-1 at a current density of 5 mAcm-2. The enhancement in specific capacitance is due to the small particle size, uniform size distribution, high surface area and high weight fraction of Ni. The synergistic effect of nickel and cobalt improves the electrochemical behaviour relative to pure nickel and cobalt molybdates. A full cell was fabricated using the β-NiMoO 4-CoMoO4·xH2O nanocomposite (3:1) and activated carbon (AC) as a positive and negative electrode, respectively. The cell delivered high capacitance (80 Fg-1) and energy density (28 Wh kg-1) and good cycling stability up to 1000 cycles.

Item Type:	Journal Article
Murdoch Affiliation(s):	School of Engineering and Information Technology
Publisher:	Royal Society of Chemistry
Copyright:	© The Royal Society of Chemistry 2013.
URI:	http://researchrepository.murdoch.edu.au/id/eprint/17967

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