MoO3 thin layers on NiCo2 S4 substrate for efficient electrochemical charge storage

Nanotechnology
Malaya K SahooRanga Rao G

Abstract

Ternary oxides/sulfides have long been investigated as promising electrode materials for charge storage applications. However, it is important to rationally design nanostructured hybrid composites for superior charge storage performance as electrodes in devices. In this work, MoO3@NiCo2S4 hybrid composites materials are synthesized by the hydrothermal method followed by annealing at different temperatures. The charge storage properties of these materials are tested by cyclic voltammetry, galvanostatic charge-discharge curves and electrochemical impedance spectroscopy. It is found that the structure of the hybrid composite material not only assists electron and charge transportation but also precisely control the volume expansion during redox reactions, contributing to superior electrochemical behavior. Among all the electrodes, the electrode fabricated with MoO3@NiCo2S4 composite material annealed at 400 °C (MoO3@NiCo2S4-400) is the best for charge storage applications. At 400 °C, MoO3 spreads as a thin layer of surface polymeric molybdates on NiCo2S4 as seen in the XRD pattern. Significantly, it delivers the highest capacitance of 1622 F g-1 at 1 A g-1 in 2 M aqueous KOH electrolyte compared to other hybrid composite electrode...Continue Reading

References

Oct 29, 2008·Nature Materials·Patrice Simon, Yury Gogotsi
May 17, 2011·ACS Applied Materials & Interfaces·Sumanta Kumar MeherG Ranga Rao
Jul 11, 2014·Chemical Reviews·Vanchiappan AravindanSrinivasan Madhavi
Jun 3, 2015·Chemical Communications : Chem Comm·Narendra KurraH N Alshareef
Sep 12, 2018·Chemical Reviews·Yuanlong ShaoRichard B Kaner

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