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Nanostructured MoS2/BiVO4 Composites for Energy Storage Applications
Yukti Arora1, Amit P Shah2, Shateesh Battu3
1Department of Chemical Sciences, Tata Institute of Fundamental Research, Mumbai-400005, India.
Scientific Reports
|November 4, 2016
Summary
A new molybdenum disulfide (MoS2)/bismuth vanadate (BiVO4) nanocomposite enhances supercapacitor performance. This material offers improved charge storage, longer discharge times, and better cycling stability for energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Supercapacitors are crucial for energy storage.
- Developing advanced electrode materials is key to improving supercapacitor performance.
- Metal oxides and layered transition metal dichalcogenides show promise for supercapacitor applications.
Purpose of the Study:
- To synthesize and electrochemically characterize a novel composite of few-layered molybdenum disulfide (MoS2) and bismuth vanadate (BiVO4).
- To evaluate the potential of this MoS2/BiVO4 nanocomposite as an electrode material for supercapacitor energy storage.
- To compare the performance of the MoS2/BiVO4 nanocomposite with pristine BiVO4 and graphene/BiVO4 composites.
Main Methods:
- Optimized synthesis of monoclinic BiVO4 and few-layered nanostructured MoS2.
- Fabrication of the MoS2/BiVO4 nanocomposite.
- Electrochemical characterization including specific capacitance and cycling stability tests using an aqueous electrolyte.
Main Results:
- The MoS2/BiVO4 nanocomposite demonstrated significantly improved charge storage compared to pristine BiVO4 and graphene/BiVO4.
- Specific capacitance values of 610 Fg-1 (170 mAhg-1) at 1 Ag-1 and 166 Fg-1 (46 mAhg-1) at 10 Ag-1 were achieved with only 2.5 wt% MoS2 loading.
- The composite exhibited enhanced discharge times and superior cycling stability.
Conclusions:
- The small lateral-dimension MoS2 particles contribute a significant capacitive component, augmenting the overall specific capacitance.
- The MoS2/BiVO4 nanocomposite shows great promise for advanced supercapacitor energy storage.
- This study highlights the synergistic effects of combining MoS2 and BiVO4 for high-performance energy storage devices.
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