Pseudocapacitance multiporous vanadyl phosphate/graphene thin film electrode for high performance electrochemical
Bingbing Hu1, Chuanlan Xu2, Danmei Yu2
1College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China; College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
Journal of Colloid and Interface Science
|February 7, 2021
Summary
Researchers developed a novel multiporous vanadyl phosphate/graphene (MP-VOPO4@rGO) thin film electrode for supercapacitors. This material demonstrates excellent energy storage capacity and long-term stability, paving the way for advanced energy storage systems.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Supercapacitors are crucial for sustainable energy storage.
- Optimizing pseudocapacitive materials like vanadyl phosphate is key to enhancing performance.
- Graphene incorporation can improve electrode conductivity and surface area.
Purpose of the Study:
- To fabricate and characterize a novel multiporous vanadyl phosphate/graphene (MP-VOPO4@rGO) nanocomposite.
- To evaluate its performance as a thin film electrode for supercapacitors.
- To analyze the impact of graphene and porous structure on electrochemical properties.
Main Methods:
- Sol-gel and drop coating methods were used for material synthesis.
- Polystyrene (PS) template was employed to create a honeycomb-like architecture.
- Electrochemical performance was tested using cyclic voltammetry and galvanostatic charge-discharge.
Main Results:
- The MP-VOPO4@rGO electrode achieved a high capacitance of 672 F g-1 at 1 A g-1.
- Excellent rate capability was observed with 552 F g-1 at 5 A g-1.
- Remarkable cycling stability was demonstrated, retaining 83.5% capacitance after 5000 cycles.
Conclusions:
- The developed MP-VOPO4@rGO nanocomposite exhibits superior pseudocapacitive performance.
- The honeycomb-like structure and graphene enhance active sites and reduce internal resistance.
- This work offers a versatile strategy for designing advanced polyanion phosphate composites for energy storage.
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