研究目的
To study the electrochemical performance of BiFeO3-graphene composite as electrodes material for supercapacitor for high power application.
研究成果
The BFO-graphene nanocomposite is a promising electrode material for supercapacitor application where large power is required. The enhanced capacitive properties can be mainly ascribed to the porous type structural of the electrode and the great electronic mobility of graphene.
研究不足
The energy density decreases with increasing the scan rate due to the ions inaccessibility at such higher scan rates. Further improvement in the energy and power density can be made by estimating a proper amount of graphene and BFO in the composite electrode.
1：Experimental Design and Method Selection:
The BFO-graphene electrode was fabricated by drop casting approach. Bismuth ferrite nanoparticles were synthesized by sol-gel combustion method.
2：Sample Selection and Data Sources:
Two electrodes of size 2 cm x 2 cm each were used to fabricate the supercapacitor. The mass ratio of graphene to BFO was adjusted to be 1:10 in the composite electrode.
3：List of Experimental Equipment and Materials:
Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used for characterization. Electrochemical measurements were performed using the Bio-Logic system (Model, SP-300).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The electrodes were annealed at a substrate temperature of 250 oC. A filter paper was used as a separator between the electrodes. An electrolyte of 1M Na2SO4 was filled between the electrodes.
5：Data Analysis Methods:
The capacitive properties were studied from cyclic voltammetry (CV) and galvanostatic charging/discharging (GCD) processes in two electrode configuration.
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