Tuning diffusion coefficient, ionic conductivity, and transference number in rGO/BaCoO₃ electrode material for...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• ABO3-type perovskite materials offer excellent cycle stability and capacitance for electrode applications.
• BaCoO3/rGO composites were synthesized to explore their potential in supercapacitor (SC) devices.

Purpose of the Study:

• To synthesize and characterize BaCoO3/rGO composites for supercapacitor electrode applications.
• To evaluate the electrochemical performance and stability of these composites.

Main Methods:

• Solvothermal synthesis of BaCoO3/rGO composites with varying rGO content.
• X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) for structural and morphological analysis.
• Electrochemical characterization including cyclic voltammetry and galvanostatic charge-discharge (GCD) in 2 M KOH.

Main Results:

• XRD confirmed hexagonal phase structure; FESEM showed desired porosity and morphology.
• Electrochemical tests revealed a transition from EDLC to hybrid capacitor behavior.
• The BCO-III composite demonstrated a specific capacity of 90.15 C g-1, energy density of 21.28 W h kg-1, and power density of 531.25 W kg-1.
• BCO-III exhibited 90% capacity retention after 5k GCD cycles and 94% coulombic efficiency.

Conclusions:

• BaCoO3/rGO composites are effective electrode materials for supercapacitors.
• The BCO-III composite shows significant potential due to its high performance and stability.
• The material's properties highlight its suitability for advanced energy storage applications.