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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
PH dependent morphological evolution of beta-Bi2O3/PANI composite for supercapacitor applications
T Ganesh1, Dukho Ham, Jinho Chang
1Department of Chemistry, Inorganic-Nanomaterials Laboratory, Hanyang University Sungdong-ku, Haengdang-dong 17, Seoul 133-791, Korea.
Journal of Nanoscience and Nanotechnology
|March 31, 2011
Summary
Researchers synthesized beta-Bi2O3 nanoparticles and platelets using a chemical bath process. The resulting beta-Bi2O3/polyaniline (PANI) composite showed significantly enhanced specific capacitance due to morphological changes.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Bismuth oxide (Bi2O3) is a promising material for energy storage applications.
- Controlling the morphology of Bi2O3 is crucial for optimizing its electrochemical performance.
- Polyaniline (PANI) is a conductive polymer often used in composite electrodes.
Purpose of the Study:
- To investigate the synthesis of crystalline beta-Bi2O3 with controlled morphology via pH-dependent chemical bath deposition.
- To explore the formation of beta-Bi2O3/polyaniline (PANI) composites and their electrochemical properties.
- To correlate the nanostructure evolution of beta-Bi2O3 with enhanced specific capacitance.
Main Methods:
- Chemical bath deposition with precise pH control (pH 9 and pH 12).
- In-situ nucleation and growth of aniline on beta-Bi2O3.
- Morphological characterization of synthesized materials.
- Electrochemical testing, including cyclic voltammetry and galvanostatic charge-discharge.
Main Results:
- Beta-Bi2O3 synthesized as nanoparticles at pH 9 and platelets at pH 12.
- Increased surface area and specific capacitance observed in beta-Bi2O3/PANI composites.
- Morphological transformation to platelet-like nanostructures enhanced specific capacitance from 210 to 430 F/g at 10 mV/s.
- Improved ionic diffusion and 84% capacitance retention at higher scan rates.
Conclusions:
- The pH-dependent synthesis offers a route to control beta-Bi2O3 morphology.
- The platelet-like nanostructure of beta-Bi2O3/PANI composites is beneficial for supercapacitor performance.
- The developed composite material demonstrates potential for high-performance energy storage devices.
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