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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Insight into pseudocapacitive and electrical double-layer capacitive behaviors in polyaniline-based supercapacitors
Jian Wang1, Zhenzhen Shang1, Yao Ma2
1Key Laboratory of MEMS of the Ministry of Education, School of Integrated Circuits, Southeast University, China.
Journal of Colloid and Interface Science
|June 16, 2026
Summary
Researchers developed a simple method to create polyaniline (PANI)-based supercapacitors by controlling carbon nanotube (CNT) paper hydrophilicity, achieving both pseudocapacitive and electrical double-layer capacitive behaviors for enhanced energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Supercapacitors are crucial for energy storage, demanding advanced electrode materials for improved performance.
- Polyaniline (PANI) and carbon nanotubes (CNTs) are promising materials for supercapacitor electrodes due to their unique electrical and electrochemical properties.
- Controlling the morphology and composition of PANI/CNT composites is key to optimizing supercapacitor behavior.
Purpose of the Study:
- To develop a facile method for preparing PANI-based supercapacitors with tunable capacitive behaviors.
- To investigate the effect of carbon nanotube (CNT) paper hydrophilicity on PANI electrodeposition and resulting supercapacitor performance.
- To correlate PANI composition and morphology with pseudocapacitive and electrical double-layer capacitive contributions.
Main Methods:
- Electrodeposition of polyaniline (PANI) onto hydrophobic and hydrophilic carbon nanotube (CNT) paper substrates.
- Characterization of PANI growth kinetics and film morphology on CNT papers with varying hydrophilicity.
- Analysis of PANI composition, specifically the ratio of amine nitrogen functional groups (-NH-/-N=).
- Electrochemical testing of the fabricated supercapacitors to evaluate specific capacitance, cycling stability, and capacitive mechanisms.
Main Results:
- Hydrophobic CNT paper facilitated the formation of a continuous and uniform PANI film with a higher -NH-/-N= ratio, leading to pseudocapacitive behavior.
- Hydrophilic CNT paper resulted in PANI growth along the CNT texture with a lower -NH-/-N= ratio and larger surface area, promoting electrical double-layer capacitive behavior.
- The supercapacitors demonstrated high specific capacitance (∼1025.9 mF cm⁻²) and excellent cycling life (∼92.0% after 5000 cycles).
Conclusions:
- Modulating CNT paper hydrophilicity offers a facile route to control PANI growth and composition for tailored supercapacitor performance.
- The study successfully achieved both pseudocapacitive and electrical double-layer capacitive behaviors by rational design of PANI composition.
- The developed PANI/CNT supercapacitors exhibit competitive electrochemical performance, comparable to complex architectures.
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