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Updated: Apr 11, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Extraordinary Supercapacitor Performance of a Multicomponent and Mixed-Valence Oxyhydroxide
Jianli Kang1,2, Akihiko Hirata2, Luyang Chen2
1School of Materials Science and Engineering and State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387 (China).
Researchers developed a novel oxyhydroxide electrode from a NiCuMn alloy. This electrode offers high capacitance and an exceptionally wide potential window, enabling high energy density for advanced supercapacitors.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Supercapacitors require electrodes with high energy density and power.
- Developing materials with wide electrochemical stability windows is crucial for energy storage devices.
Purpose of the Study:
- To synthesize a novel multicomponent mixed-valence oxyhydroxide electrode.
- To evaluate its electrochemical performance, including specific capacitance and working-potential window.
- To assess its potential for high-energy and high-power supercapacitor applications.
Main Methods:
- Electrochemical polarization of a de-alloyed nanoporous NiCuMn alloy.
- Synthesis of a multicomponent mixed-valence oxyhydroxide.
- Characterization of electrochemical properties such as specific capacitance and potential window.
Main Results:
- Achieved a high specific capacitance > 627 F/cm³ (1097±95 F/g) at 0.25 A/cm³.
- Demonstrated an exceptionally wide working-potential window of 1.8 V in an aqueous electrolyte.
- Realized a high energy density of 51 mWh/cm³.
Conclusions:
- The novel oxyhydroxide electrode exhibits superior performance for supercapacitors.
- The combination of high capacitance and wide potential window surpasses limitations of aqueous electrolytes.
- This material is promising for next-generation high-energy and high-power energy storage systems.
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