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Updated: Mar 6, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Ternary Ni-Co-F Nanocrystal-Based Supercapacitors
Xudong Li1, Rui Ding1, Wei Shi1
1Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Hunan, 411105, P. R. China.
Ternary nickel cobalt fluoride (Ni-Co-F) nanocrystals offer enhanced supercapacitor performance. The optimal Ni-Co-F (Ni/Co=2:1) material demonstrates superior specific capacitance, rate capability, and energy density for advanced energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Supercapacitors are crucial for energy storage.
- Developing advanced positive electrode materials is key to improving supercapacitor performance.
- Ternary metal fluorides offer potential for high-performance supercapacitors.
Purpose of the Study:
- To synthesize and characterize ternary nickel cobalt fluoride (Ni-Co-F) nanocrystals.
- To evaluate Ni-Co-F as a positive electrode material for supercapacitors.
- To optimize the Ni/Co ratio for superior electrochemical performance.
Main Methods:
- Solvothermal synthesis of Ni-Co-F nanocrystals.
- Characterization using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS).
- Morphological and structural analysis via transmission electron microscopy (TEM) and nitrogen sorption.
- Electrochemical performance testing in supercapacitor devices.
Main Results:
- The optimal Ni-Co-F (Ni/Co=2:1) exhibited unique nanocrystal morphology and mesoporous structure.
- This composition showed enhanced specific capacitance (564 F/g at 1 A/g), rate capability (418 F/g at 16 A/g), and charge-transfer kinetics (449 Ω).
- An asymmetric supercapacitor using Ni-Co-F delivered high energy (18.4 Wh/kg) and power densities (6.64 kW/kg) with excellent cycle life (77% retention after 10,000 cycles).
Conclusions:
- Ternary Ni-Co-F nanocrystals are effective positive electrode materials for supercapacitors.
- The synergistic effect between Ni and Co redox species enhances electrochemical performance.
- The optimized Ni-Co-F (Ni/Co=2:1) offers a promising solution for high-performance energy storage devices.
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