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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
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Low-dimensional high entropy oxide (FeCoCrMnNi)3O4 for supercapacitor applications
Yi Yin1, Wei-Bin Zhang1, Xian-Li Zhang1
1College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China. zhangweibin17@cdut.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|June 19, 2023
Summary
High entropy oxides show promise for supercapacitors. Researchers enhanced their energy density by optimizing calcination temperature, achieving a specific capacitance of 332.2 F g⁻¹ and energy density of 103.8 W h kg⁻¹.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- High entropy oxides (HEOs) are explored as electrode materials for supercapacitors.
- A key challenge is their limited energy density.
Purpose of the Study:
- To enhance the energy density and specific capacitance of HEOs.
- To investigate the effect of calcination temperature on HEO properties and performance.
Main Methods:
- Synthesized HEOs using a sol-gel method with transition metals (Fe, Co, Cr, Mn, Ni).
- Varied calcination temperatures to control structural morphology and crystallinity.
- Evaluated electrochemical performance in 1 M KOH electrolyte using cyclic voltammetry and galvanostatic charge-discharge.
Main Results:
- Spinel-phase (FeCoCrMnNi)₃O₄ with a high surface area (63.1 m² g⁻¹) was obtained at 450 °C.
- Achieved a specific capacitance of 332.2 F g⁻¹ at 0.3 A g⁻¹ within a wide potential window (-1, 0.6 V).
- Reached an improved energy density of 103.8 W h kg⁻¹.
Conclusions:
- Calcination temperature significantly influences HEO microstructure and electrochemical properties.
- Optimized HEOs demonstrate potential for high-performance supercapacitors.
- The designed microstructure contributes to enhanced energy storage capabilities.
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