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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Elemental Modulation Inducing Defect Engineering to Enhance Electrochemical Capacitance and Rectification Performance
Bi Chen1, Wei-Bin Zhang1, Jie Feng1
1College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China.
Inorganic Chemistry
|May 2, 2025
Summary
High-entropy oxides with engineered defects improve electrochemical capacitor diodes. This advancement enhances energy storage and rectification, paving the way for advanced electronic devices.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Electrochemical capacitor diodes integrate energy storage and ion rectification but face limitations in performance.
- Existing materials struggle with insufficient rectification ratios and specific capacitance for widespread adoption.
Purpose of the Study:
- To develop advanced electrode materials for electrochemical capacitor diodes.
- To enhance rectification ratio and specific capacitance using high-entropy oxides.
- To investigate the impact of defect engineering on material properties.
Main Methods:
- Synthesis of high-entropy oxides, specifically (CrMnFeCoNiLi)3O4.
- Defect engineering and lattice optimization to enhance electrical conductivity.
- Characterization of electrochemical performance, including specific capacitance and rectification ratio.
- Cyclic stability and constant voltage tests.
Main Results:
- The (CrMnFeCoNiLi)3O4 electrode exhibited a high specific capacitance of 272.04 F g-1 and energy density of 182.87 Wh kg-1.
- Achieved favorable rectification performance with RRI of 6.5 and RRII of 0.95.
- Demonstrated excellent stability with retained rectification performance after 1000 cycles.
- Confirmed suitability for electronic circuits through constant voltage tests.
Conclusions:
- Defect-engineered high-entropy oxides show significant potential for high-performance energy storage and conversion devices.
- Optimized oxygen vacancies in high-entropy oxides enhance active sites and reaction kinetics.
- This approach offers a promising pathway for advancing electrochemical capacitor diodes.
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