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Optimizing synergistic effects: creating oxygen vacancies in NiCoWO4via a solid-state grinding method for improved
Anandhavalli Jeevarathinam1, Arun Annamalai1, Ramya Ravichandran1
1Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, 603203, India. sundaravadivelchem@gmail.com.
Dalton Transactions (Cambridge, England : 2003)
|October 21, 2024
Summary
Researchers developed an oxygen vacancy-enriched NiCoWO4 electrode for supercapacitors. This material shows high capacitance and excellent cycling stability, addressing limitations of traditional metal oxides for energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- High-performance electrochemical energy storage materials are crucial for meeting escalating electrical energy demands.
- Transition metal tungstates offer enhanced conductivity over pure oxides but suffer from low conductivity, limited active sites, and poor cycling stability.
- Oxygen vacancies are investigated as a strategy to overcome these limitations in metal oxide electrodes.
Purpose of the Study:
- To synthesize an oxygen vacancy-enriched NiCoWO4 electrode material for supercapacitor applications.
- To investigate the impact of oxygen vacancies on the electrochemical performance of NiCoWO4.
- To evaluate the performance of the synthesized material in a practical supercapacitor device.
Main Methods:
- A simple solid-state, solvent-free grinding process using NaBH4 was employed to synthesize oxygen vacancy-enriched NiCoWO4 (Ov-NiCoWO4).
- Electrochemical properties were characterized using techniques such as cyclic voltammetry and galvanostatic charge-discharge.
- A real-life supercapacitor device was assembled using Ov-NiCoWO4//AC configuration.
Main Results:
- The Ov-NiCoWO4 electrode exhibited a high specific capacitance of 703.66 F g-1 at 1 A g-1.
- Exceptional cycling stability was observed, with 87% capacitance retention over 2000 cycles at 7 A g-1.
- The Ov-NiCoWO4//AC supercapacitor achieved a capacitance of 129.10 F g-1 at 1 A g-1, with an energy density of 37.699 Wh kg-1 and power density of 724.98 W kg-1, retaining 88.5% capacitance over 1000 cycles.
Conclusions:
- The synthesized oxygen vacancy-enriched NiCoWO4 electrode demonstrates superior electrochemical performance for supercapacitors.
- Oxygen vacancies enhance electron carrier density, conductivity, active surface area, and redox reactivity, leading to improved capacitance and stability.
- The Ov-NiCoWO4 material shows significant potential for practical applications in high-performance energy storage devices.
