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NiO@CoSe2 nanostructures for high-performance asymmetric supercapacitors and efficient electrocatalysts
Xingyu Liu1, Mengdi Wang1, Ahmad Umar2
1School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, P. R. China. wuxiang05@sut.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|July 13, 2023
Summary
Core-shell NiO@CoSe2 materials enhance supercapacitor performance and hydrogen evolution reactions. This bi-functional material offers improved cycling stability for sustainable energy applications.
Area of Science:
- Materials Science
- Electrochemistry
- Sustainable Energy
Background:
- Nickel oxide (NiO) is a promising material for supercapacitors and electrocatalysts.
- Poor cycling stability of NiO hinders its practical application in energy storage and conversion.
- Development of bi-functional materials is crucial for sustainable energy solutions.
Purpose of the Study:
- To design and synthesize core-shell structured NiO@CoSe2 for enhanced energy storage and electrocatalytic activity.
- To investigate the electrochemical performance of NiO@CoSe2 in supercapacitors.
- To evaluate the electrocatalytic activity of NiO@CoSe2 for hydrogen evolution reactions.
Main Methods:
- Multi-step hydrothermal synthesis of core-shell NiO@CoSe2.
- Fabrication and testing of supercapacitor devices using NiO@CoSe2 as cathode.
- Electrochemical characterization for hydrogen evolution reaction (HER) performance.
Main Results:
- NiO@CoSe2 exhibited a specific capacitance of 1130 C g-1 at 1 A g-1.
- The asymmetric device delivered an energy density of 103.8 Wh kg-1 at 2700 W kg-1.
- NiO@CoSe2 showed an overpotential of 82.8 mV at 10 mA cm-2 and a Tafel slope of 72.14 mV dec-1 for HER.
Conclusions:
- Core-shell NiO@CoSe2 composite materials demonstrate excellent performance for both supercapacitors and hydrogen evolution reactions.
- The improved cycling stability and bi-functional properties make NiO@CoSe2 a promising candidate for advanced energy storage and conversion systems.
- This study highlights the potential of rationally designed core-shell structures for next-generation sustainable energy technologies.
