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Temperature-dependent flexible hybrid capacitors based on Ni(OH)2@NiS electrode materials
Wei Jia1, Qi He1, Zhiqiang Guo1
1School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, P. R. China. guozhiqiang217@163.com.
Dalton Transactions (Cambridge, England : 2003)
|August 19, 2025
Summary
We developed novel nickel hydroxide-nickel sulfide (Ni(OH)2@NiS) composites to enhance supercapacitor performance. These materials show improved energy storage and stability, even at extreme temperatures.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- The performance of supercapacitors is significantly influenced by electrode material morphology.
- Two-dimensional nickel hydroxide (Ni(OH)2) nanomaterials suffer from low conductivity and limited active sites, hindering their use in supercapacitors.
Purpose of the Study:
- To synthesize Ni(OH)2@NiS composites to overcome the limitations of Ni(OH)2 nanomaterials.
- To enhance the specific surface area and ion-transport rate for improved supercapacitor performance.
Main Methods:
- A two-step hydrothermal synthesis route was employed to create Ni(OH)2@NiS composites.
- Characterization of the synthesized materials and fabrication of asymmetric supercapacitors (ASCs).
Main Results:
- The Ni(OH)2@NiS-2 composite exhibited a high specific capacitance of 1778 F g-1 at 1 A g-1.
- The ASC device achieved an energy density of 110.25 Wh kg-1 at 2700 W kg-1 with 88% capacity retention after 10,000 cycles.
- The device demonstrated stable performance at extreme temperatures (-10 °C and -20 °C).
Conclusions:
- The synthesized Ni(OH)2@NiS composites offer a promising electrode material for high-performance supercapacitors.
- The improved properties enable efficient energy storage and stable operation under demanding conditions.
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