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Published on: November 5, 2015
NiO/nanoporous graphene composites with excellent supercapacitive performance produced by atomic layer deposition
Caiying Chen1, Chaoqiu Chen, Peipei Huang
1State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, People's Republic of China. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, People's Republic of China.
Atomic layer deposition (ALD) created nickel oxide/nanoporous graphene composites for supercapacitors. These materials show enhanced conductivity, stability, and high capacitance, overcoming limitations of pure nickel oxide.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Nickel oxide (NiO) is a cost-effective material with high theoretical capacitance for supercapacitors.
- Limitations of NiO include poor electronic conductivity and cycling stability, hindering practical use.
- Nanoporous graphene (NG) offers high surface area and conductivity, making it a suitable support material.
Purpose of the Study:
- To fabricate NiO/NG composites using atomic layer deposition (ALD) for improved supercapacitor performance.
- To investigate the effect of NiO nanoparticle size on the electrochemical properties of the composites.
- To overcome the inherent limitations of NiO in supercapacitor applications.
Main Methods:
- Fabrication of NiO/NG composites via atomic layer deposition (ALD).
- Characterization of composite morphology and properties.
- Electrochemical performance evaluation using supercapacitor testing (specific capacitance, cycling stability).
Main Results:
- ALD enabled uniform deposition of NiO nanoparticles on NG, creating composites with high surface area.
- The NiO/NG composites exhibited excellent specific capacitance (up to ~1005.8 F g⁻¹ for the composite, ~1897.1 F g⁻¹ for NiO).
- The composites demonstrated stable performance over 1500 cycles, with performance dependent on NiO nanoparticle size.
Conclusions:
- ALD is an effective method for fabricating high-performance NiO/NG composite electrodes for supercapacitors.
- The developed NiO/NG composites show significant improvements in conductivity, capacitance, and cycling stability compared to bare NiO.
- Controlling NiO nanoparticle size during ALD is crucial for optimizing supercapacitor performance.
