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Carbon aerogel-based supercapacitors modified by hummers oxidation method
Yuelong Xu1, Bin Ren1, Shasha Wang2
1Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang 050081, China; Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang 050081, China.
Journal of Colloid and Interface Science
|May 19, 2018
Summary
Modified carbon aerogels prepared using Hummers oxidation show enhanced performance for supercapacitors. Optimized oxidation and heteroatom doping yield high surface area and capacitance, demonstrating potential for energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Three-dimensional (3D) carbon aerogels are promising electrode materials for supercapacitors.
- Surface modification and heteroatom doping can enhance the electrochemical performance of carbon materials.
Purpose of the Study:
- To develop a novel oxidation modification method for carbon aerogels using Hummers oxidation.
- To investigate the impact of sulfuric acid stoichiometry and heteroatom doping on material properties and supercapacitor performance.
Main Methods:
- Preparation of modified carbon aerogels (OM-CA) via Hummers oxidation of carbon aerogel powders.
- Systematic variation of sulfuric acid concentration and manganese doping levels.
- Characterization of surface area and electrochemical performance (specific capacitance, cycle life) of OM-CA as supercapacitor electrodes.
Main Results:
- Optimized OM-CA (40 wt% H2SO4, 0.9 mol% Mn) achieved a specific surface area of 450 m²/g.
- The optimized OM-CA exhibited a high specific capacitance of 151 F/g at 0.5 A/g.
- OM-CA composite supercapacitors demonstrated excellent cycling stability, retaining 98.0% capacitance over 500 cycles.
Conclusions:
- The Hummers oxidation method effectively modifies carbon aerogels, enhancing their electrochemical properties.
- Heteroatom doping and optimized texture properties contribute to the superior performance of OM-CA.
- The developed OM-CA materials show significant potential for advanced supercapacitor applications.
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