Effect of microwave-treatment time on the properties of activated carbons for electrochemical capacitors
Source abstract
Abstract
Activated carbons (ACs) made from petroleum coke by KOH activation were further treated by microwaves to investigate the effect of microwave-treatment time on the pore structure, the surface properties (functional groups) and the electrochemical properties of the as-made ACs for electrochemical capacitors (ECs). Results show that the specific capacitance and the equivalent series resistance of microwave-treated ACs become smaller with a decrease in the Brunauer-Emmett-Teller surface area and the total pore volume (vt) of the treated ACs. Compared with the AC sample heated at 1073 K for 1 h by a conventional heating method, the AC sample treated by microwaves at 700 W for only 7 min has a pore size distribution with a high (meso- and macropore volume)/vt ratio and a high carbonyl content, and exhibits a high energy density and powder density as an electrode of ECs. This has clearly shown that the microwave-treatment is a simple and efficient approach to obtain high-performance ACs for ECs.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Supercapacitor Materials and Fabrication · Electrocatalysts for Energy Conversion · Advancements in Battery Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (19)
Show source-provided references
1. Progress of electrochemical capacitor electrode materials: a review [J]10.1016/j.ijhydene.2009.04.005 ↗
2. Continuous carbide-derived carbon films with high volumetric capacitance [J]10.1039/C0EE00404A ↗
3. A novel method for production of activated carbon from waste tea by chemical activation with microwave energy [J]10.1016/j.fuel.2008.05.005 ↗
4. Preparation of activated carbons by microwave heating KOH activation [J]10.1016/j.apsusc.2007.06.034 ↗
5. Effect of microwave and conventional regeneration on the microporous and mesoporous network and on the adsorptive capacity of activated carbons [J]10.1016/j.micromeso.2005.06.013 ↗
6. Preparation of high surface area activated carbons from tobacco stems with K2CO3 activation using microwave radiation [J]10.1016/j.indcrop.2007.11.011 ↗
7. Influence of KOH/coke mass ratio on properties of activated carbons made by microwave-assisted activation for electric double-layer capacitors [J]10.1021/ef100228b ↗
8. Recent developments in the preparation and regeneration of activated carbons by microwaves [J]10.1016/j.cis.2008.12.005 ↗
9. Optimization of activated carbon preparation by orthogonal experimental design for electrochemical capacitors [J]10.1166/sam.2010.1122 ↗
10. Effects of thermal treatment of activated carbon on the electrochemical behaviour in supercapacitors [J]10.1016/j.electacta.2007.01.071 ↗
11. Performance of electrical double layer capacitors with porous carbons derived from rice husk [J]10.1016/S0254-0584(03)00105-6 ↗
12. Influence of surface oxides on the impedance behavior of carbon-based electrochemical capacitors [J]10.1016/S0022-0728(02)01299-8 ↗
13. Improved voltammetric peak separation and sensitivity of uric acid and ascorbic acid at nanoplatelets of graphitic oxide [J]10.1016/j.elecom.2010.02.008 ↗
14. Effect of pore structure on the electrochemical performance of coal-based activated carbons in non-aqueous electrolyte [J]10.1016/S1872-5805(09)60020-2 ↗
15. Preparation of capacitor's electrode from sunflower seed shell [J]10.1016/j.biortech.2010.08.110 ↗
16. Surface chemical functional group modification of porous carbon [J]10.2174/2211334710801010027 ↗
17. Relationship between the nanoporous texture of activated carbons and their capacitance properties in different electrolytes [J]10.1016/j.carbon.2006.05.022 ↗
18. Direct synthesis of porous carbon nanotubes and its performance as conducting material of supercapacitor electrode [J]10.1016/j.diamond.2008.02.033 ↗
19. Energy storage in electrochemical capacitors: designing functional materials to improve performance [J]10.1039/c0ee00004c ↗