Oxygen-doped porous silicon carbide spheres as electrode materials for supercapacitors
- Authors
- Kim, Myeongjin; Ju, Hyun; Kim, Jooheon
- Issue Date
- 28-Jan-2016
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.18, no.4, pp 3331 - 3338
- Pages
- 8
- Journal Title
- PHYSICAL CHEMISTRY CHEMICAL PHYSICS
- Volume
- 18
- Number
- 4
- Start Page
- 3331
- End Page
- 3338
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/7359
- DOI
- 10.1039/c5cp06438d
- ISSN
- 1463-9076
1463-9084
- Abstract
- Oxygen-containing functional groups were introduced onto the surface of the micro-and meso-porous silicon carbide sphere (MMPSiC) in order to investigate the relationship between the electric double layer properties and pseudo-capacitive properties; the degree of oxidation of MMPSiC was also optimized. Although the oxygenated surface functionalities can lead to a decrease in the surface area of MMPSiC, the oxygen functional groups attached to the external surface can participate in the redox reaction, resulting in the enhancement of the total super-capacitive performance. The MMPSiC electrode oxidized for 24 h exhibits a high charge storage capacity with a specific capacitance of 301.1 F g(-1) at a scan rate of 5 mV s(-1), with 86.8% rate performance from 5 to 500 mV s(-1) in 1 M KCl aqueous electrolyte. This outstanding capacitive performance of the MMPSiC electrode oxidized for 24 h can be attributed to the harmonious synergistic effect between the electric double layer capacitive contribution of MMPSiC and the pseudo-capacitive contribution of the oxygen-containing functional groups. These encouraging results demonstrate that the MMPSiC electrode oxidized for 24 h is a promising candidate for high performance electrode materials for supercapacitors.
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