Activated carbons effectively purified by post-heat treatment under vacuum conditions
- Authors
- Kim, Junam; T. Nguyen, Hoai Van; Bahk, Gyung Jin; Kwak, Kyungwon; Lee, Kyung-Koo
- Issue Date
- 10월-2021
- Publisher
- SPRINGER JAPAN KK
- Keywords
- Activated carbon; Electric double-layer capacitor; Oxygen-containing functional groups; Specific surface area; Vacuum heat treatment
- Citation
- CARBON LETTERS, v.31, no.5, pp.973 - 984
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- CARBON LETTERS
- Volume
- 31
- Number
- 5
- Start Page
- 973
- End Page
- 984
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/136105
- DOI
- 10.1007/s42823-020-00209-y
- ISSN
- 1976-4251
- Abstract
- The effect of heat treatment and vacuum conditions on the textural properties and electrochemical performance of commercially available activated carbons (ACs) was investigated. The AC after post-heat treatment was characterized by nitrogen adsorption-desorption, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy measurements. The ACs treated under vacuum conditions exhibit a higher specific surface area and micropore surface area than those treated under nitrogen atmospheric pressure without significantly affecting the graphite structure of the AC. Under 800 degrees C temperature and vacuum conditions (AC-V800), the AC with the highest Brunauer-Emmett-Teller surface area of 1951.9 m(2) g(-1) (16.4% improvement relative to that of the original AC (1677.2 m(2) g(-1))) was obtained. This is attributed to the removal of oxygen-containing functional groups and volatile matters in the carbon by thermal treatment under vacuum conditions. Consequently, the electric double-layer capacitor using ACs treated under vacuum conditions (1 kPa) at 800 degrees C (AC-V800) shows considerably improved electrochemical performance in terms of higher specific capacitance and better cycling stability at a high working voltage (3.1 V), compared to the nitrogen-treated and commercial ACs.
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