Activated carbons effectively purified by post‑heat treatment under vacuum conditions
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서지정보
ㆍ발행기관 : 한국탄소학회
ㆍ수록지정보 : Carbon letters / 31권 / 5호
ㆍ저자명 : Junam Kim, Hoai Van T. Nguyen1, Gyung Jin Bahk, Kyungwon Kwak, Kyung‑Koo Lee
ㆍ저자명 : Junam Kim, Hoai Van T. Nguyen1, Gyung Jin Bahk, Kyungwon Kwak, Kyung‑Koo Lee
목차
Abstract1 Introduction
2 Experimental
2.1 Material preparation
2.2 Characterizations
2.3 Electrochemical measurements
3 Results and discussion
3.1 Physical characteristics
3.2 Electrochemical properties
4 Conclusion
Acknowledgements
References
영어 초록
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 °C temperature and vacuum conditions (AC-V800), the AC with the highest Brunauer– Emmett–Teller surface area of 1951.9 m2 g−1 (16.4% improvement relative to that of the original AC (1677.2 m2 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 °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.참고 자료
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