Simple Joule‑heating pyrolysis in air boosts capacitive performance of commercial carbon fiber cloth
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서지정보
ㆍ발행기관 : 한국탄소학회
ㆍ수록지정보 : Carbon letters / 32권 / 7호
ㆍ저자명 : Xiaohao Sun, Shuai Hou, Lan Yuan, Fen Guo
ㆍ저자명 : Xiaohao Sun, Shuai Hou, Lan Yuan, Fen Guo
목차
Abstract1 Introduction
2 Experimental and computational section
2.1 Joule-heating pyrolysis
2.2 Electrical furnace pyrolysis
2.3 Physico-chemical characterizations
2.4 Electrochemical measurements
2.5 Computational simulations
3 Results and discussion
4 Conclusions
Acknowledgements
References
영어 초록
Commercial carbon fiber cloth (CFC) is treated by the Joule-heating pyrolysis method in air to boost its capacitive performance on the premise of energy- and time-saving considerations. A thermoelectric coupling model suitable for the Jouleheating pyrolysis is successfully established based on the comparisons between the simulated temperatures and actually measured ones. The temperature field on CFC surface induced by the Joule heat presents a concentric-ellipse shape that the temperature in the core is the maximal and gradually decays outward. Increasing the direct current (DC) voltage which is applied to the CFC from 1.0 to 6.0 V, the core temperature on the CFC surface can be raised from 31 to 519 °C. The specific surface area and hydrophilicity of the as-prepared porous CFC are greatly improved compared with the pristine one. Electrochemical test shows that the optimal Joule-heating pyrolysis parameters falls at 5.0 V and 12.5 min, and the areal specific capacitance of as-obtained CFC-5.0-12.5 is about 80 folds that of the pristine CFC. In addition to the much shorter preparation time, all the characteristics including areal specific capacitance, rate performance, and electrical conductivity of the Joule-heating pyrolyzed CFC are superior to those of the electrical furnace pyrolyzed counterpart. The aqueous symmetrical supercapacitor made of CFC-5.0-12.5 electrodes exhibits considerable power and energy densities with respect to the previously reported carbon electrode-based supercapacitors. For conductive precursors, the Joule-heating pyrolysis can be an ideal substitute for the traditional electric furnace pyrolysis.참고 자료
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