Influence of Ions Dimension on the Electric Field Activation of Micro-Crystallite Carbon

Authors

Gang-wei SUN, State Key Laboratory of Chemical Engineering,East China University of Science and Technology, Shanghai 200237,China;
Wen-hua SONG, State Key Laboratory of Chemical Engineering,East China University of Science and Technology, Shanghai 200237,China;
Guo CHENG, State Key Laboratory of Chemical Engineering,East China University of Science and Technology, Shanghai 200237,China;
Wen-ming QIAO, State Key Laboratory of Chemical Engineering,East China University of Science and Technology, Shanghai 200237,China;
Li-cheng LING, State Key Laboratory of Chemical Engineering,East China University of Science and Technology, Shanghai 200237,China;

Abstract

Micro-crystallite carbon ( CC) was synthesized by KOH activation of carbonized petroleum coke precursors. The porous properties structure and crystallite structure were characterized by N2 adsorption-desorption, X-ray diffraction ( XRD) measurements. The capacitive behavior of CC was investigated in the electrolyte of Et4NBF4 /PC,Et4NBF4 /AN,Bu4NBF4 /PC and Bu4NBF4 /AN,respectively. Results showed that the lower potential of electric field activation ( EFA) was obtained in the solvent of AN than in PC,which was ascribed to the fact that smaller solvated ions dimension in AN facilitating the intercalation of the solvated ions into micro-crystallite interlayer. The extent of EFA was more remarkable in AN under the same operating voltage due to its lower EFA potential; and consequently,produced the higher specific capacitance. With regarding to the Bu4NBF4 and Et4NBF4,little effect of cations size on the EFA process was observed,compared with that of solvent. After charge-discharged,micro-crystallite interlayer of CC swelled,indicating that the ion intercalation occurred during the EFA. And the interlayer expansion increased to a greater extent when the dimension of intercalated-ion was larger.

Keywords

micro-crystallite carbon, electric field activation, organic electrolyte

DOI Link

https://doi.org/10.61558/2993-074X.3342

Publication Date

2010-05-28

Online Available Date

2010-05-28

Revised Date

2010-05-28

Received Date

2010-05-28

Recommended Citation

Gang-wei SUN, Wen-hua SONG, Guo CHENG, Wen-ming QIAO, Li-cheng LING. Influence of Ions Dimension on the Electric Field Activation of Micro-Crystallite Carbon[J]. Journal of Electrochemistry, 2010 , 16(2): Article 14.
DOI: 10.61558/2993-074X.3342
Available at: https://jelectrochem.xmu.edu.cn/journal/vol16/iss2/14