신소재공학과

Seminar

Date 20161115 

■ Topic : Understanding the electrochemical storage mechanism in supercapacitors
                   
■ Speaker : 11/14(Tue) Prof. Sangeun Chun (Dept. of MSE, Kyungpook National Univ.)

 

■ Invitation : Prof. Yoon Sung Nam


■ Date & Time : November 15 (Tue) 16:00


■ Venue : KAIST Applied Engineering B/D(W1), Multimedia Lecture Hall (1st Floor)


■ Abstract : Electrochemical double-layer capacitors exhibit high power and long cycle life but have low specific energy compared with batteries, limiting applications. Redox-enhanced capacitors increase specific energy by using redox-active electrolytes that are oxidized at the positive electrode and reduced at the negative electrode during charging. Here we report characteristics of several redox electrolytes to illustrate operational/self-discharge mechanisms and the design rules for high performance. We discover a methyl viologen (MV)/bromide electrolyte that delivers a high specific energy of ~14 Wh kg-1 based on the mass of electrodes and electrolyte, without the use of an ion-selective membrane separator. Substituting heptyl viologen for MV increases stability, with no degradation over 20,000 cycles. Self-discharge is low, due to adsorption of the redox couples in the charged state to the activated carbon, and comparable to cells with inert electrolyte. An electrochemical model reproduces experiments and predicts that 3050 Wh kg-1 is possible with optimization.

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217 5/23 (Tue) Prof. Don Hyeong Ha (Choongang university) ADMINI 2017.05.19 1104
216 5/16 (Tue) Prof. Eun Sun Cho (KAIST CBE) ADMINI 2017.05.10 1314
215 5/2 (Tue) Prof. Seung Woo Lee (SKKU) ADMINI 2017.04.28 1408
214 4/25 (Tue) Prof. Hyeong Sup Choi (Seoul National University of Science and Technology) ADMINI 2017.04.20 1235
213 4/11 (Tue) Prof. Kyeong Sook Choi (Eulji National University, Medical school) ADMINI 2017.04.07 1281
212 4/4 (Tue) Mrs. Eun Joo Jang (Samsung) ADMINI 2017.03.31 1443
211 3/28 (Tue) Prof. Lim Won Bin (Jeonnam National University) ADMINI 2017.03.24 1208
210 3/21 (Tue) Prof. Park Sang Duk (Seoul National University) ADMINI 2017.03.20 1158
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207 02/28 (Tue) Prof. Steve Park (KAIST) ADMINI 2017.02.24 1482
206 02/20 (Mon) Special Seminar Announcement, Prof. Hwang (Seoul National University) ADMINI 2017.02.14 1399
205 02/08 (Wed) Special Seminar Announcement, Dr. Yong Ho Kang, UC Santa Barbara ADMINI 2017.02.02 1760
204 [Special Seminar] 12/23(Wed), Dr. Jaejin Kim (Chemical Sciences and Engineering Division, Argonne National Laboratory) ADMINI 2016.12.16 1564
203 12/13(Tue) Dr. Jae Yong Song (KRISS) ADMINI 2016.12.12 1587
202 12/6 (Tue) Prof. KwangSup Eom (School of MSE, GIST) ADMINI 2016.12.02 1389
201 [Special Seminar] 11/16(Wed), Dr. Seung-Kyun Kang (Dept. of MSE, University of Illinois at Urbana-Champaign) ADMINI 2016.11.16 1427
» 11/14(Tue) Prof. Sangeun Chun (Dept. of MSE, Kyungpook National Univ.) ADMINI 2016.11.14 1456