신소재공학과

행사일 20161115 

■ 제  Understanding the electrochemical storage mechanism in supercapacitors

                      
■ 연  전상은 교수 (경북대학교 신소재공학과

 

■ 초청자 : 남윤성 교수


■ 일  : 11 15 () 16:00 

 

■ 장  : 응용공학동 (W1) 1층 영상강의실

  

 내용Electrochemical 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.

No. Subject Author Date Views
Notice 6/16 (Fri) 안복엽 박사 (Harvard University) ADMINI 2017.06.13 650
208 12/6 (화) 엄광섭 교수 (GIST 신소재공학부) ADMINI 2016.12.02 433
207 11/16(수) 특별 세미나 안내, 강승균 박사 (Dept. of MSE, University of Illinois at Urbana-Champaign) ADMINI 2016.11.16 383
» 11/15 (화) 전상은 교수 (경북대학교 신소재공학과) ADMINI 2016.11.14 491
205 11/8(화) Dr. Nikolai Tsvetkov (EEWS, KAIST) ADMINI 2016.11.07 442
204 11/1 (화) 고승환 교수 (서울대학교 기계공학과) ADMINI 2016.11.01 504
203 10/19(수) 특별 세미나 안내 Prof. Wei-Chuan Shih (Departments of Electrical & Computer Engineering, University of Houston) ADMINI 2016.10.18 369
202 10/18(화) 가와사키 메구미 교수 (한양대학교 신소재공학부) ADMINI 2016.10.17 478
201 10/11(화) 특별 세미나 안내 (Prof. Leon Abelmann, KIST Europe) ADMINI 2016.10.07 425
200 10/4(화) 노준석 교수 (포항공과대학교 기계공학과/화학공학과) ADMINI 2016.10.04 453
199 10/4(화) KAIST Self-Assembly Symposium 2016 file ADMINI 2016.09.30 470
198 9/30(금) 특별세미나 안내 (Mark Ediger, University of Wisconsin-Madison / Department of Chemistry) ADMINI 2016.09.30 386
197 9/27(화) 신성태 교수 (고려대학교 세종캠퍼스 디스플레이•반도체물리학과) ADMINI 2016.09.23 541
196 9/20(화) 한상수 박사 (한국과학기술원 계산과학연구센터 선임연구원) ADMINI 2016.09.19 495
195 9/6 (화) 박승용 교수 (The Nelson Mandela African Institution of Science and Technology, Head of the Department of Materials and Energy Science and Engineering) ADMINI 2016.08.29 537
194 8/23(화) 특별세미나 안내 (김지환 교수, MIT) ADMINI 2016.08.22 500
193 8/2(화) KAIST International MSE Workshop 2016 ADMINI 2016.07.25 553
192 6/15(수) 특별세미나 안내 (박찬호 교수, GIST) ADMINI 2016.06.10 538
191 6/14(화) 임혜인 교수 (숙명여자대학교 물리학과) ADMINI 2016.06.09 576
190 6/7(화) 권순구 박사 (서울대학교 나노입자연구단 및 기초과학연구원 영 사이언티스트 펠로우) ADMINI 2016.06.02 535
189 5/31(화) 황동목 교수 (성균관대 신소재공학부) ADMINI 2016.05.27 566