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 12/5 (Tue) Prof. George Crabtree (Argonne National Laboratory) ADMINI 2017.12.02 170
Notice 2017 신소재공학과 가을학기 정기세미나 ADMINI 2017.09.08 1472
213 02/28 (화) 스티브 박 교수 (카이스트 신소재공학과) ADMINI 2017.02.24 676
212 02/20 (월) 특별세미나 안내, 황철성 교수 (서울대) ADMINI 2017.02.14 589
211 02/08 (수) 특별 세미나 안내, 강용호 박사, UC Santa Barbara ADMINI 2017.02.02 860
210 12/23(금) 특별세미나 안내, 김재진 박사님(Chemical Sciences and Engineering Division, Argonne National Laboratory) ADMINI 2016.12.16 707
209 12/13(화) 송재용 박사 (한국표준과학연구원) ADMINI 2016.12.12 761
208 12/6 (화) 엄광섭 교수 (GIST 신소재공학부) ADMINI 2016.12.02 655
207 11/16(수) 특별 세미나 안내, 강승균 박사 (Dept. of MSE, University of Illinois at Urbana-Champaign) ADMINI 2016.11.16 605
» 11/15 (화) 전상은 교수 (경북대학교 신소재공학과) ADMINI 2016.11.14 809
205 11/8(화) Dr. Nikolai Tsvetkov (EEWS, KAIST) ADMINI 2016.11.07 640
204 11/1 (화) 고승환 교수 (서울대학교 기계공학과) ADMINI 2016.11.01 743
203 10/19(수) 특별 세미나 안내 Prof. Wei-Chuan Shih (Departments of Electrical & Computer Engineering, University of Houston) ADMINI 2016.10.18 582
202 10/18(화) 가와사키 메구미 교수 (한양대학교 신소재공학부) ADMINI 2016.10.17 739
201 10/11(화) 특별 세미나 안내 (Prof. Leon Abelmann, KIST Europe) ADMINI 2016.10.07 614
200 10/4(화) 노준석 교수 (포항공과대학교 기계공학과/화학공학과) ADMINI 2016.10.04 666
199 10/4(화) KAIST Self-Assembly Symposium 2016 file ADMINI 2016.09.30 719
198 9/30(금) 특별세미나 안내 (Mark Ediger, University of Wisconsin-Madison / Department of Chemistry) ADMINI 2016.09.30 609
197 9/27(화) 신성태 교수 (고려대학교 세종캠퍼스 디스플레이•반도체물리학과) ADMINI 2016.09.23 777
196 9/20(화) 한상수 박사 (한국과학기술원 계산과학연구센터 선임연구원) ADMINI 2016.09.19 725
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 2016.08.29 731
194 8/23(화) 특별세미나 안내 (김지환 교수, MIT) ADMINI 2016.08.22 730