| 학회 |
한국공업화학회 |
| 학술대회 |
2020년 가을 (10/28 ~ 10/30, 광주 김대중컨벤션센터(Kimdaejung Convention Center)) |
| 권호 |
24권 1호 |
| 발표분야 |
[전기화학] 에너지분야 전기화학 시스템 연구 및 분석 기술 동향 |
| 제목 |
Utilization of redox-active ions to achieve the high energy supercapacitors |
| 초록 |
Redox-enhanced electrochemical double-layer capacitors (EDLC) increase energy density by using redox-active electrolytes that are oxidized at the positive electrode and reduced at the negative electrode during charging. We characterize several redox ions to illustrate operational/self-discharge mechanisms and design the rules for high performance Redox-EDLC. 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 30–50 Wh kg-1 is possible with optimization. |
| 저자 |
전상은 |
| 소속 |
경북대 |
| 키워드 |
Redox-active ion; Electrochemical capacitors; Aqueous solution; Self-discharge
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| E-Mail |
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