Abstract
Supercapacitors can provide a high specific power and long cycle life but suffer a significant self-discharge limiting their application as a stand-alone energy storage device. A new hybrid supercapacitor with incorporated galvanic cell components was proposed to mitigate the self-discharge problem. The hybrid supercapacitor was similar to a conventional supercapacitor with two active carbon electrodes separated by a polymer electrolyte membrane containing 1.5 M zinc sulfate. However, a zinc foil and a copper foil were used as the current collectors for the negative and the positive electrodes respectively, which can provide a micro-current to compensate the self-discharge current. The hybrid supercapacitor exhibited a maximum specific capacitance of 55 F g− 1 and specific energy of 4.51 Wh kg−1 with a charge efficiency of 90%. The capacitance retention of the hybrid supercapacitor was 80% after 2000 cycles. The open circuit voltage of the charged hybrid supercapacitor was stable and declined slightly from initial 0.90 V–0.85 V in a month. The results demonstrate that via replacement of a pair of conventional metal current collectors with a galvanic couple the ubiquitous self-discharge problem can be significantly mitigated and the storage time can be prolonged to meet the requirement for stand-alone applications.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1035-1045 |
| Number of pages | 11 |
| Journal | Energy |
| Volume | 159 |
| DOIs | |
| State | Published - Sep 15 2018 |
Fingerprint
Keywords
- Galvanic cell
- Hybrid supercapacitor
- Self-discharge
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- Pollution
- Mechanical Engineering
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering
Cite this
Self-discharge of a hybrid supercapacitor with incorporated galvanic cell components. / Wang, Y.; Qiao, X.; Zhang, C.; Zhou, Xiangyang.
In: Energy, Vol. 159, 15.09.2018, p. 1035-1045.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Self-discharge of a hybrid supercapacitor with incorporated galvanic cell components
AU - Wang, Y.
AU - Qiao, X.
AU - Zhang, C.
AU - Zhou, Xiangyang
PY - 2018/9/15
Y1 - 2018/9/15
N2 - Supercapacitors can provide a high specific power and long cycle life but suffer a significant self-discharge limiting their application as a stand-alone energy storage device. A new hybrid supercapacitor with incorporated galvanic cell components was proposed to mitigate the self-discharge problem. The hybrid supercapacitor was similar to a conventional supercapacitor with two active carbon electrodes separated by a polymer electrolyte membrane containing 1.5 M zinc sulfate. However, a zinc foil and a copper foil were used as the current collectors for the negative and the positive electrodes respectively, which can provide a micro-current to compensate the self-discharge current. The hybrid supercapacitor exhibited a maximum specific capacitance of 55 F g− 1 and specific energy of 4.51 Wh kg−1 with a charge efficiency of 90%. The capacitance retention of the hybrid supercapacitor was 80% after 2000 cycles. The open circuit voltage of the charged hybrid supercapacitor was stable and declined slightly from initial 0.90 V–0.85 V in a month. The results demonstrate that via replacement of a pair of conventional metal current collectors with a galvanic couple the ubiquitous self-discharge problem can be significantly mitigated and the storage time can be prolonged to meet the requirement for stand-alone applications.
AB - Supercapacitors can provide a high specific power and long cycle life but suffer a significant self-discharge limiting their application as a stand-alone energy storage device. A new hybrid supercapacitor with incorporated galvanic cell components was proposed to mitigate the self-discharge problem. The hybrid supercapacitor was similar to a conventional supercapacitor with two active carbon electrodes separated by a polymer electrolyte membrane containing 1.5 M zinc sulfate. However, a zinc foil and a copper foil were used as the current collectors for the negative and the positive electrodes respectively, which can provide a micro-current to compensate the self-discharge current. The hybrid supercapacitor exhibited a maximum specific capacitance of 55 F g− 1 and specific energy of 4.51 Wh kg−1 with a charge efficiency of 90%. The capacitance retention of the hybrid supercapacitor was 80% after 2000 cycles. The open circuit voltage of the charged hybrid supercapacitor was stable and declined slightly from initial 0.90 V–0.85 V in a month. The results demonstrate that via replacement of a pair of conventional metal current collectors with a galvanic couple the ubiquitous self-discharge problem can be significantly mitigated and the storage time can be prolonged to meet the requirement for stand-alone applications.
KW - Galvanic cell
KW - Hybrid supercapacitor
KW - Self-discharge
UR - http://www.scopus.com/inward/record.url?scp=85053084234&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85053084234&partnerID=8YFLogxK
U2 - 10.1016/j.energy.2018.06.170
DO - 10.1016/j.energy.2018.06.170
M3 - Article
VL - 159
SP - 1035
EP - 1045
JO - Energy
JF - Energy
SN - 0360-5442
ER -