TY - JOUR
T1 - Towards kilohertz electrochemical capacitors for filtering and pulse energy harvesting
AU - Fan, Zhaoyang
AU - Islam, Nazifah
AU - Bayne, Stephen B.
N1 - Funding Information:
This work is supported by National Science Foundation, United States (1611060). Z.F also acknowledges the support from GLEAMM. We greatly appreciate that Dr. John R. Miller from JME, Inc. & Case Western Reserve University reviewed the manuscript and offered his encouragement and critical comments on improving the manuscript quality.
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/9
Y1 - 2017/9
N2 - Electrochemical capacitors (ECs) are slow devices with charging and discharging rates limited below 1 Hz. They run at direct current and function as power source, but cannot afford the role of a conventional capacitor for current ripple filtering or pulse energy harvesting. Recently, developing ultrafast ECs that work at hundreds to kilohertz (kHz) frequency scope have attracted great interests, with the aim to replace the traditional aluminum electrolytic capacitors (AECs) that have bulky size and large equivalent series resistance. Compact kHz ECs would produce huge impacts on power design, power electronics and environmental pulse energy harvesting. Towards such a goal, the electrode material and its nanostructure are the keys to boost the response frequency of an EC from below 1 Hz to above 1 kHz. In this Review, we summarize guidelines on the electrode nanostructure design for kHz response, discuss the various carbonaceous materials and other highly conductive materials based electrode structures for kHz ECs. The configurations of higher voltage kHz ECs, and their dimension advantage over AECs are critically evaluated, followed with the outlook on the further study and development in this promising area.
AB - Electrochemical capacitors (ECs) are slow devices with charging and discharging rates limited below 1 Hz. They run at direct current and function as power source, but cannot afford the role of a conventional capacitor for current ripple filtering or pulse energy harvesting. Recently, developing ultrafast ECs that work at hundreds to kilohertz (kHz) frequency scope have attracted great interests, with the aim to replace the traditional aluminum electrolytic capacitors (AECs) that have bulky size and large equivalent series resistance. Compact kHz ECs would produce huge impacts on power design, power electronics and environmental pulse energy harvesting. Towards such a goal, the electrode material and its nanostructure are the keys to boost the response frequency of an EC from below 1 Hz to above 1 kHz. In this Review, we summarize guidelines on the electrode nanostructure design for kHz response, discuss the various carbonaceous materials and other highly conductive materials based electrode structures for kHz ECs. The configurations of higher voltage kHz ECs, and their dimension advantage over AECs are critically evaluated, followed with the outlook on the further study and development in this promising area.
KW - AC filtering
KW - Electrochemical capacitor
KW - Electrolytic capacitor
KW - High-frequency supercapacitor
KW - Kilohertz supercapacitor
KW - Nanostructured electrode
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U2 - 10.1016/j.nanoen.2017.06.048
DO - 10.1016/j.nanoen.2017.06.048
M3 - Review article
AN - SCOPUS:85022022888
SN - 2211-2855
VL - 39
SP - 306
EP - 320
JO - Nano Energy
JF - Nano Energy
ER -