TY - JOUR
T1 - Electrochemical characteristics of flexible micro supercapacitors with reduced graphene oxide-carbon nanotubes composite electrodes
AU - Yang, Kyungwhan
AU - Cho, Kyoungah
AU - Kim, Sangsig
N1 - Funding Information:
This work was supported in part by the Mid-career Researcher Program (No. NRF-2016R1E1A1A02920171 ) and the Technology Development Program to Solve Climate Changes ( NRF-2017M1A2A2087323 ), and the Brain Korea 21 Plus Project in 2018 through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning and the Korea University Grant.
Publisher Copyright:
© 2018 Elsevier Ltd
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/6
Y1 - 2018/6
N2 - In this study, we fabricate solid-state flexible micro-supercapacitors (MSCs) with reduced graphene oxide-carbon nanotube (rGO-CNT) composite electrodes and investigate the electrochemical characteristics by comparing with those of an MSC with rGO electrodes. Regarding the resistance-capacitance time constant and IR drop, the addition of CNTs into the rGO electrodes shows a significant effect owing to both the decrease in the resistance and the increase in the permeability of the electrolytes. Compared to the rGO MSCs, the rGO-CNT MSCs show an excellent areal capacitance of 2.6 mF/cm2, a smaller IR drop of 11 mV, a lower RC time constant of 6 ms, and faster charging/discharging rates with a high scan rate ability up to 100 V/s. The mechanical stability of the flexible rGO-CNT MSCs is verified by 1000 bending cycles. In addition, the electrochemical characteristics of the flexible rGO-CNT MSCs are maintained regardless of the MSC array type.
AB - In this study, we fabricate solid-state flexible micro-supercapacitors (MSCs) with reduced graphene oxide-carbon nanotube (rGO-CNT) composite electrodes and investigate the electrochemical characteristics by comparing with those of an MSC with rGO electrodes. Regarding the resistance-capacitance time constant and IR drop, the addition of CNTs into the rGO electrodes shows a significant effect owing to both the decrease in the resistance and the increase in the permeability of the electrolytes. Compared to the rGO MSCs, the rGO-CNT MSCs show an excellent areal capacitance of 2.6 mF/cm2, a smaller IR drop of 11 mV, a lower RC time constant of 6 ms, and faster charging/discharging rates with a high scan rate ability up to 100 V/s. The mechanical stability of the flexible rGO-CNT MSCs is verified by 1000 bending cycles. In addition, the electrochemical characteristics of the flexible rGO-CNT MSCs are maintained regardless of the MSC array type.
KW - Carbon nanotube
KW - Flexible supercapacitors
KW - High-scan rate
KW - Micro supercapacitors
KW - Reduced graphene oxide
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U2 - 10.1016/j.spmi.2018.04.014
DO - 10.1016/j.spmi.2018.04.014
M3 - Article
AN - SCOPUS:85047613142
SN - 0749-6036
VL - 118
SP - 145
EP - 151
JO - Superlattices and Microstructures
JF - Superlattices and Microstructures
ER -