Electrochemical characteristics of flexible micro supercapacitors with reduced graphene oxide-carbon nanotubes composite electrodes

Kyungwhan Yang, Kyoungah Cho, Sangsig Kim

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)145-151
Number of pages7
JournalSuperlattices and Microstructures
Volume118
DOIs
Publication statusPublished - 2018 Jun

Bibliographical note

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

Keywords

  • Carbon nanotube
  • Flexible supercapacitors
  • High-scan rate
  • Micro supercapacitors
  • Reduced graphene oxide

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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