Electrochemical characteristics of flexible micro supercapacitors with reduced graphene oxide-carbon nanotubes composite electrodes. (June 2018)

• Record Type: Journal Article
• Authors: Yang, Kyungwhan; Cho, Kyoungah; Kim, Sangsig
• Is Part Of: Superlattices and microstructures. Volume 118(2018)
• Page Start: 145
• Page End: 151
• Publication Date: 2018-06
• Subjects: Micro supercapacitors -- Reduced graphene oxide -- Carbon nanotube -- High-scan rate -- Flexible supercapacitors; Superlattices as materials -- Periodicals; Microstructure -- Periodicals; Semiconductors -- Periodicals; Superréseaux -- Périodiques; Microstructure (Physique) -- Périodiques; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.spmi.2018.04.014
• Languages: English
• ISSNs: 0749-6036

Abstract

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/cm 2, 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. Graphical abstract: Highlights: The solid-state flexible MSCs were fabricated using rGO-CNT composite electrodes. The rGO-CNT MSCs show a large specific capacitance of 2.6 mF/cm 2 . The rGO-CNT MSCs show a high scan rate ability up to 100 V/s. The capacitive performances of the MSCs are maintained regardless of the array type.