Fabrication of high performance flexible micro-supercapacitor arrays with hybrid electrodes of MWNT/V2O5 nanowires integrated with a SnO2 nanowire UV sensor

Daeil Kim, Junyeong Yun, Geumbee Lee, Jeong Sook Ha

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

We report on the on-chip fabrication of high performance flexible micro-supercapacitor (MSC) arrays with hybrid electrodes of multi-walled carbon nanotube (MWNT)/V2O5 nanowire (NW) composites and a solid electrolyte, which could power the SnO2 NW UV sensor integrated on the same flexible substrate. The patterned MSC using hybrid electrodes of MWNT/V2O5 NW composites with 10 vol% of V2O5 NWs exhibited excellent electrochemical performance with a high volume capacitance of 80 F cm-3 at a scan rate of 10 mV s-1 in a PVA-LiCl electrolyte and good cycle performance to maintain 82% of the capacitance after 10 000 cycles at a current density of 11.6 A cm-3. The patterned MSC also showed an excellent energy density of 6.8 mW h cm-3, comparable to that of a Li-thin film battery (1-10 mW h cm-3), and a power density of 80.8 W cm-3 comparable to that of state-of-the-art MSCs. In addition, the flexible MSC array on a PET substrate showed mechanical stability over bending with a bending radius down to 1.5 mm under both compressive and tensile stress. Even after 1000 bending cycles at a bending radius of 7 mm, 94% of the initial capacitance was maintained. Furthermore, we have shown the operation of a SnO2 NW UV sensor using such a fabricated MSC array integrated into the same circuit on the PET substrate.

Original languageEnglish
Pages (from-to)12034-12041
Number of pages8
JournalNanoscale
Volume6
Issue number20
DOIs
Publication statusPublished - 2014 Jan 1

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Carbon Nanotubes
Nanowires
Carbon nanotubes
Fabrication
Electrodes
Sensors
Capacitance
Substrates
Mechanical stability
Solid electrolytes
Composite materials
Compressive stress
Tensile stress
Electrolytes
Current density
Supercapacitor
vanadium pentoxide
Thin films
Networks (circuits)

Cite this

Fabrication of high performance flexible micro-supercapacitor arrays with hybrid electrodes of MWNT/V2O5 nanowires integrated with a SnO2 nanowire UV sensor. / Kim, Daeil; Yun, Junyeong; Lee, Geumbee; Ha, Jeong Sook.

In: Nanoscale, Vol. 6, No. 20, 01.01.2014, p. 12034-12041.

Research output: Contribution to journalArticle

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