Issue 24, 2014

Series asymmetric supercapacitors based on free-standing inner-connection electrodes for high energy density and high output voltage

Abstract

Asymmetric supercapacitors (ASCs) based on free-standing membranes with high energy density and high output voltage are reported. MnO2 nanowire/carbon nanotube (CNT) composites and MoO3 nanobelt/CNT composites are selected as the anode and the cathode materials of the devices, respectively. The ASC has a high volumetric capacitance of 50.2 F cm−3 at a scan rate of 2 mV s−1 and a high operation voltage window of 2.0 V. Especially, after a middle layer with an inner-connection structure was inserted between the anode and the cathode, the output voltage of the whole device can achieve 4.0 V. The full cell of series ASCs (SASC) with an inner-connection middle layer has a high energy density of 28.6 mW h cm−3 at a power density of 261.4 mW cm−3, and exhibits excellent cycling performance of 99.6% capacitance retention over 10 000 cycles. This strategy of designing the hybridized structure for SASCs provides a promising route for next-generation SCs with high energy density and high output voltage.

Graphical abstract: Series asymmetric supercapacitors based on free-standing inner-connection electrodes for high energy density and high output voltage

Supplementary files

Article information

Article type
Paper
Submitted
24 Aug 2014
Accepted
05 Oct 2014
First published
07 Oct 2014

Nanoscale, 2014,6, 15073-15079

Author version available

Series asymmetric supercapacitors based on free-standing inner-connection electrodes for high energy density and high output voltage

J. Tao, N. Liu, J. Rao, L. Ding, M. R. AL Bahrani, L. Li, J. Su and Y. Gao, Nanoscale, 2014, 6, 15073 DOI: 10.1039/C4NR04819A

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