Issue 4, 2015

Novel scalable synthesis of highly conducting and robust PEDOT paper for a high performance flexible solid supercapacitor

Abstract

A novel synthetic strategy has been developed for the preparation of a highly conducting polyethylenedioxythiophene (PEDOT) phase on flexible cellulose paper by inducing surfactant-free interfacial polymerization at the interface of two immiscible liquids. The process is highly scalable in that very large flexible PEDOT papers can be prepared in 2–3 h under laboratory conditions. The PEDOT paper possesses efficiently packed π-conjugated chains and offers the possibility of increased doping levels, confirmed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-Vis measurement. This useful development was achieved by slow polymerization, coupled with the high dielectric constant of the interface, which stabilised the counter-ions by hydrogen bonding. This gave improved intra-chain charge mobility, leading to conductivity as high as 375 S cm−1, much higher than for PEDOT prepared in n-butanol, typically 30 S cm−1. A low sheet resistance of 3 Ω □−1 was achieved by multiple coating, and this was found to be stable even after two months in ambient conditions and under a variety of flexible and bending conditions. A flexible solid-state supercapacitor with overall thickness 0.17 mm made from the PEDOT paper and PVA–H2SO4 as the solid electrolyte exhibited a volumetric energy density of 1 mW h cm−3. The specific capacitance measured per unit mass of PEDOT in the system was 115 F g−1, together with a high volumetric capacitance of 145 F cm−3. These observed values were significantly higher than those for bulk PEDOT tested on solid current collectors, and also than the highest values quoted in the literature. The flexible devices were found to be very stable during charge–discharge cycling under twisted and bending conditions over more than 3800 cycles. A 3.6 V inter-digitized flexible device was also made using a single PEDOT paper, and was found to be sufficiently powerful to cause an LED to glow under flexible conditions.

Graphical abstract: Novel scalable synthesis of highly conducting and robust PEDOT paper for a high performance flexible solid supercapacitor

Supplementary files

Article information

Article type
Paper
Submitted
15 Jan 2015
Accepted
30 Jan 2015
First published
04 Feb 2015

Energy Environ. Sci., 2015,8, 1339-1347

Novel scalable synthesis of highly conducting and robust PEDOT paper for a high performance flexible solid supercapacitor

B. Anothumakkool, R. Soni, S. N. Bhange and S. Kurungot, Energy Environ. Sci., 2015, 8, 1339 DOI: 10.1039/C5EE00142K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements