Imperial College London
Alternate

Prof Milo Shaffer

Faculty of Natural Sciences, Department of Chemistry

Professor of Materials Chemistry
 
 
 
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Contact

 

+44 (0)20 7594 5825m.shaffer Website

 
 
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Assistant

 

Mr John Murrell +44 (0)20 7594 2845

 
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Location

 

401BMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Sirisinudomkit:2021:10.1039/D0MA00898B,
author = {Sirisinudomkit, P and Senokos, E and Rubio, Carrero N and Shaffer, M},
doi = {10.1039/D0MA00898B},
journal = {Materials Advances},
pages = {1981--1992},
title = {Reductive processing of single walled carbon nanotubes for high volumetric performance supercapacitors},
url = {http://dx.doi.org/10.1039/D0MA00898B},
volume = {2},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Intrinsically, single walled carbon nanotubes (SWCNTs) are excellent candidates for electrochemical double layer supercapacitor (EDLC) electrodes, owing to their high electrical conductivity, high accessible surface area, and high aspect ratio/connectivity, which provide exceptional intrinsic gravimetric energy and power densities. However, in practice, local bundling due to strong intertube van der Waals interactions reduces the effective surface area; at larger scales, the bundling also creates low density networks that limit the volumetric electrochemical performance of practical electrodes. In this study, reductive charging is used to dissolve individual SWCNTs and assemble them to form relatively dense (0.34 g cm−3), thick (38 μm) ‘buckypaper’ electrodes, with high electrical conductivity (>400 S cm−1). Intermediate charging ratios (C:Na = 10:1) and carbon concentrations (0.125 M) provide greater SWCNT solubilisation and individualisation, and correlate with maximum volumetric capacitance of 74 F cmelectrode−3 at 10 mV s−1 in 1 M H2SO4. These optimised half-cell electrodes were implemented in full symmetric cell devices, prepared in both aqueous and ionic liquid electrolytes, using a bespoke bacterial cellulose (BC) ultrathin separator (7 microns) to minimize parasitic mass/volume. The full cell performance in ionic liquid reached maximum energy and power densities of 2.6 Wh kg−1 (2.2 mWh cm−3), and 10.2 kW kg−1 (8.3 W cm−3), respectively, normalised by the total mass and volume of device (electrodes, electrolyte, and separator; no separate current collector is needed). The relatively effective transfer of half-cell to full-cell performance is encouraging but could be optimized further in future. Appropriate normalisations for supercapacitor electrodes and devices are discussed in detail. Thin BC-based separators have wide applicability to other electrochemical devices.
AU  - Sirisinudomkit,P
AU  - Senokos,E
AU  - Rubio,Carrero N
AU  - Shaffer,M
DO  - 10.1039/D0MA00898B
EP  - 1992
PY  - 2021///
SN  - 2633-5409
SP  - 1981
TI  - Reductive processing of single walled carbon nanotubes for high volumetric performance supercapacitors
T2  - Materials Advances
UR  - http://dx.doi.org/10.1039/D0MA00898B
UR  - https://pubs.rsc.org/en/content/articlelanding/2021/MA/D0MA00898B
UR  - http://hdl.handle.net/10044/1/87661
VL  - 2
ER  -
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