ORALS
SESSION: AdvancedMaterialsWedAM-R6
| 4th Intl. Symp. on New and Advanced Materials and Technologies for Energy, Environment and Sustainable Development |
| Wed Nov, 7 2018 / Room: Guaratiba (60/2nd) | |
| Session Chairs: Patrick Ching-Ho Hsieh; Udo Schwingenschlogl; Session Monitor: TBA |
12:10: [AdvancedMaterialsWedAM03]
High Effective Surface Area Electrodes by Electrochemically-induced Swelling of Aligned CNT Fibers Katarzyna
Krukiewicz1 ; Roman
Turczyn
1 ; John
Bulmer
2 ; Krzysztof
Koziol
3 ;
1Silesian University of Technology, Gliwice, Poland;
2University of Cambridge, Cambridge, United Kingdom;
3University of Cambridge, Cranfield, United Kingdom;
Paper Id: 310
[Abstract] Fibers made purely of aligned carbon nanotubes (ACNT) exhibit remarkable properties, such as high specific strength, stiffness, electrical and thermal conductivity, as well as extreme flexibility [1-3]. The uniqueness of ACNT fibers lies in the fact that during the application of certain potentials they undergo the unusual process of swelling [4]. Since this process leads to the increase in radial dimension and effective surface area, swollen ACNT fibers can be considered as advantageous materials for electrodes in ion batteries and supercapacitors. In this paper, we demonstrate that through the process of swelling, the effective surface area of ACNT fiber can be significantly increased. The effect of swelling on the enlargement of effective surface area is extensively investigated by means of chronoamperometry in the function of applied potential and time of potential application. It is shown that by the careful choice of swelling process parameters, it is possible to increase the effective surface area of ACNT fiber up to 450 times when compared with the initial geometric area of the fiber, reaching the specific effective surface area of 7.5 m2 g-1.
References:
[1] K. Koziol, J. Vilatela, A. Moisala, M. Motta, P. Cunniff, M. Sennett, et al., Science 318 (2007) 1892-1895.
[2] C. Paukner, K. Koziol, Sci. Rep. 4 (2014) 3903-3909.
[3] A.S. Wu, T.W. Chou, Mater. Today 15 (2012) 302-310.
[4] K. Krukiewicz, J.S. Bulmer, K.K.K. Koziol, J.K. Zak, Electrochem. Commun. 64 (2016) 30-34.
