Issue 56, 2018

Aqueous dispersions of carbon black and its hybrid with carbon nanofibers

Abstract

The aqueous dispersions of a special type of carbon black (CB) in 1 M lithium bis(trifluoromethanesulfonimide) electrolyte is mainly controlled by the affinity of the aqueous electrolyte towards the CB particles rather than the particle size. In spite of its small particle size (30 nm), this type of CB forms a three-dimensional open network which is rheologically and electrically percolated at a relatively high threshold (2.0 wt%) with enhanced rheological and electrical properties. At this percolating threshold, replacing a trace amount of CB with equivalent carbon nanofibers (CNFs) produces hybrid dispersions with higher electrical conductivity and comparable rheological behavior to pure CB dispersions. This hybrid dispersion is dominated by a cooperatively supporting network, which is wired by the flexible filamentous nanofibers so that it is able to recover the conductivity loss under flow conditions due to flow-induced breaking up of the conductive pathways of CB and presumably sustain a higher load of active materials. This finding suggests hybrid dispersions as a promising precursor in the formulation of electrode suspensions for aqueous semi-solid redox flow cells.

Graphical abstract: Aqueous dispersions of carbon black and its hybrid with carbon nanofibers

Article information

Article type
Paper
Submitted
25 jun 2018
Accepted
12 sep 2018
First published
17 sep 2018
This article is Open Access
Creative Commons BY license

RSC Adv., 2018,8, 32119-32131

Aqueous dispersions of carbon black and its hybrid with carbon nanofibers

M. Youssry, F. Z. Kamand, M. I. Magzoub and M. S. Nasser, RSC Adv., 2018, 8, 32119 DOI: 10.1039/C8RA05446K

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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