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AuthorYoussry M.
AuthorKamand F.Z.
AuthorMagzoub M.I.
AuthorNasser M.S.
Available date2020-02-05T08:54:08Z
Publication Date2018
Publication NameRSC Advances
ResourceScopus
ISSN20462069
URIhttp://dx.doi.org/10.1039/c8ra05446k
URIhttp://hdl.handle.net/10576/12815
AbstractThe 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. 2018 The Royal Society of Chemistry.
SponsorM. Youssry would like thank Cabot Corporation, USA and 3M, France for providing, respectively, the carbon black and lithium salt, and Dr Nasr Bensalah for helping in conducting the impedance spectra. We would like to thank the staff of Central Lab Unit at Qatar University for performing SEM and Raman spectra. This work was partially supported by an internal grant (QUST-CAS-SPR-2017-6) from Qatar University.
Languageen
PublisherRoyal Society of Chemistry
TitleAqueous dispersions of carbon black and its hybrid with carbon nanofibers
TypeArticle
Pagination32119-32131
Issue Number56
Volume Number8
dc.accessType Open Access


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