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Aqueous dispersions of carbon black and its hybrid with carbon nanofibers

机译：炭黑的水分散体及其与碳纳米纤维的杂化

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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.
机译：特殊类型的炭黑（CB）在1 M双（三氟甲烷磺酰亚胺）锂电解质中的水分散液主要受水性电解质对CB颗粒的亲和力而不是粒度控制。尽管其粒径小（30 nm），但这种类型的CB形成了三维开放网络，该网络在相对较高的阈值（2.0 wt％）上具有较高的流变学和电学特性，在流变和电学上渗透。在此渗透阈值下，用等效碳纳米纤维（CNF）替代痕量的CB会产生具有更高电导率和与纯CB分散体相当的流变行为的混合分散体。这种杂化分散体由协作支持网络主导，该网络由柔性丝状纳米纤维连接，因此它能够恢复由于流动引起的CB导电路径断裂而在流动条件下的电导率损失，并可能维持较高的电导率。活性材料的负荷。这一发现表明，在水性半固体氧化还原流通池的电极悬浮液配方中，杂化分散体是有希望的前体。

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