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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碳纳米纤维的杂种

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摘要

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：1M锂双（三氟甲磺酰磺酰内酰亚胺）电解质中的特殊类型的炭黑（CB）的水分散体主要由水性电解质朝向Cb颗粒的亲和力而不是粒径来控制。尽管其小粒径（30nm），这种类型的Cb形成三维开放网络，其在具有增强的流变和电性能的相对高的阈值（2.0wt％）处具有流变学和电渗滤。在这种渗透阈值下，用当量碳纳米纤维（CNFS）替换痕量的Cb产生具有较高导电性的混合分散体和与纯Cb分散体的相当流变行为。该混合分散体由协作支撑网络支配，该网络由柔性丝纳米纤维连带，使得它能够在流动条件下恢复导电性损失，因为流动引起的CB的导电通路的分解并且可能持续更高负载活性材料。该发现表明将杂种分散体作为具有含水半固体氧化还原流动细胞水溶液的配制的有前途的前体。

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  • 来源
    《RSC Advances》 |2018年第56期|共13页
  • 作者

    Youssry Mohamed; Kamand Fadi Z.; Magzoub Musaab I.; Nasser Mustafa S.;

  • 作者单位

    Qatar Univ Coll Arts &

    Sci Dept Chem &

    Earth Sci POB 2713 Doha Qatar;

    Qatar Univ Coll Arts &

    Sci Dept Chem &

    Earth Sci POB 2713 Doha Qatar;

    Qatar Univ Coll Engn Gas Proc Ctr POB 2713 Doha Qatar;

    Qatar Univ Coll Engn Gas Proc Ctr POB 2713 Doha Qatar;

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  • 正文语种 eng
  • 中图分类 化学;
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