无限互溶共溶剂制备高电化学性能石墨烯/聚苯胺均相复合材料

The formation of uniform graphene-polyaniline hybrids using a completely miscible cosolvent that have an excellent electrochemical performance

石墨烯/聚苯胺复合材料的电化学性能很大程度上由其微观结构形貌和聚苯胺在石墨烯片层上的分布情况决定。在制备该复合材料时,两者的均相分布对于解决石墨烯片层的堆叠以及聚苯胺纳米结构的团聚至关重要。常见的聚苯胺/石墨烯均相复合材料制备方法,如逐层自组装或电化学原位聚合等,流程复杂、难以实现大规模生产。本文采用N,N-二甲基甲酰胺和水组成的互溶共溶剂成功地实现了石墨烯和聚苯胺的均相复合,通过共溶剂这一方式解决了上述所面临的问题。使用共溶剂的复合纤维展现出均相分布的微观结构,且聚苯胺均匀分布在石墨烯片层上,而相对比于只用水作为溶剂制备的复合纤维并未展现出均相复合的微观结构,使用共溶剂得到的复合纤维显示出优异的电化学性能。更重要的是通过共溶剂这一简单有效的策略,有望实现大规模生产两种成分均相分布且性能优异的石墨烯/聚苯胺复合材料。

The electrochemical properties of graphene-polyaniline(PANI)hybrids are largely determined by their microstructures and the distribution of PANI on the graphene network.Uniform hybridization of each component is critical to avoid the restacking of the graphene sheets and the agglomeration of PANI nanoassemblies during the use of the hybrids.Conventional strategies,such as layer-by-layer assembly or electrochemical in-situ polymerization,involve intricate procedures,making it difficult to achieve the large-scale production of the hybrids.We report a completely miscible cosolvent consisting of N,N-dimethylformamide and water that solves this problem and was used to produce graphene-PANI hybrid flexible fibers.It was found that the composite fiber had a homogeneous microstructure with PANI nanoassemblies uniformly distributed on the graphene sheets,and had outstanding electrochemical properties,much better than the counterpart fabricated using only water as the solvent.The work proposes a universal but simple strategy to achieve the mass production of graphene-PANI hybrids or similar materials with uniform hybridization of the two components.