Hierarchical assembly of graphene/polyaniline nanostructures to synthesize free-standing supercapacitor electrode
Hierarchical assembly of graphene/polyaniline nanostructures to synthesize free-standing supercapacitor electrode
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DOI：
10.1016/j.compscitech.2014.04.007
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发表时间：
2014-06-27
影响因子：
9.1
通讯作者：
Gomes, Vincent G.
中科院分区：
文献类型：
--
作者：
Hassan, Mahbub;Reddy, Kakarla Raghava;Gomes, Vincent G.
合成了基于石墨烯/聚苯胺（PANI）纳米结构的自支撑复合薄膜，用于超级电容器应用。首先，通过微乳液聚合制备聚苯胺纳米球，然后通过分层组织掺入氧化石墨烯纳米片。阳离子 PANI 纳米球通过静电相互作用附着在阴离子 GO 片上，并通过定向自组装将 GO/PANI 纳米结构分层沉积在膜过滤器上。随后使用氢碘酸对 GO 进行原位化学还原，产生了具有 3D 开放结构互穿网络的明确石墨烯/PANI 纳米结构。原位 GO 减少使得层级组织保持完整。使用伏安图和奈奎斯特分析对所生产的柔性石墨烯/聚苯胺薄膜作为超级电容器电极进行测试。通过石墨烯和PANI纳米结构的协同组合，薄膜的电电容（448 F/g）提高了60%。在对样品进行 5000 次循环操作后，复合材料的容量保留率约为 81%，而单独的 PANI 容量保留率为 38%。 (C) 2014 Elsevier Ltd. 保留所有权利。
Free-standing composite films based on graphene/polyaniline (PANI) nanostructure were synthesized for supercapacitor application. First, polyaniline nanospheres were prepared by microemulsion polymerization, followed by the incorporation of graphene oxide nanosheets by hierarchical organization. The cationic PANI nanospheres were attached to the anionic GO sheets by electrostatic interaction and hierarchical deposition of GO/PANI nanostructures on a membrane filter via targeted self-assembly. Subsequent in situ chemical reduction of GO using hydroiodic acid produced well-defined graphene/PANI nanostructures having interpenetrating network with 3D open structure. The in situ GO reduction enabled keeping the hierarchical organization intact. The flexible graphene/PANI film produced was tested as a supercapacitor electrode using voltammograms and Nyquist analysis. The electro-capacitance of the film (448 F/g) was enhanced by 60% through the synergistic combination of graphene and PANI nanostructures. About 81% capacity retention was achieved for the composite compared to 38% for PANI alone after subjecting the samples to 5000 cyclic operations. (C) 2014 Elsevier Ltd. All rights reserved.