Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , 29 Zhongguancun East Road, Haidian District, Beijing 100190, China.
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , 15 Beisanhuan East Road, Chaoyang District, Beijing 100029, China.
ACS Appl Mater Interfaces. 2016 May 11;8(18):11711-9. doi: 10.1021/acsami.6b01879. Epub 2016 May 2.
Fabrication of hybridized structures is an effective strategy to promote the performances of graphene-based composites for energy storage/conversion applications. In this work, macroporous structured graphene thin films (MGTFs) are fabricated on various substrates including flexible graphene papers (GPs) through an ice-crystal-induced phase separation process. The MGTFs prepared on GPs (MGTF@GPs) are recognized with remarkable features such as interconnected macroporous configuration, sufficient exfoliation of the conductive RGO sheets, and good mechanical flexibility. As such, the flexible MGTF@GPs are demonstrated as a versatile conductive platform for depositing conducting polymers (CPs), e.g., polyaniline (PAn), polypyrrole, and polythiophene, through in situ electropolymerization. The contents of the CPs in the composite films are readily controlled by varying the electropolymerization time. Notably, electrodeposition of PAn leads to the formation of nanostructures of PAn nanofibers on the walls of the macroporous structured RGO framework (PAn@MGTF@GPs): thereafter, the PAn@MGTF@GPs display a unique structural feature that combine the nanostructures of PAn nanofibers and the macroporous structures of RGO sheets. Being used as binder-free electrodes for flexible supercapacitors, the PAn@MGTF@GPs exhibit excellent electrochemical performance, in particular a high areal specific capacity (538 mF cm(-2)), high cycling stability, and remarkable capacitive stability to deformation, due to the unique electrode structures.
杂化结构的构建是一种有效策略，可以提高用于储能/转换应用的基于石墨烯的复合材料的性能。在这项工作中，通过冰晶诱导的相分离过程在各种基底上制造了具有大孔结构的石墨烯薄膜（MGTF），包括柔性石墨烯纸（GPs）。在 GPs 上制备的 MGTF（MGTF@GPs）具有互连通孔结构、导电 RGO 片充分剥离和良好的机械柔韧性等显著特点。因此，柔性 MGTF@GPs 被证明是一种多功能的导电平台，可通过原位电化学聚合沉积导电聚合物（CPs），例如聚苯胺（PAn）、聚吡咯和聚噻吩。通过改变电聚合时间，可以轻松控制复合膜中 CPs 的含量。值得注意的是，PAn 的电沉积导致 PAn 纳米纤维在大孔结构化 RGO 骨架的壁上形成纳米结构（PAn@MGTF@GPs）：此后，PAn@MGTF@GPs 具有独特的结构特征，结合了 PAn 纳米纤维的纳米结构和 RGO 片的大孔结构。作为无粘结剂的柔性超级电容器电极，PAn@MGTF@GPs 表现出优异的电化学性能，特别是高面比容量（538 mF cm(-2)）、高循环稳定性和对变形的显著电容稳定性，这归因于其独特的电极结构。
