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Graphene/carbon aerogels derived from graphene crosslinked polyimide as electrode materials for supercapacitors

机译：源自石墨烯交联聚酰亚胺的石墨烯/碳气凝胶作为超级电容器的电极材料

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Carbon aerogels with hierarchical porous structures are highly promising for developing novel electrode materials for supercapacitors due to their substantial active sites for ion and electron transfer. Herein, a new type of graphene/carbon aerogels with multimodal pores have been facilely synthesized via carbonization of graphene crosslinked polyimide aerogels. Compared to most carbon aerogels based on organic aerogels reported previously, this preparation process is facilitated by the exclusion of harmful formaldehyde. Moreover, graphene is demonstrated as a powerful crosslinking agent, allowing acceleration of the gelation process, improvement of the porous structures inside carbon aerogels, and enlargement of specific surface area and conductivity of carbon aerogels. SEM observation shows the multimodal pores and three-dimensional nano-network of carbon aerogels, which provide short diffusion lengths for both charge and ion transport and high electroactive regions. With graphene involved, the as-prepared carbon aerogels possess high specific surface area up to 998.7 m(2) g(-1) and specific capacitance up to 178.1 F g(-1) at a current density of 1 A g(-1), which is much higher than that of pure carbon aerogels (193.6 m(2) g(-1) and 104.2 F g(-1)). This work provides a new and facile avenue for fabricating high performance carbon aerogels with hierarchical structures and broadens the potential applications of polyimide.
机译：具有层级多孔结构的碳气凝胶由于其大量的离子和电子转移活性位点，在开发用于超级电容器的新型电极材料方面非常有前途。本文中，已经通过石墨烯交联的聚酰亚胺气凝胶的碳化容易地合成了具有多峰孔的新型石墨烯/碳气凝胶。与以前报道的大多数基于有机气凝胶的碳气凝胶相比，该制备过程由于排除了有害的甲醛而变得容易。此外，石墨烯被证明是一种强大的交联剂，可以加速凝胶化过程，改善碳气凝胶内部的多孔结构，并扩大比表面积和碳气凝胶的电导率。 SEM观察显示碳气凝胶的多峰孔隙和三维纳米网络，为电荷和离子传输以及高电活性区域提供了短的扩散长度。在石墨烯的作用下，所制备的碳气凝胶在1 A g（-1）的电流密度下具有高达998.7 m（2）g（-1）的高比表面积和高达178.1 F g（-1）的比电容。 ），比纯碳气凝胶（193.6 m（2）g（-1）和104.2 F g（-1））高得多。这项工作为制造具有分层结构的高性能碳气凝胶提供了新的便捷途径，并拓宽了聚酰亚胺的潜在应用。

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