Hydrothermal direct synthesis of polyaniline, graphene/polyaniline and N-doped graphene/polyaniline hydrogels for high performance flexible supercapacitors
Hydrothermal direct synthesis of polyaniline, graphene/polyaniline and N-doped graphene/polyaniline hydrogels for high performance flexible supercapacitors
复制标题
水热直接合成聚苯胺、石墨烯/聚苯胺和氮掺杂石墨烯/聚苯胺水凝胶用于高性能柔性超级电容器
DOI：
10.1039/c8ta01366g
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发表时间：
2018
影响因子：
11.9
通讯作者：
Wantai Yang
中科院分区：
文献类型：
--
作者：
Yubo Zou;Zhicheng Zhang;Wenbin Zhong;Wantai Yang
电活性水凝胶被认为是一种柔性固态超级电容器电极材料。本文提出了一种在水热过程中由可溶聚苯胺分散体通过分子自交联直接制备聚苯胺水凝胶的新策略。聚苯胺水凝胶单电极具有较高的比电容（325℉g−1）和优良的倍率性能。为了获得更优异的电化学性能，采用氧化石墨烯（GO）和可溶聚苯胺分散体制备了石墨烯/聚苯胺水凝胶（GPH7）。然而，由于氧化石墨烯和聚苯胺分子之间的强相互作用，GPH7单电极的比电容（375 F g−1）略有增强。特别有趣的是，在氧化石墨烯和聚苯胺体系中掺入间苯二胺（mPD）可以保护聚苯胺固有的共轭结构，因此制备的n掺杂石墨烯/聚苯胺水凝胶（GMPH7）具有显著提高的比电容（514.3 F g−1）。此外，基于聚苯乙烯水凝胶、GPH7和GMPH7组装的柔性固态超级电容器具有优异的面比电容（分别为484,519.2和584.7 mF cm−2），2000次机械弯曲循环后电容保持率约为100%，良好的能量密度（分别为42.96、60.9和81.28 μW h cm−2）。这种水凝胶组装的超级电容器具有强大的电容性能和出色的灵活性，在柔性和可穿戴电子产品中应用前景广阔。
Electroactive hydrogels have been considered as flexible solid-state supercapacitor electrode materials. Herein, a novel strategy has been proposed to directly prepare polyaniline (PANI) hydrogels from soluble PANI dispersion by self-crosslinking of molecules during the hydrothermal process. The PANI hydrogel single-electrode shows high specific capacitance (325 F g−1) and superior rate capability. To achieve more excellent electrochemical performance, the graphene/PANI hydrogel (GPH7) is prepared using graphene oxide (GO) and soluble PANI dispersion. However, a slightly enhanced specific capacitance (375 F g−1) is achieved for the GPH7 single-electrode, due to the strong interactions between GO and PANI molecules. It is of particular interest that the incorporation of m-phenylenediamine (mPD) into the GO and PANI system could protect the inherent conjugated structure of PANI, and thereby the as-prepared N-doped graphene/PANI hydrogels (GMPH7) show significantly improved specific capacitance (514.3 F g−1). Moreover, the assembled flexible solid-state supercapacitors based on the PANI hydrogel, GPH7 and GMPH7 exhibit excellent areal specific capacitance (484, 519.2 and 584.7 mF cm−2, respectively), approximately 100% capacitance retention after 2000 mechanical bending cycles and favorable energy density (42.96, 60.9 and 81.28 μW h cm−2, respectively). Such hydrogel assembled supercapacitors with robust capacitive behavior and outstanding flexibility are promising for applications in flexible and wearable electronics.