Graphene/carbon black hybrid film for flexible and high rate performance supercapacitor
Graphene/carbon black hybrid film for flexible and high rate performance supercapacitor
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用于柔性高倍率性能超级电容器的石墨烯/炭黑混合薄膜
DOI：
10.1016/j.jpowsour.2014.08.007
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发表时间：
2014-12-20
影响因子：
9.2
通讯作者：
Jia, Dechang
中科院分区：
文献类型：
--
作者：
Wang, Yaming;Chen, Junchen;Jia, Dechang
通过简单的真空过滤方法制备了不同炭黑（CB）含量的还原氧化石墨烯/炭黑（rGO/CB）杂化薄膜。 CB颗粒均匀分布在石墨烯层之间，不仅防止了rGO片的紧凑重新堆叠，而且还提供了rGO片的基面之间的电接触。正如预期的那样，与 rGO 薄膜相比，所制备的 rGO/CB 杂化薄膜表现出增强的倍率性能。此外，利用聚乙烯醇（PVA）/H2SO4凝胶作为电解质，以镀金PET薄膜作为集流体和机械支撑，采用优化的rGO/CB混合薄膜构建了固态柔性超级电容器。该固态柔性超级电容器在5 mV s(-1)扫描速率下表现出112 F g(-1)的比电容，在1 V s(-1)的高扫描速率下表现出优异的倍率性能，比电容为79.6 F g(-1)。此外，柔性固态超级电容器表现出良好的循环稳定性，正常状态下3000次循环加上弯曲状态下2000次循环后电容保持率为94%。 (C) 2014 Elsevier B.V. 保留所有权利。
Reduced graphene oxide/carbon black (rGO/CB) hybrid films with different carbon black (CB) contents are prepared by a simple vacuum filtration method. The CB particles evenly distribute between the graphene layers, not only preventing the compact restack of rGO sheets but also providing electrical contact between the base planes of rGO sheets. As expected, the as-prepared rGO/CB hybrid film shows enhanced rate capability when compared with rGO film. Furthermore, a solid-state flexible supercapacitor has been constructed with the optimized rGO/CB hybrid film by using polyvinyl alcohol (PVA)/H2SO4 gel as electrolyte and Au coated PET film as current collector and mechanical support. The solid-state flexible supercapacitor shows a specific capacitance of 112 F g(-1) at a scan rate of 5 mV s(-1), and excellent rate performance with a specific capacitance of 79.6 F g(-1) at a high scan rate of 1 V s(-1). Moreover, the flexible solid-state supercapacitor exhibits good cycling stability with capacitance retention of 94% after 3000 cycles in normal state plus 2000 cycles in bent state. (C) 2014 Elsevier B.V. All rights reserved.