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VERTICALLY-ALIGNED GRAPHENE-CARBON FIBER HYBRID ELECTRODES AND METHODS FOR MAKING SAME
VERTICALLY-ALIGNED GRAPHENE-CARBON FIBER HYBRID ELECTRODES AND METHODS FOR MAKING SAME
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机译:垂直排列的石墨烯 - 碳纤维混合电极和制造方法
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摘要
Graphene electrodes-based supercapacitors are in demand due to superior electrochemical characteristics. However, commercial applications have been limited by inferior electrode cycle life. A method to fabricate highly efficient supercapacitor electrodes using pristine graphene sheets vertically-stacked and electrically connected to the carbon fibers which results in vertically-aligned graphene-carbon fiber nanostructure is disclosed. The vertically-aligned graphene-carbon fiber electrode prepared by electrophoretic deposition possesses a mesoporous three-dimensional architecture which enabled faster and efficient electrolyte-ion diffusion with a specific capacitance of 333.3 F g−1. The electrodes have electrochemical cycling stability of more than 100,000 cycles with 100% capacitance retention. Apart from the electrochemical double layer charge storage, the oxygen-containing surface moieties and α-Ni(OH)2 present on the graphene sheets enhance the charge storage by faradaic reactions. This enables the assembled device to provide a gravimetric energy density of 76 W h kg−1 with a 100% capacitance retention even after 1,000 bending cycles.
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机译:由于卓越的电化学特性,石墨烯电极的超级电容器有需求。然而,商业应用受到较差的电极循环寿命的限制。公开了一种制造高效超级涂物电极的方法,所述原始石墨烯片垂直堆叠和电连接到导致垂直排列的石墨烯 - 碳纤维纳米结构的碳纤维。通过电泳沉积制备的垂直排列的石墨烯 - 碳纤维电极具有介孔的三维架构,其使能够具有更快,有效的电解质离子扩散,其特定电容为333.3f g -1 。电极具有大于100,000个循环的电化学循环稳定性,具有100%电容保持。除了电化学双层电荷储存之外,存在于石墨烯片上的含氧表面部分和α-Ni(OH) 2 增强了法拉第反应的电荷储存。这使得组装装置能够提供76WH kg -1 -1 -1 / sup>的重量能量密度,即使在1,000次弯曲循环之后,也具有100%电容保留。
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