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Polypyrrole thin film on electrochemically modified graphite surface for mechanically stable and high-performance supercapacitor electrodes
Electrochimica Acta ( IF 6.6 ) Pub Date : 2018-07-17 , DOI: 10.1016/j.electacta.2018.07.091
C. Justin Raj , Ramu Manikandan , Won-Gil Lee , Won-Je Cho , Kook Hyun Yu , Byung Chul Kim

A few-layer graphene oxide-based supercapacitor electrode was fabricated via direct and controlled electrochemical exfoliation of graphite in 0.1 M H2SO4 electrolyte. The graphite electrode exfoliated for a 5 min reaction shows the presence of a few layers of graphene oxide on the surface and exhibited excellent electrochemical performance with a maximum areal capacitance of 993 mF cm−2. However, the electrode failed to retain its surface state under continuous charge/discharge cycles due to the subsequent exfoliation of graphene layers from the graphite surface. But, the deposition of a thin polypyrrole layer effectively reinforces the surface states of the electrode with better mechanical stability as well as electrochemical performances. The fabricated graphite/graphene oxide/polypyrrole electrode showed an improved areal capacitance of 1320 mF cm−2. Moreover, the electrode exhibited ∼83% cyclic stability after 5000 charge/discharge cycles, which is higher than the stability of graphite/graphene oxide electrode (67%).



中文翻译:

电化学修饰石墨表面上的聚吡咯薄膜,用于机械稳定和高性能的超级电容器电极

通过在0.1 M H 2 SO 4电解质中对石墨进行直接和受控的电化学剥落,制造了几层基于氧化石墨烯的超级电容器电极。剥落5分钟的石墨电极显示表面上存在几层氧化石墨烯,并具有出色的电化学性能,最大面电容为993 mF cm -2。。然而,由于石墨烯层随后从石墨表面剥落,电极在连续的充电/放电循环下未能保持其表面状态。但是,薄的聚吡咯层的沉积有效地增强了电极的表面状态,并具有更好的机械稳定性以及电化学性能。所制造的石墨/氧化石墨烯/聚吡咯电极显示出改善的1320mF cm -2的面电容。此外,在5000次充/放电循环后,电极的循环稳定性约为83%,高于石墨/氧化石墨烯电极的稳定性(67%)。

更新日期:2018-07-17
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