Extraordinarily high-rate capability of polyaniline nanorod arrays on graphene nanomesh

By Gao, Shuangyan; Zang, Peiyu; Dang, Liqin; Xu, Hua; Shi, Feng; Liu, Zonghuai; Lei, Zhibin
Published in Journal of Power Sources NULL 2016

Abstract

Abstract We report the high-rate capacitive performance of polyaniline (PANI) coated on graphene nanomesh (GNM). The {PANI} on {GNM} sheets shows vertical nanorod arrays that offer large electrochemically active surface area and numerous ion-accessible gaps. Benefiting from the highly pseudocapacitive {PANI} and ion-penetrable GNM, GNM-PANI with 70 wt% {PANI} exhibits a specific capacitance of 452 F g?1 at 1.0 A g?1, which remains at 404 F g?1 even at high discharge rate of 50 A g?1 in 1.0 M H2SO4. More importantly, a symmetric capacitor built with this electrode exhibits a relaxation time constant of 2.61 s, a value comparable to 2-5 s with activated carbon as electrode, and much shorter than 4-6 s of capacitors with chemically converted graphene as electrodes. The performance of GNM-PANI electrode reported herein is far superior to that of most other PANI-based electrodes, demonstrating that {GNM} is a promising scaffold that can help to realize the full potential of {PANI} due to its abundant in-plane nanopores.

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