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In Situ Polymerization of Dopamine on Graphene Framework for Charge Storage Applications
Author(s) -
Liu Tianyuan,
Lee Byeongyong,
Kim Byoung Gak,
Lee Michael J.,
Park Jinho,
Lee Seung Woo
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201801236
Subject(s) - graphene , materials science , coating , cathode , electrode , nanotechnology , conformal coating , polymerization , in situ polymerization , oxide , chemical engineering , composite material , polymer , chemistry , engineering , metallurgy
Polydopamine, a functional coating material, is redox active as cathode materials for both Li‐ and Na‐ion batteries or hybrid capacitors. Here, a polydopamine coating onto 3D graphene framework is introduced through a simple hydrothermal process, during which graphene oxide serves not only as an oxidant for assisting the polymerization of dopamine, but also as a template for the conformal growth of polydopamine. High‐density films are fabricated by compressing the polydopamine‐coated graphene aerogels, which can be directly used as free‐standing and flexible cathodes in both Li‐ and Na‐cells. The compact electrodes deliver high capacities of ≈230 mAh g −1 in Li‐cells and ≈211 mAh g −1 in Na‐cells based on the total mass of electrodes. These compact electrodes also exhibit exceptional cycling stability and high rate performance due to the unique structure in which polydopamine is uniformly coated on the 3D structured graphene.