Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 40, Pages 34900-34908Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b09604
Keywords
nitroxide radical polymer; nitroxide radical coupling; pi-pi stacking; reduced graphene oxide; electrochemistry
Funding
- ARC
- Foundation Research Excellent Award (FREA) from the University of Queensland
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Nitroxide radical polymers can undergo both excellent electrochemical redox reactions and a rapid click coupling reaction with carbon-centered radicals (i.e., nitroxide radical coupling (NRC) reaction). In this work, we report a strategy to functionalize poly(2,2,6,6,-tetramethylpiperidinyl-1-oxyl methacrylate) (PTMA) with pyrene side groups through a rapid and near quantitative NRC reaction. This resulted in P(TMA-co-PyMA) random copolymers with near quantitative amounts of pyrene along the PTMA chain for greater pi-pi interaction with rGO, while the nitroxide radicals on the polymer could simultaneously be used for energy storage. These copolymers can bind with reduced graphene oxide (rGO) and form layered composites through noncovalent pi-pi stacking, attaining molecular-level dispersion. Electrochemical performance of the composites with different polymer contents (24, 35, and 45 wt %), tested in lithium ion batteries, indicated that the layered structures consisting of P(TMA-co-PyMA) maintained greater capacities at high C-rates. This simple and efficient strategy to synthesize pyrene-functionalized polymers will provide new opportunities to fabricate many other polymer composite electrodes for desired electrochemical performance.
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