Controllable
Tailoring Graphene Nanoribbons with Tunable Surface Functionalities:
An Effective Strategy toward High-Performance Lithium-Ion Batteries
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Abstract
An effective, large-scale synthesis
strategy for producing graphene nanoribbons (GNRs) with a nearly 100%
yield has been proposed using a stepwise, solution-based, lengthwise
unzipping carbon nanotube (CNT) method. Detailed Raman and X-ray photoelectron
spectroscopy (XPS) analysis suggest that GNRs with tunable density
of oxygen-containing functional groups on the GNR surfaces can be
synthesized by adjusting the oxidant concentration during the CNT
unzipping. The electrochemical characterization reveals that the as-produced
GNRs with 42.91 atomic percent (atom %) oxygen-containing functional
groups deliver a capacity of 437 mAh g<sup>β1</sup> after 100
cycles at 0.33C, while the as-produced GNRs with higher oxygen-containing
functional groups only present a capacity of 225 mAh g<sup>β1</sup>. On the basis of the electrochemical assessment and XPS analysis,
the funtionals groups (epoxy-, carbonyl-, and carboxyl groups) in
GNRs could be the effective contributor for the high-performance Li-ion
batteries with appropriate adjustment