4.8 Article

Controllable Tailoring Graphene Nanoribbons with Tunable Surface Functionalities: An Effective Strategy toward High-Performance Lithium-Ion Batteries

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 31, Pages 17441-17449

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b04864

Keywords

graphene nanoribbon; unzipping oxygen-functional groups; anode; lithium ion battery

Funding

  1. National Natural Science Foundation of China (NSFC) [51408085, 51402344]
  2. Ministry of Science and Technology of Taiwan (MOST) [NSC 102-2218-E-011-022-MY2]
  3. National Taiwan University of Science and Technology (NTUST)

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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 Xray 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(-1) 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(-1). 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.

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