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

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• 作者：Chundong Wang ; Yan-Sheng Li ; Jianjun Jiang ; Wei-Hung Chiang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：7
• 期：31
• 页码：17441-17449
• 全文大小：544K
• ISSN：1944-8252

文摘

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^鈥? 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^鈥?. 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.