Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 32, Pages 17837-17843Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b04185
Keywords
covalent organic framework anthraquinone; alkaline electrolyte; noncovalent functionalization; graphene; capacitor
Funding
- National Science Foundation of China [21173061, 21373070]
- Open Project of State Key Laboratory of Robotics and System (HIT) [SKLRS-2015-MS-11]
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To harness the electroactivity of anthraquinone as an electrode material, a great recent effort have been invested to composite anthraquinone with carbon materials to improve the conductivity. Here we report on a noncovalent way to modify three-dimensional graphene with anthraquinone moieties through on-surface synthesis of two-dimensional covalent organic frameworks. We incorporate 2,6-diamino-anthraquinone moieties into COP through Schiff-base reaction with benzene-1,3,5-tricarbaldehyde. The synthesized COP -graphene composite exhibits large specific capacitance of 31.7 mF/cm(2). Long-term galvanostatic charge/discharge cycling experiments revealed a decrease of capacitance, which was attributed to the loss of COF materials and electrostatic repulsion accumulated during charge-discharge circles which result in the poor electrical conductivity between 2D COP layers.
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