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Title: Understanding Defect-Stabilized Noncovalent Functionalization of Graphene

Journal Article · · Advanced Materials Interfaces
 [1];  [1];  [2];  [3];  [2];  [3];  [4];  [4];  [1]
  1. Chemical Science and Engineering Division, Argonne National Laboratory, Argonne IL 60439 USA
  2. Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge TN 37831 USA
  3. Department of Chemical Engineering and Department of Chemistry, University of Virginia, Charlottesville VA 22904 USA
  4. Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, Drexel University, Philadelphia PA 19104 USA

The noncovalent functionalization of graphene by small molecule aromatic adsorbates, phenanthrenequinone (PQ), is investigated systematically by combining electrochemical characterization, high-resolution interfacial X-ray scattering, and ab initio density functional theory calculations. The findings in this study reveal that while PQ deposited on pristine graphene is unstable to electrochemical cycling, the prior introduction of defects and oxygen functionality (hydroxyl and epoxide groups) to the basal plane by exposure to atomic radicals (i.e., oxygen plasma) effectively stabilizes its noncovalent functionalization by PQ adsorption. The structure of adsorbed PQ molecules resembles the graphene layer stacking and is further stabilized by hydrogen bonding with terminal hydroxyl groups that form at defect sites within the graphene basal plane. The stabilized PQ/graphene interface demonstrates persistent redox activity associated with proton-coupled-electron-transfer reactions. The resultant PQ adsorbed structure is essentially independent of electrochemical potentials. These results highlight a facile approach to enhance functionalities of the otherwise chemically inert graphene using noncovalent interactions.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science - Energy Frontier Research Center - Fluid Interface Reactions, Structures and Transport (FIRST)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1392421
Journal Information:
Advanced Materials Interfaces, Vol. 2, Issue 17; ISSN 2196-7350
Publisher:
Wiley-VCH
Country of Publication:
United States
Language:
English

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Cited By (3)

Pseudocapacitance and excellent cyclability of 2,5-dimethoxy-1,4-benzoquinone on graphene journal January 2016
A Review of Supercapacitors Based on Graphene and Redox-Active Organic Materials journal February 2019
Two- and three-dimensional graphene-based hybrid composites for advanced energy storage and conversion devices journal January 2018

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