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- Title
High Temperature Vacuum Annealing and Hydrogenation Modification of Exfoliated Graphite Nanoplatelets.
- Authors
Xiaobing Li; Biswas, Sanjib; Drzal, Lawrence T.
- Abstract
Highly active defect sites on the edges of graphene automatically capture oxygen fromair to formvarious oxygen groups. Atwo-step procedure to remove various oxygen functional groups from the defect sites of exfoliated graphene nanoplatelets (GNPs) has been developed to reduce the atomic oxygen concentration from9.5% to 4.8%. This two-step approach involves high temperature vacuum annealing followed by hydrogenation to protect the reduced edge carbon atoms from recombining with the atmospheric oxygen. The reduced GNPs exhibit decreased surface resistance and graphitic potential-dependent capacitance characteristics compared to the complex potential-dependent capacitance characteristics exhibited by the unreduced GNPs as a result of the removal of the oxygen functional groups present primarily at the edges. These reduced GNPs also exhibit high electrochemical cyclic stability for electrochemical energy storage applications.
- Subjects
HIGH temperatures; VACUUM technology; HYDROGENATION; CHEMICAL peel; GRAPHITE; FUNCTIONAL groups; SURFACE resistance
- Publication
Journal of Engineering (2314-4912), 2013, p1
- ISSN
2314-4904
- Publication type
Article
- DOI
10.1155/2013/638576