| AVS 59th Annual International Symposium and Exhibition | |
| Graphene and Related Materials Focus Topic | Thursday Sessions |
| Session GR+AS+NS+SS-ThM |
| Session: | Graphene Nanostructures |
| Presenter: | R.A. Quinlan, Naval Surface Warfare Center, Carderock Division |
| Authors: | R.A. Quinlan, Naval Surface Warfare Center, Carderock Division M. Cai, The College of William and Mary A.N. Mansour, Naval Surface Warfare Center, Cardercock Division R.A. Outlaw, The College of William and Mary |
| Correspondent: | Click to Email |
Previously reported efforts have identified the potential of vertically oriented graphene nanosheets in electrochemical double-layer capacitors (Miller et. al, Science 2010) for efficient AC line-filtering performance. Continued investigations to improve performance suggest that the availability of a high edge and surface defect density could be the dominant mechanism. Furthermore, charge/discharge profiles over time show that performance can actually increase as the device ages. In an effort to understand these findings, X-ray photoelectron spectroscopy, Auger electron spectroscopy and near edge absorption fine structure spectroscopy have been utilized to study the interaction of the electrolytes and solvents with the graphene-based electrode materials. The EDL capacitance of graphene nanosheets has been measured before and after Ar plasma bombardment for various times and after exposure to water, isopropanol, methanol, NaOH and KOH. Graphene nanosheet electrochemical capacitors have been disassembled and analyzed following short term and long term operation.