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Title: Desorption Kinetics of Methanol, Ethanol, and Water from Graphene

Abstract

The desorption kinetics of methanol, ethanol, and water from graphene covered Pt(111) are investigated. The temperature programmed desorption (TPD) spectra for both methanol and ethanol have well-resolved first, second, third, and multilayer layer desorption peaks. The alignment of the leading edges is consistent with zero-order desorption kinetics from all layers. In contrast, for water the first and second layers are not resolved. At low water coverages (< 1 ML) the initial desorption leading edges are aligned but then fall out of alignment at higher temperatures. For thicker water layers (10 to 100 ML), the desorption leading edges are in alignment throughout the desorption of the film. The coverage dependence of the desorption behavoir suggests that at low water coverages the non-alignment of the desorption leading edges is due to water dewetting from the graphene substrate. Kinetic simulations reveal that the experimental results are consistent with zero-order desorption. The simulations also show that fractional order desorption kinetics would be readily apparent in the experimental TPD spectra.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1168921
Report Number(s):
PNNL-SA-100492
48154; KC0301020
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry A, 118(37):8242-8250
Additional Journal Information:
Journal Name: Journal of Physical Chemistry A, 118(37):8242-8250
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Smith, R. Scott, Matthiesen, Jesper, and Kay, Bruce D. Desorption Kinetics of Methanol, Ethanol, and Water from Graphene. United States: N. p., 2014. Web. doi:10.1021/jp501038z.
Smith, R. Scott, Matthiesen, Jesper, & Kay, Bruce D. Desorption Kinetics of Methanol, Ethanol, and Water from Graphene. United States. doi:10.1021/jp501038z.
Smith, R. Scott, Matthiesen, Jesper, and Kay, Bruce D. Thu . "Desorption Kinetics of Methanol, Ethanol, and Water from Graphene". United States. doi:10.1021/jp501038z.
@article{osti_1168921,
title = {Desorption Kinetics of Methanol, Ethanol, and Water from Graphene},
author = {Smith, R. Scott and Matthiesen, Jesper and Kay, Bruce D.},
abstractNote = {The desorption kinetics of methanol, ethanol, and water from graphene covered Pt(111) are investigated. The temperature programmed desorption (TPD) spectra for both methanol and ethanol have well-resolved first, second, third, and multilayer layer desorption peaks. The alignment of the leading edges is consistent with zero-order desorption kinetics from all layers. In contrast, for water the first and second layers are not resolved. At low water coverages (< 1 ML) the initial desorption leading edges are aligned but then fall out of alignment at higher temperatures. For thicker water layers (10 to 100 ML), the desorption leading edges are in alignment throughout the desorption of the film. The coverage dependence of the desorption behavoir suggests that at low water coverages the non-alignment of the desorption leading edges is due to water dewetting from the graphene substrate. Kinetic simulations reveal that the experimental results are consistent with zero-order desorption. The simulations also show that fractional order desorption kinetics would be readily apparent in the experimental TPD spectra.},
doi = {10.1021/jp501038z},
journal = {Journal of Physical Chemistry A, 118(37):8242-8250},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {9}
}