標題: Quantum Chemical Prediction of Reaction Pathways and Rate Constants for the Reactions of O-x (x=1 and 2) with Pristine and Defective Graphite (0001) Surfaces
作者: Xu, S. C.
Chen, Hui-Lung
Lin, M. C.
應用化學系分子科學碩博班
Institute of Molecular science
公開日期: 19-一月-2012
摘要: We present reaction pathways for adsorption reactions of the O atom and O-2 molecule in the pristine and monovacancy defective graphite (0001) based on quantum chemical potential energy surfaces (PESs) obtained by the dispersion-augmented density-functional tight-binding (DFTB-D) method. We use a dicircumcoronene C96H24 (L0D) graphene slab as the pristine graphite (0001) model and dicircumcoronene C95H24 (LIV) as the graphite (0001) monovacancy defect model. We found that the adsorption reactions of O and O-2 on the L0D surface can produce defects on the graphite surface. O can yield CO, while O-2 can yield both CO and CO2 molecules. The adsorption reactions of the O and O-2 on the LW surface can produce a 2-C defective graphite surface and CO, and CO and CO2, respectively. The O and O-2 more readily oxidize the defected surface, LIV, than the defect-free surface, L0D. On the basis of the computed reaction pathways, we predict reaction rate constants in the temperature range between 300 and 3000 K using Rice-Ramsperger-Kassel-Marcus (RRKM) theory. High-temperature quantum chemical molecular dynamics simulations at 3000 K based on on-the-fly DFTB-D energies and gradients support the results of our PES studies.
URI: http://dx.doi.org/10.1021/jp206934r
http://hdl.handle.net/11536/15251
ISSN: 1932-7447
DOI: 10.1021/jp206934r
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 116
Issue: 2
起始頁: 1841
結束頁: 1849
顯示於類別:期刊論文


文件中的檔案:

  1. 000299584800026.pdf