|
Title
|
Probing reaction pathways for oxidation of CO by O2 molecule over P-doped divacancy graphene: A DFT study
|
|
Type
|
JournalPaper
|
|
Keywords
|
CO oxidation; graphene; DFT; adsorption; mechanism
|
|
Abstract
|
Using the dispersion-corrected density functional theory calculations, the catalytic performance of P-doped graphene with divacancy (P-GDV) is examined for the oxidation of CO by O2 molecule. According to our results, the first step of CO oxidation (CO + O2 → CO2 + O*) proceeds via Langmuir–Hinshelwood mechanism with a small activation energy (0.28 eV). The remaining O atom (O*) is then eliminated by another incoming CO molecule with an energy barrier of 0.59 eV. It is found that the orbital hybridization between the O2-2π and CO-2π* states in the coadsorbed structure plays an important role for the first step of the CO oxidation. Our result indicates that the low-cost P-GDV can be regarded as an active metal-free catalyst for CO oxidation at room temperature.
|
|
Researchers
|
Parisa Mousavian (Second Researcher), Mehdi D. Esrafili (First Researcher)
|