Show simple item record

AuthorSun Hee, Yoon
AuthorPark, Hyunwoong
AuthorElbashir, Nimir O.
AuthorHan, Dong Suk
Available date2022-12-19T08:27:26Z
Publication Date2020-12
Publication NameSustainable Materials and Technologies
Identifierhttp://dx.doi.org/10.1016/j.susmat.2020.e00224
CitationYoon, S. H., Park, H., Elbashir, N. O., & Han, D. S. (2020). Effect of Fe/N-doped carbon nanotube (CNT) wall thickness on CO2 conversion: A DFT study. Sustainable Materials and Technologies, 26, e00224.
ISSN2214-9937
URIhttps://www.sciencedirect.com/science/article/pii/S2214993720306485
URIhttp://hdl.handle.net/10576/37390
AbstractMany researches on CO2 adsorption using carbon nanotubes (CNTs) have been actively studied, but experimental and theoretical studies on CO2 conversion are still in demand. In particular, the effect of CNT wall thickness on CO2 conversion is not yet established clearly. This study employed two different-walled CNT catalysts doped with iron and nitrogen, single-walled CNT (Fe-N-SWCNT) and double-walled CNT (Fe-N-DWCNT). The structural and electrical properties of these CNTs and their influences on CO2 conversion were characterized and compared using density functional theory (DFT) calculations. As a result, Fe-N-DWCNT was shown to improve catalyst stability with higher formation energy and adsorption energy for CO2 adsorption than Fe-N-SWCNT. Also, the CO2 molecules were found to be highly delocalized and strongly hybridized with Fe-N-DWCNT, leading to more active charge transfer in the catalyst. These findings demonstrate the potential of selective CO2 conversion, as wall thickness differences can lead to different electrical properties of CNTs by showing that the larger the thicknesses, the lower the energy barrier required for CO2 conversion. Specifically, Fe-N-DWCNT is easier to convert CO2 to HCOOH than Fe-N-SWCNT at lower overpotential (0.15 V) obtained with limiting potentials and free energies calculated by understanding the possible reaction pathways in the proton-electron transfer process. Therefore, these results support the hypothesis that the wall thickness of CNT influences CO2 conversion by showing that the double-walled heterogeneous CNT (Fe-N-DWCNT) is a potential catalyst to selectively produce HCOOH from CO2 conversion.
SponsorQatar National Research Fund (QNRF) - grant #NPRP 10-1210-160019.
Languageen
PublisherElsevier
SubjectCarbon nanotube
CO2 conversion
Density functional theory
Wall thickness
Formate
TitleEffect of Fe/N-doped carbon nanotube (CNT) wall thickness on CO2 conversion: A DFT study
TypeArticle
Volume Number26
Open Access user License http://creativecommons.org/licenses/by/4.0/
ESSN2214-9937
dc.accessType Open Access


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record