Cargando…

Atomic scale observation of oxygen delivery during silver–oxygen nanoparticle catalysed oxidation of carbon nanotubes

To probe the nature of metal-catalysed processes and to design better metal-based catalysts, atomic scale understanding of catalytic processes is highly desirable. Here we use aberration-corrected environmental transmission electron microscopy to investigate the atomic scale processes of silver-base...

Descripción completa

Detalles Bibliográficos
Autores principales: Yue, Yonghai, Yuchi, Datong, Guan, Pengfei, Xu, Jia, Guo, Lin, Liu, Jingyue
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4947170/
https://www.ncbi.nlm.nih.gov/pubmed/27406595
http://dx.doi.org/10.1038/ncomms12251
_version_ 1782443124075790336
author Yue, Yonghai
Yuchi, Datong
Guan, Pengfei
Xu, Jia
Guo, Lin
Liu, Jingyue
author_facet Yue, Yonghai
Yuchi, Datong
Guan, Pengfei
Xu, Jia
Guo, Lin
Liu, Jingyue
author_sort Yue, Yonghai
collection PubMed
description To probe the nature of metal-catalysed processes and to design better metal-based catalysts, atomic scale understanding of catalytic processes is highly desirable. Here we use aberration-corrected environmental transmission electron microscopy to investigate the atomic scale processes of silver-based nanoparticles, which catalyse the oxidation of multi-wall carbon nanotubes. A direct semi-quantitative estimate of the oxidized carbon atoms by silver-based nanoparticles is achieved. A mechanism similar to the Mars–van Krevelen process is invoked to explain the catalytic oxidation process. Theoretical calculations, together with the experimental data, suggest that the oxygen molecules dissociate on the surface of silver nanoparticles and diffuse through the silver nanoparticles to reach the silver/carbon interfaces and subsequently oxidize the carbon. The lattice distortion caused by oxygen concentration gradient within the silver nanoparticles provides the direct evidence for oxygen diffusion. Such direct observation of atomic scale dynamics provides an important general methodology for investigations of catalytic processes.
format Online
Article
Text
id pubmed-4947170
institution National Center for Biotechnology Information
language English
publishDate 2016
publisher Nature Publishing Group
record_format MEDLINE/PubMed
spelling pubmed-49471702016-07-27 Atomic scale observation of oxygen delivery during silver–oxygen nanoparticle catalysed oxidation of carbon nanotubes Yue, Yonghai Yuchi, Datong Guan, Pengfei Xu, Jia Guo, Lin Liu, Jingyue Nat Commun Article To probe the nature of metal-catalysed processes and to design better metal-based catalysts, atomic scale understanding of catalytic processes is highly desirable. Here we use aberration-corrected environmental transmission electron microscopy to investigate the atomic scale processes of silver-based nanoparticles, which catalyse the oxidation of multi-wall carbon nanotubes. A direct semi-quantitative estimate of the oxidized carbon atoms by silver-based nanoparticles is achieved. A mechanism similar to the Mars–van Krevelen process is invoked to explain the catalytic oxidation process. Theoretical calculations, together with the experimental data, suggest that the oxygen molecules dissociate on the surface of silver nanoparticles and diffuse through the silver nanoparticles to reach the silver/carbon interfaces and subsequently oxidize the carbon. The lattice distortion caused by oxygen concentration gradient within the silver nanoparticles provides the direct evidence for oxygen diffusion. Such direct observation of atomic scale dynamics provides an important general methodology for investigations of catalytic processes. Nature Publishing Group 2016-07-13 /pmc/articles/PMC4947170/ /pubmed/27406595 http://dx.doi.org/10.1038/ncomms12251 Text en Copyright © 2016, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Yue, Yonghai
Yuchi, Datong
Guan, Pengfei
Xu, Jia
Guo, Lin
Liu, Jingyue
Atomic scale observation of oxygen delivery during silver–oxygen nanoparticle catalysed oxidation of carbon nanotubes
title Atomic scale observation of oxygen delivery during silver–oxygen nanoparticle catalysed oxidation of carbon nanotubes
title_full Atomic scale observation of oxygen delivery during silver–oxygen nanoparticle catalysed oxidation of carbon nanotubes
title_fullStr Atomic scale observation of oxygen delivery during silver–oxygen nanoparticle catalysed oxidation of carbon nanotubes
title_full_unstemmed Atomic scale observation of oxygen delivery during silver–oxygen nanoparticle catalysed oxidation of carbon nanotubes
title_short Atomic scale observation of oxygen delivery during silver–oxygen nanoparticle catalysed oxidation of carbon nanotubes
title_sort atomic scale observation of oxygen delivery during silver–oxygen nanoparticle catalysed oxidation of carbon nanotubes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4947170/
https://www.ncbi.nlm.nih.gov/pubmed/27406595
http://dx.doi.org/10.1038/ncomms12251
work_keys_str_mv AT yueyonghai atomicscaleobservationofoxygendeliveryduringsilveroxygennanoparticlecatalysedoxidationofcarbonnanotubes
AT yuchidatong atomicscaleobservationofoxygendeliveryduringsilveroxygennanoparticlecatalysedoxidationofcarbonnanotubes
AT guanpengfei atomicscaleobservationofoxygendeliveryduringsilveroxygennanoparticlecatalysedoxidationofcarbonnanotubes
AT xujia atomicscaleobservationofoxygendeliveryduringsilveroxygennanoparticlecatalysedoxidationofcarbonnanotubes
AT guolin atomicscaleobservationofoxygendeliveryduringsilveroxygennanoparticlecatalysedoxidationofcarbonnanotubes
AT liujingyue atomicscaleobservationofoxygendeliveryduringsilveroxygennanoparticlecatalysedoxidationofcarbonnanotubes