The effect of oxidative functionalization of carbon nanotubes on the morphological, optical, and photoelectrochemical properties of modified titanium dioxide photoanodes

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dc.contributor.authorPeon-Diaz, Francisco J.
dc.contributor.authorSegura del Rio, Rodrigo
dc.contributor.authorHevia, Samuel
dc.contributor.authorOlivares, Fernanda
dc.contributor.authorCarlos Exposito-Galvez, Juan
dc.contributor.authorEscalante, Renan
dc.contributor.authorValadez-Villalobos, Karen
dc.contributor.authorRiquelme, Antonio J.
dc.contributor.authorOskam, Gerko
dc.contributor.authorHenriquez, Ricardo
dc.date.accessioned2025-01-20T20:16:17Z
dc.date.available2025-01-20T20:16:17Z
dc.date.issued2023
dc.description.abstractIn this work, we demonstrate the influence of the oxidative treatment of carbon nanotubes (CNTs) on the morphological, optical, and photoelectrochemical properties of CNTs-TiO2 photoanodes. CNTs were synthesized by a chemical vapor deposition method (CVD) and subsequently oxidized in a mixture of HNO3/H2SO4 to introduce nitrogen- and oxygen-containing functional groups. The oxidation time was varied (45, 90, and 180 min) to obtain CNTs with different oxidation levels (CNTs-ox). Pristine and oxidized CNTs were deposited on ITO and used as substrates to fabricate ITO/CNTs/TiO2 photoelectrodes by depositing a TiO2 thin layer using a CVD procedure. The extent of oxidation of the CNTs was found to directly influence the homogeneity and morphology of the TiO2 overlayer, its physical stability, and the optical and photoelectrochemical properties of the photoelectrodes. An optimum oxidative treatment was achieved for 90 min, leading to a CNTs-ox/TiO2 electrode with the best performance. Compared to shorter and longer times, this sample showed the smallest bandgap and the best homogeneity of TiO2 growth on the CNTs' surface. Optimal photoelectrochemical performance was also found for this sample (160 mu A/cm(2) at 0 V vs. Ag/AgCl) in KCl (0.1 M) electrolyte (100 mW/cm(2), Xenon arc lamp).
dc.fuente.origenWOS
dc.identifier.doi10.1007/s10853-023-08351-4
dc.identifier.eissn1573-4803
dc.identifier.issn0022-2461
dc.identifier.urihttps://doi.org/10.1007/s10853-023-08351-4
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/92319
dc.identifier.wosidWOS:000952928800005
dc.issue.numero12
dc.language.isoen
dc.pagina.final5388
dc.pagina.inicio5372
dc.revistaJournal of materials science
dc.rightsacceso restringido
dc.titleThe effect of oxidative functionalization of carbon nanotubes on the morphological, optical, and photoelectrochemical properties of modified titanium dioxide photoanodes
dc.typeartículo
dc.volumen58
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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