Anodic TiO2 nanotube layers decorated by Pd nanoparticles using ALD: An efficient electrocatalyst for methanol oxidation

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dc.contributor.authorBawab, Bilalcs
dc.contributor.authorThalluri, Sitaramanjaneya Moulics
dc.contributor.authorRodriguez Pereira, Jhonatancs
dc.contributor.authorSopha, Hanna Ingridcs
dc.contributor.authorZazpe Mendioroz, Raúlcs
dc.contributor.authorMacák, Jancs
dc.coverage.issue1cs
dc.coverage.volume429cs
dc.date.issued2022-10-10cs
dc.description.abstractHerein, we report the performance of Pd nanoparticles (NPs) prepared by Atomic Layer Deposition (ALD) as a catalyst for methanol electro-oxidation. Pd NPs were decorated onto anodic TiO2 nanotube (TNT) layers as supporting material that possess a large available surface area and direct electrical contact via the underlying titanium foil. Different Pd loadings (150 - 300 - 450 - 600 ALD cycles) show different particles sizes ranging between 7 and 12 nm, as revealed by transmission electron microscopy. Coalescence dominated visibly from 450 ALD cycles, which led to a porous Pd layer all along the TNT walls rather than the growth of individual particles. Electrocatalytic performance was investigated by cyclic voltammetry (CV), where the catalytic activity increased proportional with Pd loading up to the highest values for 400 and 450 cycles, whereas a further increase in the number of ALD cycles (N-ALD) did not show any additional improvement in methanol oxidation current densities. TNT layers decorated with 400, 450 and 600 Pd ALD cycles show featureless curves suggesting complete anti-poisoning ability or possibly a proof of a direct conversion from CH3OH to CO2 (without any intermediate byproducts). The lack of an oxidation peak during the anodic scan and therefore a reduction peak during the cathodic scan, confirms Pd NPs (stabilized by TiO2) efficiently utilize OHads and chemisorbed CH3OH in a way that its CO poisoning was inhibited. As a result, the tuned high surface area TNT layers exhibited excellent performance as a supporting material for Pd NPs against formation of electrochemical poisoning species. Finally, the mechanism of the TNT layers interaction with Pd NPs, which led to the propelling methanol oxidation reaction without loss in performance over cycling is postulated.en
dc.formattextcs
dc.format.extent1-11cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationELECTROCHIMICA ACTA. 2022, vol. 429, issue 1, p. 1-11.en
dc.identifier.doi10.1016/j.electacta.2022.141044cs
dc.identifier.issn1873-3859cs
dc.identifier.orcid0000-0001-9556-8536cs
dc.identifier.orcid0000-0001-7091-3022cs
dc.identifier.other179176cs
dc.identifier.researcheridAAD-7864-2021cs
dc.identifier.scopus000195568536cs
dc.identifier.scopus55655855500cs
dc.identifier.urihttp://hdl.handle.net/11012/208675
dc.language.isoencs
dc.publisherElseviercs
dc.relation.ispartofELECTROCHIMICA ACTAcs
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0013468622012014cs
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1873-3859/cs
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/cs
dc.subjectTiO2 nanotube layersen
dc.subjectPd nanoparticlesen
dc.subjectAtomic Layer Depositionen
dc.subjectElectrocatalysisen
dc.subjectMethanol electro-oxidationen
dc.titleAnodic TiO2 nanotube layers decorated by Pd nanoparticles using ALD: An efficient electrocatalyst for methanol oxidationen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-179176en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:51:18en
sync.item.modts2025.01.17 18:39:09en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Pokročilé nízkodimenzionální nanomateriálycs
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