Please use this identifier to cite or link to this item: https://physrep.ff.bg.ac.rs/handle/123456789/1340
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dc.contributor.authorKrstajić Pajić, Mila Nen_US
dc.contributor.authorDobrota, Ana Sen_US
dc.contributor.authorMazare, Ancaen_US
dc.contributor.authorĐurđić, Slađanaen_US
dc.contributor.authorHwang, Imgonen_US
dc.contributor.authorSkorodumova, Natalia Ven_US
dc.contributor.authorManojlović, Draganen_US
dc.contributor.authorVasilić, Rastkoen_US
dc.contributor.authorPašti, Igor Aen_US
dc.contributor.authorSchmuki, Patriken_US
dc.contributor.authorLačnjevac, Urošen_US
dc.date.accessioned2023-10-02T14:36:27Z-
dc.date.available2023-10-02T14:36:27Z-
dc.date.issued2023-07-05-
dc.identifier.issn19448244-
dc.identifier.urihttps://physrep.ff.bg.ac.rs/handle/123456789/1340-
dc.description.abstractEfficient cathodes for the hydrogen evolution reaction (HER) in acidic water electrolysis rely on the use of expensive platinum group metals (PGMs). However, to achieve economically viable operation, both the content of PGMs must be reduced and their intrinsically strong H adsorption mitigated. Herein, we show that the surface effects of hydrogenated TiO2 nanotube (TNT) arrays can make osmium, a so far less-explored PGM, a highly active HER electrocatalyst. These defect-rich TiO2 nanostructures provide an interactive scaffold for the galvanic deposition of Os particles with modulated adsorption properties. Through systematic investigations, we identify the synthesis conditions (OsCl3 concentration/temperature/reaction time) that yield a progressive improvement in Os deposition rate and mass loading, thereby decreasing the HER overpotential. At the same time, the Os particles deposited by this procedure remain mainly sub-nanometric and entirely cover the inner tube walls. An optimally balanced Os@TNT composite prepared at 3 mM/55 °C/30 min exhibits a record low overpotential (η) of 61 mV at a current density of 100 mA cm-2, a high mass activity of 20.8 A mgOs-1 at 80 mV, and a stable performance in an acidic medium. Density functional theory calculations indicate the existence of strong interactions between the hydrogenated TiO2 surface and small Os clusters, which may weaken the Os-H* binding strength and thus boost the intrinsic HER activity of Os centers. The results presented in this study offer new directions for the fabrication of cost-effective PGM-based catalysts and a better understanding of the synergistic electronic interactions at the PGM|TiO2 interface.en_US
dc.language.isoenen_US
dc.relation.ispartofACS applied materials & interfacesen_US
dc.subjectdensity functional theoryen_US
dc.subjectgalvanic depositionen_US
dc.subjectmass activityen_US
dc.subjectmetal-support interactionsen_US
dc.subjectplatinum group metalsen_US
dc.titleActivation of Osmium by the Surface Effects of Hydrogenated TiO2 Nanotube Arrays for Enhanced Hydrogen Evolution Reaction Performanceen_US
dc.typeJournal Articleen_US
dc.identifier.doi10.1021/acsami.3c04498-
dc.identifier.pmid37341465-
dc.identifier.scopus2-s2.0-85164244774-
dc.identifier.urlhttps://api.elsevier.com/content/abstract/scopus_id/85164244774-
dc.relation.issue26en_US
dc.relation.volume15en_US
dc.relation.firstpage31459en_US
dc.relation.lastpage31469en_US
item.grantfulltextnone-
item.languageiso639-1en-
item.openairetypeJournal Article-
item.cerifentitytypePublications-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextNo Fulltext-
crisitem.author.orcid0000-0003-2476-7516-
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