dc.creator | Lačnjevac, Uroš | |
dc.creator | Radmilović, Vuk | |
dc.creator | Radmilović, Velimir R. | |
dc.creator | Krstajić, Nedeljko V. | |
dc.date.accessioned | 2021-03-10T12:44:33Z | |
dc.date.available | 2021-03-10T12:44:33Z | |
dc.date.issued | 2015 | |
dc.identifier.issn | 0013-4686 | |
dc.identifier.uri | http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2981 | |
dc.description.abstract | Nanocomposite cathodes for the hydrogen evolution reaction (HER) were prepared by deposition of RuOx catalyst particles on self-organized titania nanotube (TiNT) arrays of highly developed surface area, following a procedure that involved the initial cathodic intercalation of H+ into the TiNT walls and the subsequent two-step ion-exchange process. Transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS) analyses of obtained Ru-TiNT samples revealed that the concentration of RuOx particles in the size range of a few nanometers was the highest at the surface of the TiNT layer and steadily decreased to a minimum value at about 4.5 mu m inside the tubes. The capacitive behavior and electrocatalytic activity for the HER of Ru-TiNT nanocomposites, hydrogenated TiNT samples (H-TiNT) and compact TiO2 were investigated in 1.0 M HClO4 solution at room temperature by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Mott-Schottky analysis and steady-state polarization measurements. It was shown that cathodic hydrogenation treatment induced a four orders of magnitude higher concentration of electron donors in TiNT structures providing their quasimetallic behavior in the range of potentials corresponding to the HER. Ru-TiNT cathodes exhibited a more than 250 mV lower overpotential for the HER with respect to bare H-TiNT substrates at the current density of -50 mA cm (2). A decrease of the Tafel slope from about -120 mV/dec for H-TiNT samples to as low as -70 mV/dec for the Ru-TiNT sample with longer tubes was explained by the formal kinetics approach. | en |
dc.publisher | Pergamon-Elsevier Science Ltd, Oxford | |
dc.relation | info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172054/RS// | |
dc.relation | DFG research training group GRK 1896 at Erlangen University | |
dc.rights | restrictedAccess | |
dc.source | Electrochimica Acta | |
dc.subject | hydrogen evolution reaction | en |
dc.subject | anodized TiO2 nanotube arrays | en |
dc.subject | RuOx nanocatalyst | en |
dc.subject | semiconductor electrodes | en |
dc.subject | electrochemical impedance spectroscopy | en |
dc.title | RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution | en |
dc.type | article | |
dc.rights.license | ARR | |
dc.citation.epage | 190 | |
dc.citation.other | 168: 178-190 | |
dc.citation.rank | M21 | |
dc.citation.spage | 178 | |
dc.citation.volume | 168 | |
dc.identifier.doi | 10.1016/j.electacta.2015.04.012 | |
dc.identifier.scopus | 2-s2.0-84926662771 | |
dc.identifier.wos | 000354055500024 | |
dc.type.version | publishedVersion | |