RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution
Само за регистроване кориснике
2015
Чланак у часопису (Објављена верзија)

Метаподаци
Приказ свих података о документуАпстракт
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.
Кључне речи:
semiconductor electrodes / RuOx nanocatalyst / hydrogen evolution reaction / electrochemical impedance spectroscopy / anodized TiO2 nanotube arraysИзвор:
Electrochimica Acta, 2015, 168, 178-190Издавач:
- Pergamon-Elsevier Science Ltd, Oxford
Финансирање / пројекти:
- Развој, карактеризација и примена наноструктуираних композитних катализатора и интерактивних носача у горивним спреговима и електролизи воде (RS-172054)
- DFG research training group GRK 1896 at Erlangen University
DOI: 10.1016/j.electacta.2015.04.012
ISSN: 0013-4686
WoS: 000354055500024
Scopus: 2-s2.0-84926662771
Институција/група
Institut za multidisciplinarna istraživanjaTY - JOUR AU - Lačnjevac, Uroš AU - Radmilović, Vuk V. AU - Radmilović, Velimir R AU - Krstajić, Nedeljko V PY - 2015 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/879 AB - 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. PB - Pergamon-Elsevier Science Ltd, Oxford T2 - Electrochimica Acta T1 - RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution EP - 190 SP - 178 VL - 168 DO - 10.1016/j.electacta.2015.04.012 ER -
@article{ author = "Lačnjevac, Uroš and Radmilović, Vuk V. and Radmilović, Velimir R and Krstajić, Nedeljko V", year = "2015", 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.", publisher = "Pergamon-Elsevier Science Ltd, Oxford", journal = "Electrochimica Acta", title = "RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution", pages = "190-178", volume = "168", doi = "10.1016/j.electacta.2015.04.012" }
Lačnjevac, U., Radmilović, V. V., Radmilović, V. R.,& Krstajić, N. V.. (2015). RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution. in Electrochimica Acta Pergamon-Elsevier Science Ltd, Oxford., 168, 178-190. https://doi.org/10.1016/j.electacta.2015.04.012
Lačnjevac U, Radmilović VV, Radmilović VR, Krstajić NV. RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution. in Electrochimica Acta. 2015;168:178-190. doi:10.1016/j.electacta.2015.04.012 .
Lačnjevac, Uroš, Radmilović, Vuk V., Radmilović, Velimir R, Krstajić, Nedeljko V, "RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution" in Electrochimica Acta, 168 (2015):178-190, https://doi.org/10.1016/j.electacta.2015.04.012 . .