Publication detail

Electro- and Photoelectrochemistry on TiO2-based Nanorod Arrays via Anodizing Al/Ti and Al/TiNx Layers

LEDNICKÝ, T. MOZALEV, A. BENDOVÁ, M.

Original Title

Electro- and Photoelectrochemistry on TiO2-based Nanorod Arrays via Anodizing Al/Ti and Al/TiNx Layers

Type

abstract

Language

English

Original Abstract

Nowadays, many research efforts are dedicated to developing advanced materials for photoelectrochemical (PEC) splitting of water into oxygen and hydrogen. One of the materials investigated widely for this application is titanium dioxide. TiO2 in the form of nanowire or nanorod arrays may lead to a substantial increase in the PEC activity compared with that of flat films due to the decoupling of the relatively long light penetration depth from the relatively short minority carrier pathway. On the other hand, critically small nanostructures may become in the flat-band condition, having no depletion layer necessary for effective charge carrier separation. Thus, an adjusted ratio of the nanorod size and its doping concentration leading to a depletion layer of an optimum thickness, occupying a big portion of the nanorod itself, may lead to charge separation taking place in a substantial portion of the nanorod volume, which is expected to increase the PEC response [1]. In this work, we report on the investigation of various types of crystallinity, oxygen vacancy concentration, and nitrogen doping level in the TiO2-based nanorod arrays prepared via porous-anodic-alumina (PAA)-assisted anodization of Ti and TiNx films in order to adjust the depletion layer thickness to take up substantial volume of the nanorods. To evaluate semiconductive properties of the nanostructures, we perform electrochemical impedance spectroscopy (EIS) measurements at various potentials in the dark on differently fabricated and modified TiO2 nanostructures. Also we correlate the properties of differently prepared TiO2 nanoarrays with the preliminary results of their PEC water splitting performance.

Keywords

anodic oxidation, nanorods, nanocolumns, titania, doping, photoelectrochemistry

Authors

LEDNICKÝ, T.; MOZALEV, A.; BENDOVÁ, M.

Released

23. 4. 2017

Publisher

International Society of Electrochemistry

Pages count

1

BibTex

@misc{BUT144027,
  author="Tomáš {Lednický} and Alexander {Mozalev} and Mária {Bendová}",
  title="Electro- and Photoelectrochemistry on TiO2-based Nanorod Arrays via Anodizing Al/Ti and Al/TiNx Layers",
  booktitle="21st Topical Meeting of the International Society of Electrochemistry; Photoelectrochemistry of semiconductors at the nanoscale: from fundamental aspects to practical applications",
  year="2017",
  pages="1",
  publisher="International Society of Electrochemistry",
  note="abstract"
}