Electrocatalytic activity of Au nanoparticles onto TiO2 nanotubular layers in oxygen electroreduction reaction: size and support effects
authors Maltanava, H; Poznyak, S; Starykevich, M; Ivanovskaya, M
nationality International
journal ELECTROCHIMICA ACTA
author keywords Electrocatalysis; Titanium dioxide; Nanotubes; Gold nanoparticles; Schottky barrier
keywords ANODIC OXIDE-FILMS; SCHOTTKY-BARRIER FORMATION; GOLD NANOPARTICLES; CATALYTIC-ACTIVITY; TITANIUM-DIOXIDE; PASSIVE FILMS; CO OXIDATION; AC-IMPEDANCE; GROWTH-RATE; REDUCTION
abstract Electrocatalytic activity of both bare high-ordered TiO2 nanotubes (TNTs) and gold nanoparticles (Au NPs) loaded TNTs toward oxygen reduction reaction (ORR) has been examined by cyclic voltammetry (CV). Cyclic voltammograms for Au NPs-TNT electrodes are characterized by an additional wave observed at less negative potentials which is responsible for oxygen electroreduction on the surface of gold NPs. The overpotential for O-2 reduction on the Au surface grows with increasing the temperature of TNT annealing and the Au NPs size. The nature of the effects observed was explained by peculiarities of the electron transport through Schottky barrier formed at the Au NPs - TiO2 interface. The width of the Schottky barrier, determined by semiconductor doping level and Au NPs size, plays a key role in the mechanism of electron transport through the space charge region. (C) 2016 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2016
volume 222
beginning page 1013
ending page 1020
digital object identifier (doi) 10.1016/j.electacta.2016.11.070
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000395443700007
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 6.215
5 year journal impact factor 5.478
category normalized journal impact factor percentile 83.333
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg