Effect of Pt Deposits on TiO2Electrocatalytic Activity Highlighted by Electron Tomography

Mariusz Andrzejczuk , Agata Roguska , Marcin Pisarek , P. Kędzierzawski , Małgorzata Lewandowska

Abstract

Characterizing materials at small scales presents major challenges in the engineering of nanocomposite materials having a high specific surface area. Here, we show the application of electron tomography to describe the three-dimensional structure of highly ordered TiO2 nanotube arrays modified with Pt nanoparticles. The titanium oxide nanotubes were prepared by the electrochemical anodization of a Ti substrate after which Pt was deposited by magnetron sputtering. Such a composite shows high electrochemical activity that depends on the amount of the metal and the morphological parameters of the microstructure. However, a TiO2 structure modified with metallic nanoparticles has never been visualized in 3D, making it very difficult to understand the relationship between electrocatalytic activity and morphology. In this paper, TiO2 nanotubes of different sizes and different amounts of Pt were analyzed using the electron microscopy technique. Electrocatalytic activity was studied using the cyclic voltammetry (CV) method. For selected samples, electron tomography 3D structure reconstruction was performed to describe their fine microstructure. The highest activity was detected in the sample having bigger nanotubes (25 V) where the porosity of the structure was high and the Pt content was 0.1 mg cm−2. 3D imaging using electron tomography opens up new possibilities in the design of electrocatalytic materials.
Author Mariusz Andrzejczuk (FMSE / DMD)
Mariusz Andrzejczuk,,
- Division of Materials Design
, Agata Roguska - Institute of Physical Chemistry Polish Academy of Sciences (IChF PAN) [Polska Akademia Nauk (PAN)]
Agata Roguska,,
-
, Marcin Pisarek - Institute of Physical Chemistry Polish Academy of Sciences (IChF PAN) [Polska Akademia Nauk (PAN)]
Marcin Pisarek,,
-
, P. Kędzierzawski
P. Kędzierzawski,,
-
, Małgorzata Lewandowska (FMSE / DMD)
Małgorzata Lewandowska,,
- Division of Materials Design
Journal seriesACS Applied Materials & Interfaces, ISSN 1944-8244, (A 40 pkt)
Issue year2019
Vol11
No20
Pages18841-18848
Publication size in sheets0.5
Keywords in Englishelectron tomography, nanotubes, TiO2, Pt nanoparticles, thin films, scanning transmission electron microscopy
ASJC Classification2500 General Materials Science
DOIDOI:10.1021/acsami.9b03932
URL https://pubs.acs.org/doi/10.1021/acsami.9b03932
Languageen angielski
File
2019 ACS Applied Mater and Interfaces Andrzejczuk.pdf 10.15 MB
Score (nominal)40
ScoreMinisterial score = 40.0, 07-06-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.528; WoS Impact Factor: 2017 = 8.097 (2) - 2017=8.284 (5)
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