TiO2 nanotubes with pt and pd nanoparticles as catalysts for electro-oxidation of formic acid

Marcin Pisarek , Piotr Kędzierzawski , Mariusz Andrzejczuk , Marcin Hołdyński , Anna Mikołajczuk-Zychora , Andrzej Borodziński , Maria Janik-Czachor

Abstract

In the present work, the magnetron sputtering technique was used to prepare new catalysts of formic acid electrooxidation based on TiO2 nanotubes decorated with Pt (platinum), Pd (palladium) or Pd + Pt nanoparticles. TiO2 nanotubes (TiO2 NTs) with strictly defined geometry were produced by anodization of Ti foil and Ti mesh in a mixture of glycerol and water with ammonium fluoride electrolyte. The above mentioned catalytically active metal nanoparticles (NPs) were located mainly on the top of the TiO2 NTs, forming 'rings' and agglomerates. A part of metal nanoparticles decorated also TiO2 NTs walls, thus providing sufficient electronic conductivity for electron transportation between the metal nanoparticle rings and Ti current collector. The electrocatalytic activity of the TiO2 NTs/Ti foil, decorated by Pt, Pd and/or Pd + Pt NPs was investigated by cyclic voltammetry (CV) and new Pd/TiO2 NTs/Ti mesh catalyst was additionally tested in a direct formic acid fuel cell (DFAFC). The results so obtained were compared with commercial catalyst-Pd/Vulcan. CV tests have shown for carbon supported catalysts, that the activity of TiO2 NTs decorated with Pd was considerably higher than that one decorated with Pt. Moreover, for TiO2 NTs supported Pd catalyst specific activity (per mg of metal) was higher than that for well dispersed carbon supported commercial catalyst. The tests at DFAFC have revealed also that the maximum of specific power for 0.2 Pd/TiO2 catalyst was 70% higher than that of the commercial one, Pd/Vulcan. Morphological features, and/or peculiarities, as well as surface composition of the resulting catalysts have been studied by scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), and chemical surface analytical methods (X-ray photoelectron spectroscopy-XPS; Auger electron spectroscopy-AES).

Author Marcin Pisarek - Institute of Physical Chemistry Polish Academy of Sciences (IChF PAN) [Polish Academy of Sciences (PAN)]
Marcin Pisarek,,
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, Piotr Kędzierzawski - Institute of Physical Chemistry Polish Academy of Sciences (IChF PAN) [Polish Academy of Sciences (PAN)]
Piotr Kędzierzawski,,
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, Mariusz Andrzejczuk (FMSE / DMD)
Mariusz Andrzejczuk,,
- Division of Materials Design
, Marcin Hołdyński - Institute of Physical Chemistry Polish Academy of Sciences (IChF PAN) [Polish Academy of Sciences (PAN)]
Marcin Hołdyński,,
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, Anna Mikołajczuk-Zychora - Institute of Physical Chemistry Polish Academy of Sciences (IChF PAN) [Polish Academy of Sciences (PAN)]
Anna Mikołajczuk-Zychora,,
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, Andrzej Borodziński - Institute of Physical Chemistry Polish Academy of Sciences (IChF PAN) [Polish Academy of Sciences (PAN)]
Andrzej Borodziński,,
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, Maria Janik-Czachor - Institute of Physical Chemistry Polish Academy of Sciences (IChF PAN) [Polish Academy of Sciences (PAN)]
Maria Janik-Czachor,,
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Journal seriesMaterials, ISSN 1996-1944
Issue year2020
Vol13
Pages1-17
Publication size in sheets0.8
Keywords in EnglishTiO2 nanotubes; Pt and Pd nanoparticles; surface and structure characterization; electrocatalysis; formic acid fuel cell
ASJC Classification2500 General Materials Science
DOIDOI:10.3390/ma13051195
URL https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7085067/
Languageen angielski
File
TiO2_Nanotubes_with_Pt_and_Pd_Nanoparticles_as_Cat.pdf 6.75 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 22-07-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.285; WoS Impact Factor: 2018 = 2.972 (2) - 2018=3.532 (5)
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