Effect of the Pd/MWCNTs anode catalysts preparation methods on their morphology and activity in a direct formic acid fuel cell

B. Lesiak , Marta Mazurkiewicz-Pawlicka , Artur Małolepszy , Leszek Stobiński , B. Mierzwa , A. Mikolajczuk-Zychora , K. Juchniewicz , A. Borodziński , J. Zemek , P. Jiricek

Abstract

Impact of Pd/MWCNTs catalysts preparation method on the catalysts morphology and activity in a formic acid electrooxidation reaction was investigated. Three reduction methods of Pd precursor involving reduction in a high pressure microwave reactor (Pd1), reduction with NaBH4 (Pd2) and microwave-assisted polyol method (Pd3) were used in this paper. Crystallites size and morphology were studied using the scanning transmission electron microscopy (STEM), X-ray diffraction (XRD), whereas elemental composition, Pd chemical state and functional groups content by the X-ray photoelectron spectroscopy (XPS). The prepared catalysts were tested in a direct formic acid fuel cell (DFAFC) as an anode material. The catalytic activity was correlated with a mean fraction of the total Pd atoms exposed at the surface (FE). The value of FE was calculated from the crystallites size distribution determined by the STEM measurements. Non-linear dependence of a current density versus FE, approaching the maximum at FE≈0.25 suggests that the catalytic process proceeded at Pd nanocrystallites faces, with inactive edges and corners. Pd2 catalyst exhibited highest activity due to its smallest Pd crystallites (3.2 nm), however the absence of Pd crystallites aggregation and low content of carbon in PdCx phase, i.e. x = 4 at.% may also affect the observed.
Author B. Lesiak
B. Lesiak,,
-
, Marta Mazurkiewicz-Pawlicka LG PW
Marta Mazurkiewicz-Pawlicka,,
- WUT Grafen Laboratory
, Artur Małolepszy LG PW
Artur Małolepszy,,
- WUT Grafen Laboratory
, Leszek Stobiński LG PW - [Institute of Physical Chemistry Polish Academy of Sciences (IChF PAN)]
Leszek Stobiński,,
- WUT Grafen Laboratory
- Instytut Chemii Fizycznej Polskiej Akademii Nauk
, B. Mierzwa
B. Mierzwa,,
-
, A. Mikolajczuk-Zychora
A. Mikolajczuk-Zychora,,
-
, K. Juchniewicz
K. Juchniewicz,,
-
, A. Borodziński
A. Borodziński,,
-
, J. Zemek
J. Zemek,,
-
, P. Jiricek
P. Jiricek,,
-
Journal seriesApplied Surface Science, ISSN 0169-4332
Issue year2016
Vol387
Pages929-937
Publication size in sheets0.5
Keywords in Englishelectro-oxidation, DFAFC, Pd/MWCNTs, preparation conditions, reducing agents, microwave conditions
DOIDOI:10.1016/j.apsusc.2016.06.152
URL http://ac.els-cdn.com/S0169433216313812/1-s2.0-S0169433216313812-main.pdf?_tid=414d7912-be0d-11e6-af12-00000aab0f27&acdnat=1481287662_348db91c9a9e4d56dd59a8e8855e700e
Languageen angielski
File
Lesiak B. (i in.) - Effect of the....pdf (file archived - login or check accessibility on faculty) Lesiak B. (i in.) - Effect of the....pdf 1.79 MB
Score (nominal)35
ScoreMinisterial score = 35.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 3.387 (2) - 2016=3.184 (5)
Citation count*0
Cite
Share Share



* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
Back