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Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts

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2010
rSE_SEE_13_proc.pdf (2.110Mb)
Authors
Lović, Jelena
Tripković, Amalija
Popović, Ksenija
Conference object (Published version)
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Abstract
Activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (~25 %) and RuUPD (~40 %) in overall oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD. To establish the activity and stability of the catalysts potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD or RuUPD modified Pt/C catalysts. Electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts are less active than corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD modified Pt/C than between Pt3Ru2/C and RuUPD modified Pt/C is caused by electronic effect in Pt3Sn/C. High activity of Pt3Sn/C modified with small amount of SnUPD (~10%...) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of SnUPD, with enhanced amount of oxygen-containing species on Sn sites resulting finally in reinforcement of bifunctional mechanism.

Keywords:
Ethanol oxidation / Pt-based alloys / Catalysts
Source:
Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings, 2010, 207-210
Publisher:
  • Serbian Chemical Society, Belgrade
Note:
  • Belgrade, Serbia, June 6-10, 2010
  • Related to the http://cer.ihtm.bg.ac.rs/handle/123456789/3532

ISBN: 978-86-7132-044-3

[ Google Scholar ]
Handle
https://hdl.handle.net/21.15107/rcub_cer_3533
URI
http://www.aseee.eu/index.php/rsesee2-home
https://cer.ihtm.bg.ac.rs/handle/123456789/3533
Collections
  • Radovi istraživača / Researchers' publications
Institution/Community
IHTM
TY  - CONF
AU  - Lović, Jelena
AU  - Tripković, Amalija
AU  - Popović, Ksenija
PY  - 2010
UR  - http://www.aseee.eu/index.php/rsesee2-home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3533
AB  - Activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (~25 %) and RuUPD (~40 %) in overall oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD. To establish the activity and stability of the catalysts potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD or RuUPD modified Pt/C catalysts. Electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts are less active than corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD modified Pt/C than between Pt3Ru2/C and RuUPD modified Pt/C is caused by electronic effect in Pt3Sn/C. High activity of Pt3Sn/C modified with small amount of SnUPD (~10%) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of SnUPD, with enhanced amount of oxygen-containing species on Sn sites resulting finally in reinforcement of bifunctional mechanism.
PB  - Serbian Chemical Society, Belgrade
C3  - Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
T1  - Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts
SP  - 207
EP  - 210
UR  - https://hdl.handle.net/21.15107/rcub_cer_3533
ER  - 
@conference{
author = "Lović, Jelena and Tripković, Amalija and Popović, Ksenija",
year = "2010",
abstract = "Activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (~25 %) and RuUPD (~40 %) in overall oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD. To establish the activity and stability of the catalysts potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD or RuUPD modified Pt/C catalysts. Electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts are less active than corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD modified Pt/C than between Pt3Ru2/C and RuUPD modified Pt/C is caused by electronic effect in Pt3Sn/C. High activity of Pt3Sn/C modified with small amount of SnUPD (~10%) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of SnUPD, with enhanced amount of oxygen-containing species on Sn sites resulting finally in reinforcement of bifunctional mechanism.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings",
title = "Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts",
pages = "207-210",
url = "https://hdl.handle.net/21.15107/rcub_cer_3533"
}
Lović, J., Tripković, A.,& Popović, K.. (2010). Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
Serbian Chemical Society, Belgrade., 207-210.
https://hdl.handle.net/21.15107/rcub_cer_3533
Lović J, Tripković A, Popović K. Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings. 2010;:207-210.
https://hdl.handle.net/21.15107/rcub_cer_3533 .
Lović, Jelena, Tripković, Amalija, Popović, Ksenija, "Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts" in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings (2010):207-210,
https://hdl.handle.net/21.15107/rcub_cer_3533 .

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