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Electrodeposited AgPd alloy coatings as efficient catalysts for the ethanol oxidation reaction

Authorized Users Only
2018
Authors
Lović, Jelena
Elezović, Nevenka R.
Jovic, B. M.
Zabinski, Piotr
Gajić Krstajić, Ljiljana
Jović, Vladimir D.
Article (Published version)
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Abstract
The Pd and three AgPd alloy layers (AgPd1, AgPd2 and AgPd3) were electrodeposited onto Au disc electrodes from the solution containing high concentration of chloride ions (>12 M). All coatings were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), anodic linear sweep voltammetry (ALSV), while their surface composition was investigated by X-ray photoelectron spectroscopy (XPS). The AgPd1 and AgPd2 samples were electrodeposited at different constant current densities (-0.178 mA cm(-2) and -0.415 mA cm(-2) respectively) to the charge of -0.2 C cm(-2) (thickness similar to 0.18 mu m) at a stationary disc electrode, while the sample AgPd3 was electrodeposited to the charge of -3.0 C cm(-2) (thickness similar to 2.8 mu m) at a constant current density of -7.0 mA cm(-2) under the conditions of convective diffusion. Samples AgPd1 and AgPd2 had similar morphologies of low roughness, while the morphology of AgPd3 was characterized by large crystals a...nd higher roughness. The most active and the most poisoning tolerant coatings for ethanol oxidation reaction (EOR) are the AgPd3 and AgPd1 alloy samples, containing 72.6 at.% Ag - 27.4 at.% Pd and 84.7 at.% Ag - 15.2 at.% Pd respectively (XPS analysis). In this study, we demonstrated for the first time that the activity for the EOR at AgPd alloys was closely related to the amount of non-reduced Ag2O (most probably as Ag - hydroxide). Accordingly, all AgPd alloy samples had to be cycled in the potential region of Ag2O formation and reduction before the investigation of the EOR, in order to provide their catalytic activity towards the EOR.

Keywords:
Electrodeposition / AgPd coatings / Ethanol oxidation / Non-reduced Ag2O
Source:
International Journal of Hydrogen Energy, 2018, 43, 39, 18498-18508
Publisher:
  • Oxford : Pergamon-Elsevier Science Ltd
Funding / projects:
  • Development, characterization and application nanostructured and composite electrocatalysts and interactive supports for fuel cells and water electrolysis (RS-172054)
  • New approach in designing materials for energy conversion and energy storage systems (RS-172060)
  • COST MP1407 action for networking

DOI: 10.1016/j.ijhydene.2018.08.056

ISSN: 0360-3199

WoS: 000446949400043

Scopus: 2-s2.0-85052806947
[ Google Scholar ]
9
8
URI
https://cer.ihtm.bg.ac.rs/handle/123456789/2373
Collections
  • Radovi istraživača / Researchers' publications
Institution/Community
IHTM
TY  - JOUR
AU  - Lović, Jelena
AU  - Elezović, Nevenka R.
AU  - Jovic, B. M.
AU  - Zabinski, Piotr
AU  - Gajić Krstajić, Ljiljana
AU  - Jović, Vladimir D.
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2373
AB  - The Pd and three AgPd alloy layers (AgPd1, AgPd2 and AgPd3) were electrodeposited onto Au disc electrodes from the solution containing high concentration of chloride ions (>12 M). All coatings were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), anodic linear sweep voltammetry (ALSV), while their surface composition was investigated by X-ray photoelectron spectroscopy (XPS). The AgPd1 and AgPd2 samples were electrodeposited at different constant current densities (-0.178 mA cm(-2) and -0.415 mA cm(-2) respectively) to the charge of -0.2 C cm(-2) (thickness similar to 0.18 mu m) at a stationary disc electrode, while the sample AgPd3 was electrodeposited to the charge of -3.0 C cm(-2) (thickness similar to 2.8 mu m) at a constant current density of -7.0 mA cm(-2) under the conditions of convective diffusion. Samples AgPd1 and AgPd2 had similar morphologies of low roughness, while the morphology of AgPd3 was characterized by large crystals and higher roughness. The most active and the most poisoning tolerant coatings for ethanol oxidation reaction (EOR) are the AgPd3 and AgPd1 alloy samples, containing 72.6 at.% Ag - 27.4 at.% Pd and 84.7 at.% Ag - 15.2 at.% Pd respectively (XPS analysis). In this study, we demonstrated for the first time that the activity for the EOR at AgPd alloys was closely related to the amount of non-reduced Ag2O (most probably as Ag - hydroxide). Accordingly, all AgPd alloy samples had to be cycled in the potential region of Ag2O formation and reduction before the investigation of the EOR, in order to provide their catalytic activity towards the EOR.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - International Journal of Hydrogen Energy
T1  - Electrodeposited AgPd alloy coatings as efficient catalysts for the ethanol oxidation reaction
VL  - 43
IS  - 39
SP  - 18498
EP  - 18508
DO  - 10.1016/j.ijhydene.2018.08.056
UR  - Conv_4003
ER  - 
@article{
author = "Lović, Jelena and Elezović, Nevenka R. and Jovic, B. M. and Zabinski, Piotr and Gajić Krstajić, Ljiljana and Jović, Vladimir D.",
year = "2018",
abstract = "The Pd and three AgPd alloy layers (AgPd1, AgPd2 and AgPd3) were electrodeposited onto Au disc electrodes from the solution containing high concentration of chloride ions (>12 M). All coatings were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), anodic linear sweep voltammetry (ALSV), while their surface composition was investigated by X-ray photoelectron spectroscopy (XPS). The AgPd1 and AgPd2 samples were electrodeposited at different constant current densities (-0.178 mA cm(-2) and -0.415 mA cm(-2) respectively) to the charge of -0.2 C cm(-2) (thickness similar to 0.18 mu m) at a stationary disc electrode, while the sample AgPd3 was electrodeposited to the charge of -3.0 C cm(-2) (thickness similar to 2.8 mu m) at a constant current density of -7.0 mA cm(-2) under the conditions of convective diffusion. Samples AgPd1 and AgPd2 had similar morphologies of low roughness, while the morphology of AgPd3 was characterized by large crystals and higher roughness. The most active and the most poisoning tolerant coatings for ethanol oxidation reaction (EOR) are the AgPd3 and AgPd1 alloy samples, containing 72.6 at.% Ag - 27.4 at.% Pd and 84.7 at.% Ag - 15.2 at.% Pd respectively (XPS analysis). In this study, we demonstrated for the first time that the activity for the EOR at AgPd alloys was closely related to the amount of non-reduced Ag2O (most probably as Ag - hydroxide). Accordingly, all AgPd alloy samples had to be cycled in the potential region of Ag2O formation and reduction before the investigation of the EOR, in order to provide their catalytic activity towards the EOR.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "International Journal of Hydrogen Energy",
title = "Electrodeposited AgPd alloy coatings as efficient catalysts for the ethanol oxidation reaction",
volume = "43",
number = "39",
pages = "18498-18508",
doi = "10.1016/j.ijhydene.2018.08.056",
url = "Conv_4003"
}
Lović, J., Elezović, N. R., Jovic, B. M., Zabinski, P., Gajić Krstajić, L.,& Jović, V. D.. (2018). Electrodeposited AgPd alloy coatings as efficient catalysts for the ethanol oxidation reaction. in International Journal of Hydrogen Energy
Oxford : Pergamon-Elsevier Science Ltd., 43(39), 18498-18508.
https://doi.org/10.1016/j.ijhydene.2018.08.056
Conv_4003
Lović J, Elezović NR, Jovic BM, Zabinski P, Gajić Krstajić L, Jović VD. Electrodeposited AgPd alloy coatings as efficient catalysts for the ethanol oxidation reaction. in International Journal of Hydrogen Energy. 2018;43(39):18498-18508.
doi:10.1016/j.ijhydene.2018.08.056
Conv_4003 .
Lović, Jelena, Elezović, Nevenka R., Jovic, B. M., Zabinski, Piotr, Gajić Krstajić, Ljiljana, Jović, Vladimir D., "Electrodeposited AgPd alloy coatings as efficient catalysts for the ethanol oxidation reaction" in International Journal of Hydrogen Energy, 43, no. 39 (2018):18498-18508,
https://doi.org/10.1016/j.ijhydene.2018.08.056 .,
Conv_4003 .

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