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Insights into the effect of aluminum oxyhydrates properties on their electrochemical behavior

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2021
bitstream_20885.pdf (449.3Kb)
Authors
Novaković, Tanja
Milovanović, Biljana
Pavlović, Stefan
Banković, Predrag
Mojović, Zorica
Conference object (Published version)
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Abstract
Alumina oxyhydrates have different structural and textural properties, as well as different density of surface functional groups. Three alumina oxyhydrates with different water content, 3mol H2O/ mol Al2O3 (gibbsite), 1mol H2O/ mol Al2O3 (boehmite) and 0.6 mol H2O/ mol Al2O3 (α,γ-alumina phase), were used in this study. The samples were used as modifiers of carbon paste electrode. Their electrochemical behavior toward ferricyanide/ferrocyanide redox probe was evaluated by electrochemical impedance spectroscopy and cyclic voltammetry. Ferricyanide/ferrocyanide redox system has a well-known electrochemical behavior and is sensitive to the changes occurring at the electrode surface. The lowest charge transfer resistance was obtained for α,γ-alumina phase. The redox process of ferri/ferro redox probe on investigated electrodes exhibited a quasi-reversible behavior, since the obtained values of peak-to-peak separation are greater than 59 mV value expected for a reversible process. The re...sponse toward quinone/hydroquinone redox probe was evaluated by cyclic voltammetry in buffered solutions at various pH. Gibbsite and boehmite showed expected response, while the surface groups of α,γ-alumina phase enabled quinone oxidation to proceed through two pathways simultaneously. The surface chemistry of investigated samples influenced their electrochemical properties.

Keywords:
Alumina oxyhydrates / Electrochemistry / ferri/ferro redox probe / surface chemistry
Source:
Program and the Book of Abstracts - The nineth Serbian Ceramics Society Conference ''Advanced Ceramics and Application'', Belgrade, 2021, 89-89
Publisher:
  • Belgrade: Serbian Ceramic Society
Note:
  • Belgrade, Serbia, 20-21. September 2021

ISBN: 978-86-915627-8-6

[ Google Scholar ]
Handle
https://hdl.handle.net/21.15107/rcub_cer_4781
URI
https://cer.ihtm.bg.ac.rs/handle/123456789/4781
Collections
  • Radovi istraživača / Researchers' publications
Institution/Community
IHTM
TY  - CONF
AU  - Novaković, Tanja
AU  - Milovanović, Biljana
AU  - Pavlović, Stefan
AU  - Banković, Predrag
AU  - Mojović, Zorica
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4781
AB  - Alumina oxyhydrates have different structural and textural properties, as well as different density of surface functional groups. Three alumina oxyhydrates with different water content, 3mol H2O/ mol Al2O3 (gibbsite), 1mol H2O/ mol Al2O3 (boehmite) and 0.6 mol H2O/ mol Al2O3 (α,γ-alumina phase), were used in this study. The samples were used as modifiers of carbon paste electrode. Their electrochemical behavior toward ferricyanide/ferrocyanide redox probe was evaluated by electrochemical impedance spectroscopy and cyclic voltammetry. 
 Ferricyanide/ferrocyanide redox system has a well-known electrochemical behavior and is sensitive to the changes occurring at the electrode surface. The lowest charge transfer resistance was obtained for α,γ-alumina phase. The redox process of ferri/ferro redox probe on investigated electrodes exhibited a quasi-reversible behavior, since the obtained values of peak-to-peak separation are greater than 59 mV value expected for a reversible process. The response toward quinone/hydroquinone redox probe was evaluated by cyclic voltammetry in buffered solutions at various pH. Gibbsite and boehmite showed expected response, while the surface groups of α,γ-alumina phase enabled quinone oxidation to proceed through two pathways simultaneously. The surface chemistry of investigated samples influenced their electrochemical properties.
PB  - Belgrade: Serbian Ceramic Society
C3  - Program and the Book of Abstracts - The nineth Serbian Ceramics Society Conference ''Advanced Ceramics and Application'', Belgrade
T1  - Insights into the effect of aluminum oxyhydrates properties on their electrochemical behavior
SP  - 89
EP  - 89
UR  - https://hdl.handle.net/21.15107/rcub_cer_4781
ER  - 
@conference{
author = "Novaković, Tanja and Milovanović, Biljana and Pavlović, Stefan and Banković, Predrag and Mojović, Zorica",
year = "2021",
abstract = "Alumina oxyhydrates have different structural and textural properties, as well as different density of surface functional groups. Three alumina oxyhydrates with different water content, 3mol H2O/ mol Al2O3 (gibbsite), 1mol H2O/ mol Al2O3 (boehmite) and 0.6 mol H2O/ mol Al2O3 (α,γ-alumina phase), were used in this study. The samples were used as modifiers of carbon paste electrode. Their electrochemical behavior toward ferricyanide/ferrocyanide redox probe was evaluated by electrochemical impedance spectroscopy and cyclic voltammetry. 
 Ferricyanide/ferrocyanide redox system has a well-known electrochemical behavior and is sensitive to the changes occurring at the electrode surface. The lowest charge transfer resistance was obtained for α,γ-alumina phase. The redox process of ferri/ferro redox probe on investigated electrodes exhibited a quasi-reversible behavior, since the obtained values of peak-to-peak separation are greater than 59 mV value expected for a reversible process. The response toward quinone/hydroquinone redox probe was evaluated by cyclic voltammetry in buffered solutions at various pH. Gibbsite and boehmite showed expected response, while the surface groups of α,γ-alumina phase enabled quinone oxidation to proceed through two pathways simultaneously. The surface chemistry of investigated samples influenced their electrochemical properties.",
publisher = "Belgrade: Serbian Ceramic Society",
journal = "Program and the Book of Abstracts - The nineth Serbian Ceramics Society Conference ''Advanced Ceramics and Application'', Belgrade",
title = "Insights into the effect of aluminum oxyhydrates properties on their electrochemical behavior",
pages = "89-89",
url = "https://hdl.handle.net/21.15107/rcub_cer_4781"
}
Novaković, T., Milovanović, B., Pavlović, S., Banković, P.,& Mojović, Z.. (2021). Insights into the effect of aluminum oxyhydrates properties on their electrochemical behavior. in Program and the Book of Abstracts - The nineth Serbian Ceramics Society Conference ''Advanced Ceramics and Application'', Belgrade
Belgrade: Serbian Ceramic Society., 89-89.
https://hdl.handle.net/21.15107/rcub_cer_4781
Novaković T, Milovanović B, Pavlović S, Banković P, Mojović Z. Insights into the effect of aluminum oxyhydrates properties on their electrochemical behavior. in Program and the Book of Abstracts - The nineth Serbian Ceramics Society Conference ''Advanced Ceramics and Application'', Belgrade. 2021;:89-89.
https://hdl.handle.net/21.15107/rcub_cer_4781 .
Novaković, Tanja, Milovanović, Biljana, Pavlović, Stefan, Banković, Predrag, Mojović, Zorica, "Insights into the effect of aluminum oxyhydrates properties on their electrochemical behavior" in Program and the Book of Abstracts - The nineth Serbian Ceramics Society Conference ''Advanced Ceramics and Application'', Belgrade (2021):89-89,
https://hdl.handle.net/21.15107/rcub_cer_4781 .

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