Insights into the effect of aluminum oxyhydrates properties on their electrochemical behavior
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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 chemistrySource:
Program and the Book of Abstracts - The nineth Serbian Ceramics Society Conference ''Advanced Ceramics and Application'', Belgrade, 2021, 89-89Publisher:
- Belgrade: Serbian Ceramic Society
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- Belgrade, Serbia, 20-21. September 2021
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IHTMTY - 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 .