Electrodeposition of Cu and Cu-Pd alloys from aqueous and liquid crystal media and their activity for nitrate reduction
Electrodeposition of Cu and Cu-Pd alloys from aqueous and liquid crystal media and their activity for nitrate reduction
This thesis describes the preparation and characterisation of palladium, copper and copper-palladium alloy films for nitrate and nitrite electroreduction. Palladium, copper and copper-palladium films were prepared by electroreduction of the respective salt precursors within the aqueous domain of the hexagonal (H1) lyotropic liquid crystalline phase of C16EO8. These materials were characterised structurally and electrochemically. Mesoporous palladium films were electrodeposited onto platinum microdisc electrodes and the voltammetry of these high area films was studied predominantly in basic media (2 M NaOH). Interestingly features that usually are not possible to observe and to study with smooth palladium films were revealed and the palladium films also showed particular good activity for nitrite electroreduction.
Different templating baths and experimental conditions were studied for the electrodeposition of mesoporous copper films and all the attempts are discussed in detail. Electrochemical methods for the quantification of high area copper films are also discussed. The response for nitrate reduction at copper films electrodeposited in the presence of surfactant is compared with the response obtained at polished Cu discs and Cu films deposited in situ from CuSO4 and a significantly positive shift in the potential can be observed for the former Cu films.
Several aqueous Cu(II)-Pd(II) solutions containing different ratios of the two metal precursors were electrochemical studied and a series of interesting results showing the formation of Cu-Pd alloys is presented. It is also shown in this work that Pd(II) catalyses the electrodeposition of Cu(II) when both cations are present in solution. A number of Cu-Pd films were electrodeposited form aqueous Cu(II)-Pd(II) solutions and it was found by EDX analysis that the films composition strongly depends on the Cu(II):Pd(II) ratio and the deposition potential. The electrodeposition of Cu-Pd films in the presence of C16EO8 introduces even more variables in the system, but smooth and well adherent film with an uniform composition can be obtained.
University of Southampton
Milhano, Clélia Alexandre Claudino
6f5b475b-04ed-48ff-9287-d20ab85aa861
2007
Milhano, Clélia Alexandre Claudino
6f5b475b-04ed-48ff-9287-d20ab85aa861
Milhano, Clélia Alexandre Claudino
(2007)
Electrodeposition of Cu and Cu-Pd alloys from aqueous and liquid crystal media and their activity for nitrate reduction.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This thesis describes the preparation and characterisation of palladium, copper and copper-palladium alloy films for nitrate and nitrite electroreduction. Palladium, copper and copper-palladium films were prepared by electroreduction of the respective salt precursors within the aqueous domain of the hexagonal (H1) lyotropic liquid crystalline phase of C16EO8. These materials were characterised structurally and electrochemically. Mesoporous palladium films were electrodeposited onto platinum microdisc electrodes and the voltammetry of these high area films was studied predominantly in basic media (2 M NaOH). Interestingly features that usually are not possible to observe and to study with smooth palladium films were revealed and the palladium films also showed particular good activity for nitrite electroreduction.
Different templating baths and experimental conditions were studied for the electrodeposition of mesoporous copper films and all the attempts are discussed in detail. Electrochemical methods for the quantification of high area copper films are also discussed. The response for nitrate reduction at copper films electrodeposited in the presence of surfactant is compared with the response obtained at polished Cu discs and Cu films deposited in situ from CuSO4 and a significantly positive shift in the potential can be observed for the former Cu films.
Several aqueous Cu(II)-Pd(II) solutions containing different ratios of the two metal precursors were electrochemical studied and a series of interesting results showing the formation of Cu-Pd alloys is presented. It is also shown in this work that Pd(II) catalyses the electrodeposition of Cu(II) when both cations are present in solution. A number of Cu-Pd films were electrodeposited form aqueous Cu(II)-Pd(II) solutions and it was found by EDX analysis that the films composition strongly depends on the Cu(II):Pd(II) ratio and the deposition potential. The electrodeposition of Cu-Pd films in the presence of C16EO8 introduces even more variables in the system, but smooth and well adherent film with an uniform composition can be obtained.
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Published date: 2007
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Local EPrints ID: 466176
URI: http://eprints.soton.ac.uk/id/eprint/466176
PURE UUID: 4a88b9f6-822e-468c-91be-522b39a8e01e
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Date deposited: 05 Jul 2022 04:38
Last modified: 16 Mar 2024 20:33
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Author:
Clélia Alexandre Claudino Milhano
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