The study of adsorbed species using electrochemical and ultra high vacuum techniques
The study of adsorbed species using electrochemical and ultra high vacuum techniques
A UHV-electrochemical transfer system has been designed to allow the electrochemical examination of well defined electrode surfaces. The UHV spectroscopic techniques employed were X-ray photoelectron spectroscopy (XPS), thermal desorption spectroscopy (TDS) and low energy electron diffraction (LEED) whilst the electrochemical technique used was cyclic voltammetry. A number of separate UHV and electrochemical studies were also carried out. Electrochemical investigations of the reduction of nitrous oxide at platinum electrodes in acid solution have revealed that strongly bound hydrogen is indeed present on Pt (111). The adsorption of methanol, formaldehyde and formic acid on clean and oxygen dosed Pt (110) has been studied using XPS, TDS and LEED. On clean Pt (110), methanol adsorbed in two states, a monolayer and a multilayer phase. 10% of the adsorbed monolayer decomposed into CO and H2. Reaction of methanol with pre-adsorbed oxygen resulted in the formation of H2O. Formaldehyde also adsorbed in a monolayer and multilayer phase on Pt (110). 50% of the adsorbed monolayer decomposed to give CO and H2. Reaction of formaldehyde with preadsorbed oxygen resulted in the formation of two additional products, CO2 and H2O. Formic acid decomposed to give CO2 and H2 on Pt (110). A number of preliminary electrochemical studies were conducted. Both Bi and Pd were shown to spontaneously adsorb on Pt when it was put in contact with a solution containing these ions. Bi suppressed the adsorption of hydrogen on Pt (111) in acid solution. Adsorbed Pd had no effect on the adsorption of hydrogen on Pt (110) whilst it altered the ratio of strongly bound hydrogen to the more weakly bound on Pt (100). On Pt (111), Pd caused the anomalous spike to shift to a lower potential. A brief study of the adsorption of Cl on Au (100) was carried out to investigate the stability of the (5 x 20) surface reconstruction on exposure to an electrolyte.
University of Southampton
1989
Ebert, Helen Diane
(1989)
The study of adsorbed species using electrochemical and ultra high vacuum techniques.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
A UHV-electrochemical transfer system has been designed to allow the electrochemical examination of well defined electrode surfaces. The UHV spectroscopic techniques employed were X-ray photoelectron spectroscopy (XPS), thermal desorption spectroscopy (TDS) and low energy electron diffraction (LEED) whilst the electrochemical technique used was cyclic voltammetry. A number of separate UHV and electrochemical studies were also carried out. Electrochemical investigations of the reduction of nitrous oxide at platinum electrodes in acid solution have revealed that strongly bound hydrogen is indeed present on Pt (111). The adsorption of methanol, formaldehyde and formic acid on clean and oxygen dosed Pt (110) has been studied using XPS, TDS and LEED. On clean Pt (110), methanol adsorbed in two states, a monolayer and a multilayer phase. 10% of the adsorbed monolayer decomposed into CO and H2. Reaction of methanol with pre-adsorbed oxygen resulted in the formation of H2O. Formaldehyde also adsorbed in a monolayer and multilayer phase on Pt (110). 50% of the adsorbed monolayer decomposed to give CO and H2. Reaction of formaldehyde with preadsorbed oxygen resulted in the formation of two additional products, CO2 and H2O. Formic acid decomposed to give CO2 and H2 on Pt (110). A number of preliminary electrochemical studies were conducted. Both Bi and Pd were shown to spontaneously adsorb on Pt when it was put in contact with a solution containing these ions. Bi suppressed the adsorption of hydrogen on Pt (111) in acid solution. Adsorbed Pd had no effect on the adsorption of hydrogen on Pt (110) whilst it altered the ratio of strongly bound hydrogen to the more weakly bound on Pt (100). On Pt (111), Pd caused the anomalous spike to shift to a lower potential. A brief study of the adsorption of Cl on Au (100) was carried out to investigate the stability of the (5 x 20) surface reconstruction on exposure to an electrolyte.
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Published date: 1989
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Local EPrints ID: 461801
URI: http://eprints.soton.ac.uk/id/eprint/461801
PURE UUID: 14520d31-9b87-408c-ba80-953d9f754a28
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Date deposited: 04 Jul 2022 18:55
Last modified: 04 Jul 2022 18:55
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Author:
Helen Diane Ebert
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