The interfacial chemistry of halides and pseudo-halides on Pd(111) single crystal electrodes : studies by UHV-EC /
The interfacial structure, composition and electrochemical reactivity of halides [Br' and Cl'] and pseudo-halides [HS'] chemistries from aqueous solutions at well-defined Pd(111) electrode surfaces have been investigated. C1' and Br' chemisorb oxidatively to form well-ordere...
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1998.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=732834031&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The interfacial structure, composition and electrochemical reactivity of halides [Br' and Cl'] and pseudo-halides [HS'] chemistries from aqueous solutions at well-defined Pd(111) electrode surfaces have been investigated. C1' and Br' chemisorb oxidatively to form well-ordered zero-valent adlattices: [Pd(111)-(V3xV3)R30O-Cl and Pd(111)-(V3xV3)R30O-Br]. Competitive chemisorption and displacement reactions between the halogens indicate the strength of adsorption decrease as [1' > Br' > Cl']. The acids [HZSO: or TFA] used to impart solution pH had an effect on the adsorption. [H2SO4] competes with the halides for adsorption sites while TFA does not significantly interact. Disulfide chemistries oxidatively to form a well-ordered zero-valent [Pd(111)-(V7xk7)R19O-S]. Thermal treatment of sulfur multipliers also formed well-ordered structures: a [Pd(111)-(V7x$7)R19O-S and Pd(111)-(1x1)-S] alloy. These well-ordered structures were susceptible to anodic oxidation, while sulfur multilayer was not. The unique anodic oxidation of sulfur multilayer appears to arise from the formation of an ultra-thin polymeric sulfur film. |
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| Item Description: | Vita. "Major Subject: Chemistry". |
| Physical Description: | xi, 114 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references: pages 107-113. |