Adsorbed-iodine-catalyzed surface reactions of Pd single-crystal electrodes : studies by UHV-EC and EC-STM /
The influence of various interfacial parameters on the
| Main Author: | |
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=742745441&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The influence of various interfacial parameters on the structure, composition and electrochemical reactivity of iodine-coated Pd electrode surfaces has been investigated by a combination of electrochemistry, scanning tunneling microscopy and ultra-high vacuum surface spectroscopy techniques. I-chemisorbs oxidatively to form highly ordered zerovalent adlattices: Pd(100)-(2x2)-I, Pd(100)-c(2x2)-I, Pd(lll)-([]3x[]3)-l and (5x[]3)-l on the Pd(lll) The surface coverages increase as the electrode potential is made more positive, The oxidative chemisorption induces in situ reordering of disordered Pd single crystals. Application of oxidation potenitals to an I-coated Pd single crystal in halide-free acidic solution results in the anodic dissolution of Pd instead of the oxidative desorption of iodine (although at much more positive potentials, oxidative removal of the iodine occurs). The anodic dissolution of Pd occurs layer- by-layer without disruption of the structure or composition of the iodine adlattices. The in situ STM images taken during the dissolution indicated that, at low anodic currents, the Pd dissolution occurs selectively at the step edges. |
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| Item Description: | Vita. "Major Subject: Chemistry". |
| Physical Description: | xiii, 156 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |