Surface electrochemical studies of Pd thin films electrodeposited at Pt electrode surfaces /
The interfacial structure, composition and chemical reactivity of clean and halide-pretreated Pd thin films on Pt(111) electrode surfaces have been investigated. Pd deposition on Pt(111) was carried out electrochemically up to coverages equivalent to 4 manslayers (ML). I-catalyzed Pd dissolution was...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1999.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=733673821&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The interfacial structure, composition and chemical reactivity of clean and halide-pretreated Pd thin films on Pt(111) electrode surfaces have been investigated. Pd deposition on Pt(111) was carried out electrochemically up to coverages equivalent to 4 manslayers (ML). I-catalyzed Pd dissolution was used to determine the amount of Pd deposited. Pd thin films were ordered and exhibited (1x1) diffraction patterns indicating epitaxial growth when deposited from sulfate-free solutions. At Pd coverages [] 2 ML, chemisorbed exhibited either a Pt(111)-(1x1)- Pd-(3x3)-I or a mixed (3x3) and ([]3x[]3) pattern. At Pd coverages > 2 ML, only a Pt(111)-(1x1)-Pd-([]3x[]3)-I structure, identical to that on bulk Pt(111), was indicated. Quantitative anodic oxidation of Pd occurs in the presence of I[] leaving a Pt(111)-(3x3)-I or mixed Pt(111)-(3x3)-I and Pt(111)-([]7x[]7)-I adlattice. Br[] leads to digital etching of the Pd film, whereas bulk Br⁻ results in a one step complete anodic stripping of Pd from Pt(111). Competitive chemisorption and displacement reactions between the halogen on the surface and halide in solution indicate the strength of chemisorption is the same as that seen for bulk Pd and decreases as I ̊> Br.̊ |
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| Item Description: | Vita. "Major Subject: Chemistry". |
| Physical Description: | xv, 137 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 132-136). |