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In situ structural study of underpot...

Chen, Chun-hsien.

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In situ structural study of underpotential deposition and electrocatalysis on gold(111) electrodes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	In situ structural study of underpotential deposition and electrocatalysis on gold(111) electrodes./
Author:	Chen, Chun-hsien.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1993,
Description:	153 p.
Notes:	Source: Dissertations Abstracts International, Volume: 55-04, Section: B.
Contained By:	Dissertations Abstracts International55-04B.
Subject:	Chemistry. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9328994

In situ structural study of underpotential deposition and electrocatalysis on gold(111) electrodes.
Chen, Chun-hsien.

In situ structural study of underpotential deposition and electrocatalysis on gold(111) electrodes. - Ann Arbor : ProQuest Dissertations & Theses, 1993 - 153 p.

Source: Dissertations Abstracts International, Volume: 55-04, Section: B.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1993.

This item must not be sold to any third party vendors.

This thesis work has studied systems of Bi, Pb, Ag, and Hg underpotential deposition (UPD) on Au(111) electrodes. The application of the atomic force microscope (AFM), the scanning tunneling microscope (STM), and the surface x-ray scattering (SXS) to these UPD studies has provided in situ measurements from which we investigate factors that determine UPD surface structures and correlate these structures with surface reactivity. For all the UPD systems in this thesis work, atomic level features of the electrode surface have been revealed. In the case of Pb UPD, Pb starts to deposit by forming islands which exhibit a hexagonal close packed structure of Pb adatoms, while, in the other systems, the UPD adatoms form open lattices. In the Bi and Pb studies, we correlate the activities of the modified surface toward electroreduction of $\\rm H\\sb2O\\sb2$ with the adlattice structures. A heterobimetallic bridge model for $\\rm H\\sb2O\\sb2$ on the surface could explain the enhanced reactivity. The full monolayers of Bi and Hg, rhombohedral metals, form rectangular lattice structures on the hexagonal Au(111) surfaces. The partial charge retention on the Bi and Hg adatom opens the adlayer structure when the coverage is less than a full monolayer. The structure of the first submonolayers of Ag UPD is electrolyte-dependent. The electrode surface exhibits 3 x 3 and 4 x 4 overlayer structures in solutions containing sulfate and nitrate, respectively. In perchloric acid another open structure is observed and a close-packed monolayer is formed in acetic acid. The different monolayer structures give rise to packing densities which correlate with electrolyte size. This implies that the anions participate in reducing metal ions.Subjects--Topical Terms:

516420
Chemistry.
Subjects--Index Terms:

gold electrode

In situ structural study of underpotential deposition and electrocatalysis on gold(111) electrodes.
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100 1 $a Chen, Chun-hsien. $3 3561268
245 1 0 $a In situ structural study of underpotential deposition and electrocatalysis on gold(111) electrodes.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1993
300 $a 153 p.
500 $a Source: Dissertations Abstracts International, Volume: 55-04, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Gewirth, A. A.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1993.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a This thesis work has studied systems of Bi, Pb, Ag, and Hg underpotential deposition (UPD) on Au(111) electrodes. The application of the atomic force microscope (AFM), the scanning tunneling microscope (STM), and the surface x-ray scattering (SXS) to these UPD studies has provided in situ measurements from which we investigate factors that determine UPD surface structures and correlate these structures with surface reactivity. For all the UPD systems in this thesis work, atomic level features of the electrode surface have been revealed. In the case of Pb UPD, Pb starts to deposit by forming islands which exhibit a hexagonal close packed structure of Pb adatoms, while, in the other systems, the UPD adatoms form open lattices. In the Bi and Pb studies, we correlate the activities of the modified surface toward electroreduction of $\\rm H\\sb2O\\sb2$ with the adlattice structures. A heterobimetallic bridge model for $\\rm H\\sb2O\\sb2$ on the surface could explain the enhanced reactivity. The full monolayers of Bi and Hg, rhombohedral metals, form rectangular lattice structures on the hexagonal Au(111) surfaces. The partial charge retention on the Bi and Hg adatom opens the adlayer structure when the coverage is less than a full monolayer. The structure of the first submonolayers of Ag UPD is electrolyte-dependent. The electrode surface exhibits 3 x 3 and 4 x 4 overlayer structures in solutions containing sulfate and nitrate, respectively. In perchloric acid another open structure is observed and a close-packed monolayer is formed in acetic acid. The different monolayer structures give rise to packing densities which correlate with electrolyte size. This implies that the anions participate in reducing metal ions.
590 $a School code: 0090.
650 4 $a Chemistry. $3 516420
650 4 $a Condensation. $3 942542
650 4 $a Analytical chemistry. $3 3168300
653 $a gold electrode
690 $a 0494
690 $a 0611
690 $a 0486
710 2 $a University of Illinois at Urbana-Champaign. $3 626646
773 0 $t Dissertations Abstracts International $g 55-04B.
790 $a 0090
791 $a Ph.D.
792 $a 1993
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9328994