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Surface redox properties of lanthanu...

Vovk, Gregory.

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Surface redox properties of lanthanum chromium nickel oxide, lanthanum strontium cobalt oxide, and silver explored via in-situ x-ray photoelectron spectroscopy.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Surface redox properties of lanthanum chromium nickel oxide, lanthanum strontium cobalt oxide, and silver explored via in-situ x-ray photoelectron spectroscopy./
Author:	Vovk, Gregory.
Description:	122 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5088.
Contained By:	Dissertation Abstracts International64-10B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ84676
ISBN:	0612846768

Surface redox properties of lanthanum chromium nickel oxide, lanthanum strontium cobalt oxide, and silver explored via in-situ x-ray photoelectron spectroscopy.
Vovk, Gregory.

Surface redox properties of lanthanum chromium nickel oxide, lanthanum strontium cobalt oxide, and silver explored via in-situ x-ray photoelectron spectroscopy. - 122 p.

Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5088.

Thesis (Ph.D.)--University of Toronto (Canada), 2003.

The surface redox properties of LaCr0.6Ni0.4O 3 (powder), La0.5Sr0.5CoO3 (thin film) and silver (powder) were investigated using X-ray photoelectron spectroscopy (XPS). In order to control the oxidation state of a sample in ultra high vacuum (UHV) conditions, it was incorporated as the working electrode in a solid state electrochemical cell with the following configuration: (sample|YSZ|Pd:PdO)), where YSZ is 8 mol% yttria-stabilized zirconia, an oxide ion conducting electrolyte and Pd:PdO is a palladium-palladium oxide powder mixture serving as the reference electrode and an oxygen reservoir. Reduction/oxidation of the sample was initiated by applying an external bias voltage to the sample.

ISBN: 0612846768Subjects--Topical Terms:

1018531
Engineering, Chemical.

Surface redox properties of lanthanum chromium nickel oxide, lanthanum strontium cobalt oxide, and silver explored via in-situ x-ray photoelectron spectroscopy.
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100 1 $a Vovk, Gregory. $3 1952770
245 1 0 $a Surface redox properties of lanthanum chromium nickel oxide, lanthanum strontium cobalt oxide, and silver explored via in-situ x-ray photoelectron spectroscopy.
300 $a 122 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5088.
500 $a Adviser: Charles A. Mims.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2003.
520 $a The surface redox properties of LaCr0.6Ni0.4O 3 (powder), La0.5Sr0.5CoO3 (thin film) and silver (powder) were investigated using X-ray photoelectron spectroscopy (XPS). In order to control the oxidation state of a sample in ultra high vacuum (UHV) conditions, it was incorporated as the working electrode in a solid state electrochemical cell with the following configuration: (sample|YSZ|Pd:PdO)), where YSZ is 8 mol% yttria-stabilized zirconia, an oxide ion conducting electrolyte and Pd:PdO is a palladium-palladium oxide powder mixture serving as the reference electrode and an oxygen reservoir. Reduction/oxidation of the sample was initiated by applying an external bias voltage to the sample.
520 $a It was found that the surface of LaCr0.6Ni0.4O 3 and LaNiO3 powders could be reversibly reduced and oxidized electrochemically to changes involving La, Cr, Ni, and to a lesser extent, O surface atoms. Binding energy shifts (with respect to the La 3d5/2 peak) were seen for the Cr 2p, Ni 3p, and O 1s peaks. The La 3d peaks did not shift noticeably upon reduction, but did exhibit La 3d5/2 parent:satellite ratio changes. The reduced surfaces of LaCr0.6Ni 0.4O3 and LaNiO3 were found to be active in adsorbing CO2, an indication of the increased Lewis basicity of these surfaces upon electrochemical reduction.
520 $a La0.5Sr0.5CoO3 thin films displayed similar La 3d5/2 parent:satellite ratio changes as to those seen on LaCr0.6Ni0.4O3 and LaNiO3. The electronic behavior of the B-cation, Co, showed localized electronic changes. Furthermore, the surface stoichiometry of La0.5Sr0.5CoO 3 was rich in La and Sr and displayed irreversible binding energy changes in the Sr 3d and O 1s XPS signals. Two different species of oxygen and strontium were always present on the La0.5Sr0.5CoO3 surface.
520 $a Ag showed reversible changes to O 1s XPS binding energy shifts and amounts. Although this behavior is in agreement with previous reports, the results were complicated by the reversible movement of sodium arising from a contaminant in the YSZ electrolyte.
590 $a School code: 0779.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Chemistry, Analytical. $3 586156
690 $a 0542
690 $a 0611
690 $a 0486
710 2 0 $a University of Toronto (Canada). $3 1017674
773 0 $t Dissertation Abstracts International $g 64-10B.
790 1 0 $a Mims, Charles A., $e advisor
790 $a 0779
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ84676