National Changhua University of Education Institutional Repository : Item 987654321/16816

English | 正體中文 | 简体中文 | Items with full text/Total items : 6507/11669
Visitors : 29894115 Online Users : 265

RC Version 3.2 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.

Scope Adv. Search

Login ‧ Upload ‧ Help ‧ About ‧ Administer

NCUEIR > College of Science > Department of Chemistry > Periodical Articles > Item 987654321/16816

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/16816

Title:	Studies of Adsorbed Unsaturated Alcohols at Well-Defined Pt (111) Electrode Surface by Cyclic Voltammetry Assisted by Vibrational Spectroscopy (EELS)
Authors:	Gui, John Y.;Kahn, Bruce E.;Lin, Chiu-Hsun;Lu, Frank;Ghaleb N. Salaita;Stem, Donald A.;Donald C. Zapien;Arthur T. Hubbard
Contributors:	化學系
Date:	1989-10
Issue Date:	2013-06-05T09:35:59Z
Publisher:	Elsevier
Abstract:	Surface vibrational states (electron energy-loss spectroscopy, EELS), molecular packing density (Auger spectroscopy) and adsorbed layer electrochemical reactivity (cyclic voltammetry) were investigated for the following unsaturated alcohols adsorbed from neat liquids and aqueous solutions at Pt (111): benzyl alcohol (BZA); 4-pyridylcarbinol (4PDC); 3-pyridylcarbinol (3PDC); allyl alcohol (AAL); propargyl alcohol (PGA); cis-2-butene-1,4-diol (CBED); and 2-butyne-1,4-diol (BYD). Chemisorption of the unsaturated centers of these alcohols is the principal mode of surface attachment (phenyl, pyridyl, CC or CC). Electrochemical oxidation of adsorbed BZA, AAL. PGA, CBED and BYD in aqueous fluoride electrolyte proceeds efficiently to CO2, while adsorbed 4PDC and 3PDC are relatively inert. The adsorbed layer of each of these alcohols is stable in vacuum, such that surface spectroscopic methods in vacuum are directly applicable to the liquid/solid interfacial chemistry and electrochemistry of these compounds. 4PDC and 3PDC are adsorbed in a tilted vertical orientation with an angle near 70° between the pyridine ring and the Pt surface. The C-C bond-order for PGA and BYD is reduced dramatically to near that of a double bond as a result of the adsorption process. The aromatic or alkene moieties of BZA, 4PDC, 3PDC, AAL and CBED are retained and only small shifts in their vibrational frequencies are found. Ordered layers of these adsorbed alcohols were not found by LEED, although uniform molecular orientation is suggested by the packing density data and voltammetric behavior.
Relation:	Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 252(1): 169-188
Appears in Collections:	[Department of Chemistry] Periodical Articles

Files in This Item:

File	Size	Format
index.html	0Kb	HTML	608	View/Open

Loading...