English  |  正體中文  |  简体中文  |  Items with full text/Total items : 6480/11652
Visitors : 20122128      Online Users : 188
RC Version 3.2 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search
LoginUploadHelpAboutAdminister

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/16812

Title: Comparison of Voltammetric Behavior of Adsorbed or Dissolved Unsaturated Alcohols at Vacuum-Annealed and Electrochemically Cycled Pt(111) and Pt(polycrystlline) Electrodes
Authors: Nikola Batina;Bruce E. Kahn;Lin, Chiu-Hsun;James W. McCargar;Ghaleb N. Salaita;Arthur T. Hubbard
Contributors: 化學系
Date: 1989-05
Issue Date: 2013-06-05T09:35:44Z
Publisher: John Wiley & Sons, Inc.
Abstract: These studies compare the voltammetric behavior of solutions and adsorbed layers of the following unsaturated alcohols: benzyl alcohol (BZA), 4-pyridylcarbinol (4PC), allyl alcohol (AA), propargyl alcohol (PGA), cis-2-butene-1,4-diol (CBED), and 2-butyne-1,4-diol (BYD). They were undertaken for well-characterized Pt(111) electrode surfaces which were either annealed in an ultrahigh vacuum (UHV) or electrochemically cycled, as well as for annealed (UHV) Pt(poly). Electrochemical oxidation of BZA, AA, PGA, CBED, and BYD in aqueous fluoride electrolyte proceeds in two stages: first the alcohol moiety is oxidized to CO2 (0.4 V), followed by oxidation of the resulting adsorbed hydrocarbon (alkene, alkyne, or phenyl, 1.0 V); 4PC is relatively inert. The alcohol moiety in 4PC, which is located opposite the pyridine ring from the surface, does not undergo oxidation at an appreciable rate. in fact, 4PC effectively passivates the surface and poisons the electrochemical activity. Electrochemical cycling of the annealed Pt(111) single-crystal surface greatly increases the oxidation rates of the aliphatic alcohols and, to a lesser extent, increases the oxidation rate of BZA. The oxidation rate enhancement is somewhat smaller if the electrode is electrochemically cycled in the presence of the alcohol. The majority of the difference effected by cycling can be observed after only one cycle. Voltammetry on polycrystalline Pt surfaces resembles that on cycled Pt(111) surfaces for PGA and AA, but resembles that on cycled Pt(111) surfaces for PGA and AA, but resembles that on annealed Pt(111) more closely for the diols CBED and BYD.
Relation: Electroanalysis, 1(3): 213-221
Appears in Collections:[化學系] 期刊論文

Files in This Item:

File SizeFormat
2020400310001.pdf7KbAdobe PDF502View/Open


All items in NCUEIR are protected by copyright, with all rights reserved.

 


DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback