Real-Time Staircase Cyclic Voltammetry Fourier Transform Electrochemical Impedance Spectroscopic Studies on Underpotential Deposition of Lead on Gold
SCIE
SCOPUS
- Title
- Real-Time Staircase Cyclic Voltammetry Fourier Transform Electrochemical Impedance Spectroscopic Studies on Underpotential Deposition of Lead on Gold
- Authors
- Chang, BY; Ahn, E; Park, SM
- Date Issued
- 2008-10-30
- Publisher
- AMER CHEMICAL SOC
- Abstract
- We report results of detailed studies on the underpotential deposition of lead (Pb UPD) and effects of specifically adsorbed halide anions on the UPD reaction at polycrystalline gold electrodes employing real-time staircase cyclic voltammetry Fourier transform electrochemical impedance spectroscopy (SCV-FTEIS). Potential shifts observed during the Pb UPD in the presence of halide ions are partially attributed to the chemical interaction of halide ions with Pb2+ as well as the physical obstruction by the preadsorbed halide ions. More importantly, the presorbed halides, oil the top of which Pb2+ ions are adsorbed, form it pseudocapacitor on the gold surface, and its electrical discharge leads to the Ph UPD. Real-time SCV-FTEIS measurements in a chloride solution without Pb2+ reveal that the voltammetric currents arise from charging both the double-layer and pseudocapacitors formed due to the presorption of halide ions at the surface, indicating that the capacitors formed upon adsorption of halide ions oil the electrode surface play a critical role in the Pb UPD.
- Keywords
- SINGLE-CRYSTAL SURFACES; SQUARE-WAVE VOLTAMMETRY; THIN-FILM GOLD; KINETIC-PARAMETERS; ADSORPTION; UPD; POLYCRYSTALLINE; ELECTRODE; AU(111); PB
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/22435
- DOI
- 10.1021/JP805960J
- ISSN
- 1932-7447
- Article Type
- Article
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, vol. 112, no. 43, page. 16902 - 16909, 2008-10-30
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.