Alternating Current Measurements in Scanning Electrochemical Microscopy, Part 2: Detection of Adsorbates

被引：19
作者：
Dao Trinh [1 ]
Keddam, Michel [1 ]
Ramon Novoa, Xose [2 ]
Vivier, Vincent [1 ]
机构：
[1] Univ Paris 06, LISE UPR CNRS 15, F-75252 Paris 05, France
[2] Univ Vigo, ENCOMAT Grp, ETSEI, Vigo 36310, Spain
来源：
CHEMPHYSCHEM | 2011年 / 12卷 / 11期
关键词：
adsorption; electrochemistry; hydrogen; scanning electrochemical microscopy; scanning probe microscopy; HYDROGEN EVOLUTION REACTION; OVERPOTENTIAL-DEPOSITED H; SINGLE-CRYSTAL ELECTRODES; IMPEDANCE SPECTROSCOPY; ADSORPTION-ISOTHERMS; AC-RESPONSE; SURFACE; H-2; PLATINUM; KINETICS;
D O I：
10.1002/cphc.201001085
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A scanning electrochemical microscope (SECM) in ac mode is used for the characterisation of the adsorption process during the hydrogen evolution reaction (HER) in sulfuric acid solution. It is shown that this technique allows quantitative analysis of the adsorption process, and measurements of the differential capacitance with the frequency as parameter are obtained. The time constant for relaxation of adsorbed hydrogen (H-ads) is approximately 2 Hz, and analysis of the Nyquist plot allows direct evaluation of the charge involved. In addition, the direct comparison of the usual electrochemical impedance data and ac-SECM results obtained simultaneously permits characterisation of processes occurring at the surface and in solution.
引用
收藏
页码：2177 / 2183
页数：7
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