Iffelsberger, Christian and Vatsyayan, Preety and Matysik, Frank-Michael (2017) Scanning Electrochemical Microscopy with Forced Convection Introduced by High-Precision Stirring. ANALYTICAL CHEMISTRY, 89 (3). pp. 1658-1664. ISSN 0003-2700, 1520-6882
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In the present report the well-known advantages of hydrodynamic mass transport in electrochemical systems are used in combination with scanning electrochemical microscopy (SECM). The hydrodynamic SECM system integrates a high-precision stirring device into the experimental setup. The well-defined stirring of the SECM electrolyte results in steady state diffusion layer characteristics in the vicinity of large substrate electrodes operated in chronoamperometric measuring mode. For a range of rotation frequencies of a rotating cylinder the thickness and the stability of the diffusion layer was studied by hydrodynamic SECM in the substrate generation/tip collection (SG/TC) as well as in the competition mode using ferrocene methanol as redox mediator. Different UME probe dimensions ranging from Pt diameters of 20 mu m down to 0.6 mu m were used. The smallest probe with d(pt) = 0.6 mu m was found most suitable for these studies due to the almost convection-independent amperometric response associated with sub mu m electrodes. Additionally, preliminary studies of hydrodynamic SECM imaging of a 2 mm Pt disk electrode surface in the SG/TC mode based on in situ produced hydrogen as a mediator are presented. Comparative images measured in the conventional positive feedback mode in quiescent solution show that hydrodynamic SECM offers attractive complementary information.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GENERATION/TIP COLLECTION MODE; DIFFUSION LAYER; CONCENTRATION PROFILES; MICRODISK ELECTRODES; HYDROGEN OXIDATION; ASSISTED INJECTION; SECM; OXYGEN; VOLTAMMETRY; TRANSPORT; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Instrumentelle Analytik (Prof. Frank-Michael Matysik) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:01 |
| Last Modified: | 19 Feb 2019 15:11 |
| URI: | https://pred.uni-regensburg.de/id/eprint/402 |
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