2006/07/28 by Peng Sun, Michael V. Mirkin · 3 citations
Chemistry · Materials Science · Chemical Engineering · #Electrochemical Analysis and Applications #Conducting polymers and applications #Analytical Chemistry and Sensors #Scanning electrochemical microscopy #Chemistry #Ultramicroelectrode #Analytical Chemistry (journal) #Voltammetry #Electron transfer #Electrode #Kinetics #Reaction rate constant #Cyclic voltammetry #Substrate (aquarium) #Micrometer #Scanning electron microscope #Kinetic energy #Steady state (chemistry) #RADIUS #Range (aeronautics) #Electrochemistry #Optics #Physical chemistry #Materials science #Chromatography
paper · doi:10.1021/ac060924q
openalex publication_date 2006/07/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26
The kinetics of several fast heterogeneous electron-transfer reactions were investigated by steady-state voltammetry at nanoelectrodes and scanning electrochemical microscopy (SECM). The disk-type, polished Pt nanoelectrodes (3.7-400-nm radius) were characterized by a combination of voltammetry, scanning electron microscopy, and SECM. A number of experimental curves were obtained at the same nanoelectrode to attain the accuracy and reproducibility similar to those reported previously for micrometer-sized probes. A new analytical approximation was developed and used for analysis of steady-state tip voltammograms. The self-consistent kinetic parameter values with the uncertainty margin of approximately 10% were obtained for electrodes of different radii and for a wide range of the SECM tip/substrate separation distances. The determined standard rate constants are compared to those previously measured at the electrodes of different dimensions, and the correlation between the heterogeneous and self-exchange rate constants is discussed.