Počet záznamů: 1  

Effective Surface Area of Electrochemical Sensors

  1. 1.
    0431823 - UPT-D 2015 RIV US eng J - Článek v odborném periodiku
    Krejčí, J. - Sajdlová, Z. - Neděla, Vilém - Flodrová, Eva - Šejnohová, R. - Vránová, H. - Plička, R.
    Effective Surface Area of Electrochemical Sensors.
    Journal of the Electrochemical Society. Roč. 161, č. 6 (2014), B147-B150. ISSN 0013-4651
    Grant CEP: GA MPO FR-TI1/118
    Institucionální podpora: RVO:68081731
    Klíčová slova: scanning electron microscopy * glassy-carbon electrode * gold electrodes * biosensors
    Kód oboru RIV: JB - Senzory, čidla, měření a regulace
    Impakt faktor: 3.266, rok: 2014

    The article compares the determination of an SPE (Screen Printed Electrodes) electrochemical active surface (AS) by the analysis of cyclic voltammogram in ferro-ferricyanide using Koutecky equation and by confocal and electron microscopy. SPE reliability is influenced by mass transport of analyte to active electrode surface while the physical properties of SPE are reproducible and stable. The electrode reaction involves the upper layer of SPE. The AS is the same as the geometrical area. Other methods set the active/geometrical area relation to 2,03 +/- 0,04 (gold working electrode) and 4,35 +/- 0,08 (platinum working electrode). It is demonstrated that nanostructures on working electrode surface can be efficient at high frequencies (> 10 kHz). The active area of SPE determined by scanning electron microscopy or optical measurement exhibits a standard deviation lower than 2%. It proves SPE be reliable and precise electrochemical device under optimal hydrodynamic conditions.
    Trvalý link: http://hdl.handle.net/11104/0236366