SEC-C Spectroelectrochemical Cell

Spectroelectrochemistry (SEC) is aimed at the investigation of electrochemical reaction mechanism and the interface structure between electrolyte solution and electrode. Remarkable progress in this field and related technology enables SEC to be applied in wide areas.
Nowadays, the relation between absorbance and potential for reversible or quasi-reversible system is theoretically elucidated, on which basis the analysis of electrochemical characteristics becomes possible for the system otherwise difficult with only the result of voltammogram.
Typical example is redox enzyme cytochrome c and methylene blue.

  • Two varieties optical path length (0.5 and 1.0 mm)
  • Designed to use the 6.0 mm reference electrode
  • Two varieties of working electrodes (Au or Pt)
  • Be able to use in a standard spectrometer

Comparison of 0.5 and 1.0 optical path length cell

The electrolysis stabilization time for the 0.5 mm optical path length cell is theoretically a half, compared with the 1.0 mm cell. It is the opposite, for the concentration, when the same result for the 1.0 mm cell is possible for a half of the concentration compared with the 0.5 mm cell. You could select the optical path length and the working electrode appropriate for your research purpose.

Optical path length Merit Demerit
0,5 mm High electrolytic speed Difficult maintenance
1,0 mm Easy maintenance Slow electrolytic speed

 

Comparison of the electrolysis reaction equilibrium time

For the comparison of the 0.5 and 1.0 optical path length cells, there is a difference between the theoretical and experimental values. It is in consequence of the experimental conditions.

Fig.1-1. Absorbance for electrolysis performed with 0.5 mm optical path length cell   Fig.1-2. Absorbance for electrolysis performed with1.0 mm optical path length cell
Fig.1-1. Absorvência para eletrólise realizada com célula de comprimento do trajeto óptico de 0,5 mm   Fig.1-2. Absorvência para eletrólise realizada com célula de comprimento de trajeto óptico de 1,0 mm

A 2 mM potassium ferrocyanide (K4[Fe(CN)6]) was subjected to an electrolysis reaction at 0.6 V until its stability, and 1 M KNO3 was used as a reference. The oxidation reaction was monitored by the comparison of the absorbance in function of the time at wavelengths of 420 and 300 nm.

 

 

Optical path length 1.0 mm cell

SEC-C Thin Layer Quartz Glass Spectroelectrochemical cell Kit  working electrode

 

The optical path length 1.0 mm is most suitable for basic spectrum electrochemistry measurements. Theoretically, it is possible to get the same result as for