Application of chemometrics to electroanalytical chemistry

Abstract

English Abstract: In this report, two applications of chemometrics to electroanalytical chemistry are presented. In addition to potential and electric current, other information such as heat evolution of electrode reaction or Raman spectral peak analysis of specific species gives many useful information to figure out reactions and species. The electrochemical heat evolution is related to the entropy change of the reaction so that two different electrochemical reactions with different entropy change can be easily separated. But, a quantity we measure is temperature change of the electrode, which is delayed from real heat evolution due to heat capacity and so on. So the measured temperature change has to be deconvoluted to the true heat evolution by a mathematical method using the delay function. Another example of the deconvolution technique is to measure the Raman spectral peak of specific species to estimate its spatial change of the concentration in solution from the electrode surface by using a focal depth profile of the objective lens used in Raman microscope technique as a window function.