Electrochemical characterization of the clay-enhanced luminol ecl reaction

Abstract

Abstract Clay modified electrodes were prepared with iron-containing clay particles (montmorillonite K10) and characterized for their ability to promote electrogenerated chemiluminescence (ecl) in a solution containing luminol and hydrogen peroxide. Electrochemical impedance spectroscopic (EIS) measurements showed that the charge-transfer resistance measured for the clay electrode decreased systematically with the addition of luminol or H 2 O 2 , leading to a linear relationship between the exchange current and the concentration of H 2 O 2 or luminol in the region where [luminol]/[H 2 O 2 ] or [H 2 O 2 ]/[luminol]