EXPLORING THE ELECTROCHEMICAL SENSING CAPABILITY OF Cu-OMS-2 MATERIAL FOR FORMALDEHYDE DETECTION

Abstract

Formaldehyde (HCHO) is a widely used compound in various industries, including construction,
automotive production, and interior decoration fields. However, HCHO is much concerned as a harmful
substance that can negatively impact human health, even at low concentrations, in extended periods of
exposure. Therefore, the detection of HCHO at low concentrations is crucial. In this study, copper-modified
cryptomelane (Cu-OMS-2) was synthesized by reflux method. Cu-OMS-2 electrode exhibited the ability of
HCHO detection at a concentration of 1 mM by electrochemical analysis method. A shift in the reduction
peak (from -0.6 to 0.0 V) was observed with increase of HCHO concentrations (from 1 to 5 mM). A linear
relationship between these two variables was established, described by the equation y = -0.7023.x + 0.1321,
with a high correlation coefficient (R2 = 0.99). These results demonstrate the potential of Cu-OMS-2
material for the electrochemical detection of HCHO at low concentration.