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Industrialization and urbanization have primarily contributed to air pollution, necessitating the need for the development of better sensing devices. Unlike other gases, Carbon dioxide (CO 2 ) is more stable in the environment and poses a serious threat to the environment and health. Thus, the detection of CO 2  gas becomes imperative. In the present work, a 3-electrode electrochemical cell was developed to detect CO 2  gas. The working electrode (Cu x O/Cu) was prepared by anodization of copper foil and the characterization studies has been done using XRD, SEM and FTIR techniques. The quantitative analysis of CO 2  gas was performed by electrochemical techniques such as Cyclic Voltammetry (CV) and TAFEL. The potential window for CV was between −0.6 V to 1 V and −2 V to 1 V for NaCl and KCl electrolyte, respectively. The sensor developed has lower response time and could detect CO 2  gas of concentrations upto 8000 ppm in both electrolytes. The sensor with KCl electrolyte showed a better response than NaCl, with a reduction current density of 0.016A.

Cu x O/Cu based electrochemical sensor for the detection of CO 2 gas