Development of a Low Cost Electrochemical CO Monitor Based on Anodic Scanning Voltammetry in Nonaqueous Electrolyte

摘要

The feasibility of an electrochemical cell for the detection of carbon monoxide concentration in the range from 10-1000 ppm has been demonstrated. The cell consists of a nonaqueous electrolyte solution, a sensing electrode, a counter electrode, and a reference electrode with separators and a micro-porous teflon membrane in a sandwich configuration. The cell is interrogated by the technique of anodic scanning voltammetry. Carbon monoxide is oxidized at the sensing electrode at a specific potential generating a characteristic peak current which is proportional to CO concentration. The integrated area under the peak (charge in coulombs) is proportional to the number of oxidized CO molecules. A simple mathematical model based on Langmuir adsorption isotherm has been developed to explain the dosimeter type of response by the cell.