ELECTROCHEMICAL GAS SENSOR FOR DETECTING HYDROGEN CYANIDE GAS

A method for detecting hydrogen cyanide (HCN), the method comprising: receiving an ambient gas into a housing of a sensor, wherein the ambient gas comprises HCN gas and hydrogen sulfide (H2S) gas, and wherein the sensor comprises a porous working electrode and a counter electrode; filtering the H2S gas from the ambient gas through a filter, wherein the filter comprises approximately 3 grams of silver sulfate layered onto an approximately 8 grams of polytetrafluoroethylene (PTFE) support material; applying a voltage potential between the counter electrode and the porous working electrode; contacting the ambient gas with the porous working electrode; allowing the ambient gas to diffuse through the porous working electrode to contact an electrolyte within the housing; generating a current between the porous working electrode and the counter electrode in response to a reaction between the ambient gas and the electrolyte at a surface area of the porous working electrode; and determining a concentration of the HCN in the ambient gas based on the current.