Potentiometric-Type Gas Sensor Using MgFe₂O₄ Sensing Electrode for Detection of Hydrocarbon Based on Carbon Number

Hydrocarbon(HC) monitoring is necessary for safe andeffectiveoperations in industries such as petroleum and gas. In this study,total hydrocarbons can be detected by using yttria-stabilized zirconia(YSZ)-based potentiometric-type gas sensor using MgFe2O4 sensing electrode (SE). The sensor was found to generatea similar response magnitude to those of hydrocarbons that have thesame carbon number, irrespective of the type of carbon bond (totalhydrocarbon detection). Aside from being capable of detecting totalhydrocarbons sensitively and selectively with rapid response time,the sensor using MgFe2O4-SE also exhibited alinear relationship between sensor responses and carbon number. Inaddition to that, the developed sensor showed a logarithmically linearrelationship between sensor responses and HC concentration in therange 20-700 ppm. These sensing characteristics were confirmedto be reproducible, and sensor responses toward HC were found to berepeatable and gradually decreased with increasing in O-2 concentration in the range of 3-21 vol %.