以磷酸型质子交换膜为固体电解质的定电位电解型气体传感器

SO_2 Gas Electrochemical Sensor at Fixed Potential Using Solid Electrolyte of Proton Exchange Membrane Modified with Phosphoric Acid

将一种掺杂磷酸的新型质子交换膜作为定电位电解型气体传感器的固体电解质 ,发现这种膜具有电导率高、粘性好 ,价格低廉和保水性好等优点 .制成的 SO2 气体传感器具有较低的底电流和噪声 ,响应信号与气体浓度之间具有较好的线性关系 。

A new type of proton exchange membrane modified with phosphoric acid is used as a solid electrolyte in the electrochemical gas sensor worked at the fixed potential. It was found that this type of membrane has advantages of high conductivity, good stickness, low price and good water preserving ability. The sensor prepared with this type of membrane possesses low background current and noise. The relationship between gas concentration and response signal is linear. Therefore, it is hopeful to obtain a new type of gas electrochemical sensor with solid electrolyte.