Solid polymer electrolyte-based hydrogen sulfide sensor

The performance of the solid polymer electrolyte (SPE)-H2S sensor has been studied. It was found that the electrochemical oxidation of H2S was controlled by the gas diffusion. That is the basis of the quantitative determination of H2S. The factors affecting the stability of the sensor have been studied. The results indicated that elemental sulfur was the main factor. In contrast with the H2S sensors reported in the liquid electrolyte systems, the stability of SPE-H2S sensor is better. The result was believed to be directly related to the porous and channeled structure of SPE-H2S electrode. In addition, the SPE-H2S sensor has many advantages, including a fast response, a satisfactory linearity and good reproducibility.