Abstract
The performance of the solid polymer electrolyte (SPE)-H 2S sensor has been studied. It was found that the electrochemical oxidation of H 2S was controlled by the gas diffusion. That is the basis of the quantitative determination of H 2S. 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 H 2S sensors reported in the liquid electrolyte systems, the stability of SPE-H 2S sensor is better. The result was believed to be directly related to the porous and channeled structure of SPE-H 2S electrode. In addition, the SPE-H 2S sensor has many advantages, including a fast response, a satisfactory linearity and good reproducibility.
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