Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7138855 | Sensors and Actuators B: Chemical | 2018 | 31 Pages |
Abstract
In this paper, an amperometric gas sensor based on proton exchange membrane (Nafion) was fabricated for H2S detection at room temperature. Pt-Rh nanoparticles loaded on carbon fibers, as sensing electrode, was prepared by chemical reduction method, and membrane electrode assemble (MEA) was fabricated using hot-pressing method. X-ray diffractometry (XRD) and field emission scanning electron microscopy (FESEM) were used to analyze the structure and morphology of the fabricated electrode material. The effect of the weight ratio of Pt to Rh on the performance of the sensor was investigated and the results showed that the sensing performance was best when the ratio of Pt to Rh was 1:1. Moreover, the sensitivity had been significantly improved due to the use of carbon fibers pretreated by nitric acid, increasing from 0.158â¯Î¼A/ppm to 0.191â¯Î¼A/ppm. The present sensor could detect H2S at levels as low as 0.1â¯ppm with a â20â¯nA response and had a good linear relationship in the range of 0.1 to 200â¯ppm H2S. In addition, this amperometric H2S sensor displayed fast response-recovery rate as well as excellent selectivity and stability.
Related Topics
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Authors
Xinyu Yang, Yueying Zhang, Xidong Hao, Yang Song, Xishuang Liang, Fengmin Liu, Fangmeng Liu, Peng Sun, Yuan Gao, Xu Yan, Geyu Lu,