硫化銀を用いた水素連続測定用検出素子の試作

概要

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A new sensor for continuous monitoring of hydrogen was developed by using a silver sulfide and silver iodide solid electrolyte. The sensor is expressed as Pt/Ag_2S/Ag_2S+AgI/AgI/Ag, and can be formed easily into a form of small disk with a die and press. Silver powder, silver iodide, mixture of silver sulfide and silver iodide, silver sulfide and a platinum gauze were placed in layers in the die, and 600 kg/cm^2 of pressure was applied. The diameter and thickness of the disk were 13 mm and 2.1 mm, respectively. The cell was then transferred in a heating air bath held at 350℃, and a constant voltage of 3 μV was applied. When the sample gas containing hydrogen was impinged on the platinum anode of the sensor, an electrolytic current flowed through the external circuit of the sensor. The current was proportional to the concentration of hydrogen at a constant bath temperature and constant flow rate of the gas. The calibration curve for hydrogen was rectilinear between 100〜1000 ppm, and the relative standard deviation in this range was within 5.0%. The detection limits of hydrogen at the flow rate of 50 cm^3/min was 50 ppm, and the response time was about 13 min for 500 ppm hydrogen. When hydrogen (500 ppm H_2/N_2) was impinged on the sensor for about 6 h/d, the sensitivity after 33 days exposure decreased to about 80% of the original value.
社団法人日本分析化学会の論文
1986-09-05