YSZ (yttria-stabilized zirconia)-based mixed potential type H2S sensor with La2NiO4 used as sensitive electrode and method for preparing YSZ-based mixed potential type H2S sensor
A hybrid potential-type, sensitive electrode technology, applied in chemical instruments and methods, instruments, scientific instruments, etc., can solve the problems of inability to detect diabetes diagnosis in real time, high price, large volume, etc., and achieve the improvement of the minimum detection limit and simple preparation method , The effect of low raw material prices
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Embodiment 1
[0050] Preparation of La using the sol-gel method 2 NiO 4 Sensitive electrode material, by adding different amounts of citric acid to improve the microscopic morphology of the electrode material, the sintering temperature is 1000 ° C, using this material to make YSZ-based hybrid potential type H 2 S sensor, and test the gas sensitivity characteristics of the sensor, the specific process is as follows:
[0051] 1. Make a Pt reference electrode: use Pt slurry to make a layer of Pt reference electrode with a length of 0.5mm*2mm and a thickness of 20μm on one end of the upper surface of the YSZ substrate with a length and width of 2mm and a thickness of 0.2mm, and use a 2cm long Pt reference electrode After the Pt wire is folded in half, it is glued to the middle of the reference electrode to lead out the electrode lead; then the YSZ substrate is baked at 120°C for 2 hours, and then put into a muffle furnace for sintering at 950°C for half an hour, so as to eliminate the loosenes...
Embodiment 2
[0058] Tested La 2 NiO 4 YSZ-based hybrid potential type H for sensitive electrode materials 2 Sensitivity of the S sensor.
[0059] Connect the sensor on the Rigol signal tester, put the sensor made of three different electrode materials at 500ppb H 2 The voltage signal test was carried out in S atmosphere.
[0060] Table 1 lists the YSZ-based hybrid potentiometric sensors made of three materials as electrode materials at 500ppbH 2 Response values in S atmosphere. It can be seen from the table that when the molar ratio of citric acid to metal ions is 1:1, the device is 2 S has the largest response value. It can be seen that the sensitive characteristics of sensitive electrode materials can be affected by changing the amount of complexing agent citric acid added. Table 2 lists the sensors placed in air, 0.1ppm H 2 S, 0.2ppm H 2 S, 0.5ppm H 2 S, 1ppmH 2 S, 2ppmH 2 S. The potential signal test in the atmosphere and the potential signal test of the above atmosphere ...
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