Potentiometric hydrogen sensor using strontium and iron-doped lanthanum chromate as sensitive electrode and manufacturing method of potentiometric hydrogen sensor

A sensitive electrode and potential-type technology, applied in the direction of material electrochemical variables, can solve the problems of small ignition energy, easy to cause explosion accidents, wide explosion limit, etc., achieve fast response speed, improve gas sensitivity performance, and high response value Effect

Active Publication Date: 2017-05-31
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because hydrogen has a wider explosion limit (4.0% to 75.6%) and a smaller ignition energy (0.019mJ), once a leak occurs, it is easy to cause an explosion accident if it is not found in time

Method used

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  • Potentiometric hydrogen sensor using strontium and iron-doped lanthanum chromate as sensitive electrode and manufacturing method of potentiometric hydrogen sensor
  • Potentiometric hydrogen sensor using strontium and iron-doped lanthanum chromate as sensitive electrode and manufacturing method of potentiometric hydrogen sensor
  • Potentiometric hydrogen sensor using strontium and iron-doped lanthanum chromate as sensitive electrode and manufacturing method of potentiometric hydrogen sensor

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Effect test

Embodiment 1

[0026] The potentiometric hydrogen sensor of the present embodiment is based on La 0.8 Sr 0.2 Cr 0.5 Fe 0.5 o 3-δ As a sensitive electrode, with Pt as a reference electrode, and YSZ as a solid electrolyte, the preparation method is as follows:

[0027] (1) Mix terpineol and ethyl cellulose in a mass ratio of 9:1 to obtain modified terpineol; weigh a certain amount of commercial La 0.8 Sr 0.2 Cr 0.5 Fe 0.5 o 3-δ powder, drop the same mass of modified terpineol into the powder, and then fully grind for 2 hours to obtain a sensitive electrode slurry;

[0028] (2) Take a YSZ electrolyte substrate with a diameter of 13mm; brush the sensitive electrode slurry on the electrolyte substrate by screen printing, and then place the electrolyte substrate in an oven at 150°C for 30 minutes to dry the electrolyte substrate in the sensitive electrode slurry The organic solvent is completely volatilized, and then the electrolyte substrate is calcined at 1000°C for 3 hours to increase ...

Embodiment 2

[0035] The structure and preparation method of the potentiometric hydrogen sensor in this embodiment are the same as those in Embodiment 1, except that the solid electrolyte substrate used is GDC, and the obtained sensor is denoted as LSCF / GDC / Pt sensor.

[0036] Figure 5 It is the response diagram of the LSCF / GDC / Pt sensor obtained in this example to different concentrations of hydrogen at 500°C. It can be seen from the figure that the response value of the sensor to 100ppm hydrogen is 48mV, and the sensitivity of the sensor is 86mV / decade.

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Abstract

The invention discloses a potentiometric hydrogen sensor using strontium and iron-doped lanthanum chromate as a sensitive electrode and a manufacturing method of the potentiometric hydrogen sensor. The potentiometric hydrogen sensor uses La<1-x>Sr<x>Cr<1-y>FeyO<3-delta> as a sensitive electrode, Pt as a reference electrode, and YSZ or GDC as a solid electrolyte, wherein x is more than or equal to 0.1 and less than or equal to 0.6, and y is more than or equal to 0.3 and less than or equal to 0.7. The potentiometric hydrogen sensor disclosed by the invention uses a perovskite structure oxide La<1-x>Sr<x>Cr<1-y>FeyO<3-delta>, which has relatively good electrochemical catalytic activity to hydrogen, as a sensitive electrode, so that the sensor can have a relatively high response value to hydrogen; and YSZ or GDC is used as an electrolyte, so that the gas sensitivity and long-term stability of the sensor can be improved.

Description

technical field [0001] The invention belongs to the field of gas sensors, in particular to a 1-x Sr x Cr 1-y Fe y o 3-δ A mixed-potential hydrogen sensor with a sensitive electrode and a manufacturing method thereof. Background technique [0002] Under normal temperature and pressure, hydrogen is a colorless, transparent, tasteless and odorless gas. Because of its advantages of easy acquisition, renewable, high calorific value, and non-polluting products, it has been widely used in medical, aerospace and other fields. However, because hydrogen has a wide explosion limit (4.0%-75.6%) and a small ignition energy (0.019mJ), once a leak occurs, it is easy to cause an explosion accident if it is not found in time. Therefore, it is very important to develop a hydrogen sensor with fast response and high sensitivity to ensure the safe application of hydrogen. [0003] According to different detection principles, hydrogen sensors can be divided into semiconductor type, catalyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/30
Inventor 易建新张赫张作彬姜羲
Owner UNIV OF SCI & TECH OF CHINA
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