An electrochemical sensor for measuring nitrogen content and its preparation method

An electrochemical and nitrogen content technology, applied in the direction of material electrochemical variables, measuring devices, scientific instruments, etc., can solve problems such as poor compatibility, single compound phase number, etc., achieve stable working performance, precise control of width and thickness, The effect of excellent chemical compatibility

Active Publication Date: 2020-04-10
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

[0004] In order to overcome the above-mentioned technical problems, the object of the present invention is to provide a novel electrochemical sensor for measuring nitrogen content, which not only has excellent thermal shock resistance, but also has a relatively single phase number of compounds contained in the electrochemical sensor, avoiding the occurrence of The problem of poor compatibility, and the battery reaction process in the electrochemical sensor is relatively simple, so it is a nitrogen sensor with better performance, especially suitable for online determination of nitrogen content in iron and steel metallurgy processes

Method used

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  • An electrochemical sensor for measuring nitrogen content and its preparation method
  • An electrochemical sensor for measuring nitrogen content and its preparation method
  • An electrochemical sensor for measuring nitrogen content and its preparation method

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preparation example Construction

[0044] see figure 2 Shown is a flow chart of the preparation method of an electrochemical sensor for measuring nitrogen content of the present invention. It basically includes steps: S1: preparing MgSZ solid electrolyte layer; S2: using laser surface nitriding treatment technology, nitriding the surface of one side of the MgSZ solid electrolyte layer to obtain zirconia MgNSZ co-doped with nitrogen ions and oxygen ions Auxiliary electrode layer; S3: the other side surface of MgSZ solid electrolyte layer is coated with Cr 2 o 3 Mix the powder with Cr to prepare the reference electrode layer. Preferably, step S3 is to adopt plasma spraying technology, and Cr 2 o 3 The powder mixed with Cr is sprayed on the surface of the MgSZ solid electrolyte layer to increase the bonding strength, reduce the internal resistance, and make the working performance of the sensor more stable. Understandably, the order of steps S2 and S3 can be switched without affecting the performance of the ...

Embodiment 1

[0070] Step 1. Prepare MgSZ solid electrolyte powder: weigh 3.8g MgCl 2 , 148.24 g ZrOCl 2 ·8H 2 O, dissolved in 1 L of deionized water to give Zr 4+ The concentration is about 0.46mol / L. Stir with a magnetic stirrer, keep the temperature at 25°C, add ammonia water dropwise for co-precipitation, stop the titration when the pH is 9-10, filter the precipitate, wash with distilled water and ethanol three times respectively, and remove Cl - and other impurity ions. Dry the precipitate at a temperature of 75-85°C for 24 hours at a constant temperature, grind it in an agate mortar for 0.5 hours, and then place it in a high-temperature furnace for 10 hours of calcination at a temperature of 600°C to obtain MgO-stabilized zirconia solid electrolyte powder MgSZ.

[0071] Step 2. Making the MgSZ solid electrolyte layer: Weigh 30g of solid MgSZ powder into a 5cm-diameter die, apply 300Mpa axial pressure to press into a sheet-shaped green body, and place it in a high-temperature furna...

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Abstract

The invention relates to an electrochemical sensor for determining nitrogen content, comprising: a solid electrolyte layer, having MgO-doped zirconia MgSZ as a matrix material; and an auxiliary electrode layer, which replaces nitrogen-doped MgO-stabilized zirconia formed by some oxygen ions in MgSZ with nitrogen ions, that is, MgNSZ is the matrix material. The invention further comprises a methodfor preparing the electrochemical sensor, comprising the step of forming a MgNSZ auxiliary electrode layer of a predetermined thickness on the surface of the MgSZ solid electrolyte by using a laser surface nitriding treatment technology on the surface of the prepared MgSZ solid electrolyte, which is not only simple in process with dense and non-porous MgNSZ auxiliary electrode layer, but also firmly bonded to the matrix of the MgSZ solid electrolyte to obtain good compatibility and small interface resistance. Therefore, the preparation method can be used to advance the nitrogen sensor with excellent performance.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to an electrochemical sensor for measuring nitrogen content and a preparation method thereof. Background technique [0002] Precise online measurement of nitrogen content in molten steel is a crucial task in iron and steel metallurgy. Some researchers have used AlN as a solid electrolyte to prepare nitrogen sensors, but because of its high electronic conductivity at high temperatures (solid electrolytes should try to have high ionic conductivity rather than electronic conductivity) and easy oxidation Successfully applied in actual production. Hong Yanruo et al. used the three-phase compound β-Al 2 o 3 +α-Al 2 o 3 +AlN was used as solid electrolyte, metal-metal compound was used as reference electrode, a nitrogen sensor was developed, and the nitrogen activity in Fe-Mn-N and Fe-Mn-V-N alloys was measured, and the experimental results showed good regularity. Howe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/28G01N27/30
CPCG01N27/28G01N27/30G01N27/301
Inventor 刘涛莫扬成王相南李静云易茂义
Owner NORTHEASTERN UNIV LIAONING
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