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Electrochemical sensor for monitoring nitrogen content, and manufacturing method for sensor

An electrochemical and sensor technology, applied in the field of electrochemical sensors for monitoring nitrogen content and its preparation, can solve the problems of poor compatibility, mutual repulsion, single phase number of compounds, etc., achieve small interface internal resistance, precise control of thickness, and good The effect of ionic conductivity

Active Publication Date: 2019-01-18
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the above technical problems, the object of the present invention is to provide an electrochemical sensor for monitoring nitrogen content, which not only has excellent thermal shock resistance, high temperature resistance, but also has good conductivity of the auxiliary electrode in the electrochemical sensor, and is compatible with solid electrolyte It has excellent chemical compatibility; the number of compound phases is relatively single, which avoids the problem of poor compatibility and mutual exclusion. At the same time, the battery reaction process is simpler and the working performance is more stable. Therefore, it is a nitrogen sensor with better performance. Especially suitable for on-line monitoring of nitrogen content in iron and steel metallurgy process

Method used

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  • Electrochemical sensor for monitoring nitrogen content, and manufacturing method for sensor
  • Electrochemical sensor for monitoring nitrogen content, and manufacturing method for sensor
  • Electrochemical sensor for monitoring nitrogen content, and manufacturing method for sensor

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preparation example Construction

[0048] see figure 2 Shown is a flow chart of the preparation method of an electrochemical sensor for monitoring nitrogen content of the present invention. It basically includes steps: S1: preparation of YSZ solid electrolyte layer; S2: high-temperature surface nitriding treatment: use high-temperature surface nitriding method to make one side surface of the YSZ solid electrolyte layer contact with metal nitride powder, bake at high temperature and nitrogen Under the protection of the atmosphere, the side surface of the YSZ solid electrolyte layer is nitrided, and a layer of nitrogen ion and oxygen ion co-doped zirconia layer (YNSZ Auxiliary electrode layer); S3: Coating NiO and Ni mixed powder on the surface of the other side of the YSZ solid electrolyte layer to prepare a reference electrode layer. Preferably, step S3 is to use cold air power spraying technology to spray NiO and Ni mixed powder onto the surface of the YSZ solid electrolyte layer, the bonding strength is hig...

Embodiment 1

[0075] Step 1. Prepare YSZ solid electrolyte powder: weigh 7.82g YCl 3 , 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, dry at a constant temperature for 24 hours, grind it in an agate mortar for 0.5 hours, and then roast it in a high-temperature furnace for 10 hours at a temperature of 600°C to obtain Y 2 o 3 Stable zirconia solid electrolyte powder YSZ.

[0076] Step 2. Making the YSZ solid electrolyte layer: Weigh 30g of solid YSZ 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 furnace for sinteri...

Embodiment 2

[0080] The difference between this embodiment and embodiment 1 is that in step 3, the heating temperature in the furnace 40 is controlled to 1600° C. for 8 hours to obtain a YNSZ auxiliary electrode layer 12 with a thickness of 0.8 mm.

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Abstract

The invention relates to an electrochemical sensor for monitoring the nitrogen content. The sensor comprises a solid electrolyte layer which takes Y2O3-doped zirconia (YSZ) as a matrix material, and an auxiliary electrode layer which takes nitrogen-doped Y2O3 stabilized zirconia (YNSZ) formed by replacing partial oxygen ions in the YSZ with nitrogen ions as a matrix material. The invention furtherprovides a manufacturing method for the electrochemical sensor. A high-temperature surface nitriding treatment method is used for generating the YNSZ auxiliary electrode layer with a certain thickness in situ on the surface of the prepared YSZ solid electrolyte, so that the process is rapid and simple, the YNSZ auxiliary electrode layer is compact and pore-free and is tightly and firmly combinedwith the matrix of the YSZ solid electrolyte, the compatibility is good, and the interface resistance is small; and therefore, the nitrogen content electrochemical sensor with the excellent performance can be further obtained by means of the manufacturing method.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to an electrochemical sensor for monitoring 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 monitored, and the experimental results showed good regularity. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
Inventor 刘涛莫扬成温天朋王相南易茂义张震
Owner NORTHEASTERN UNIV
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