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氧化锆型O2传感器的原理 Principle of Zirconia type O2 Sensor

  • 管理者 (nanoionicsch)
  • 2019-02-15 11:57:00
  • hit847
  • vote3
  • 106.240.248.210

氧化钇稳定的氧化锆(YSZ)是高温下的纯氧离子导体,具有很高的化学稳定性,可用于许多领域,包括燃料电池,氧气传感器和绝缘涂层等。

Yttria-stabilized zirconia (YSZ) is a pure oxygen ion conductor at high temperatures and has high chemical stability, which is used in many areas, including fuel cells, oxygen sensors and insulation coatings.

通过在氧化锆中掺入氧化钇,产生氧离子空位,以提高氧离子的导电性。

By incorporating yttria into zirconia (YSZ), oxygen ion vacancies are generated to improve the conductivity of oxygen ions.

 

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(图1)YSZ-单位晶格结构

(Illustrated in Figure 1) YSZ- Unit cell structure

( J. Phys.: Condens. Matter 25, 2013, 395001)

 

我公司生产的氧气传感器主要使用8mol%氧化钇稳定氧化锆(YSZ),这是氧离子导体的最佳组成成分之一。

Our company produces oxygen gas sensors mainly using 8mol% yttria-stabilized zirconia (YSZ), which is one of the best compositions for an oxygen ionic conductor.

 

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(图2)利用YSZ的氧化锆氧气传感器的结构

(illustrated in Figure 2) Structure of Zirconian Oxygen Sensors Using YSZ

 

如图2所示,氧化锆氧传感器具有参考电极和工作电极彼此隔离的结构。

As illustrated in Figure 2, a zirconia oxygen sensor has a structure with a reference electrode and a working electrode isolated from each other.

 

参比电极暴露在氧气分压始终为21%的环境大气中。 待测量的采样气体循环经过工作电极以测量氧气分压。

The reference electrode is exposed to the ambient atmosphere that always has an oxygen partial pressure of 21%. The sampling gas to be measured flows onto the working electrode. The sampling gas to be measured circulates through the working electrode to measure the oxygen partial pressure.

 

气态氧分子通过以下反应方程式填充YSZ表面上的氧离子空位,并且此时电子消失。

Oxygen molecules in a gaseous state fill the vacancies of oxygen ions on the surface of YSZ through the following reaction formula, and electrons are lost.

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在固定温度下,各电化学组分的浓度可以用质量作用定律表示。

At a fixed temperature, the concentration of each electrochemical species can be expressed as the following formula by the mass action law.

 

氧离子空位的浓度取决于氧化钇的掺杂浓度,因此电子浓度与氧分压成正比。

The concentration of the oxygen ion vacancy is decided by the doping concentration of Yttria, therefore the concentration of electrons is proportional to the oxygen partial pressure.

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因此,参考电极和工作电极之间的氧分压差导致YSZ上两个电极之间的电势差。

Hence, the difference in oxygen partial pressures between the reference electrode and the working electrode results in an electrical potential difference between the two electrodes on the YSZ.

 

两个电极之间的电势差由能斯特方程定义。

The potential difference between the two electrodes is defined by the Nernst equation.

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由于参考电极处的氧分压是已知的,因此测量两个电极之间的电势差可以计算出样品气体中的氧分压。

Since the oxygen partial pressure at the reference electrode is known, Measuring the potential difference between the two electrodes allows the calculation of the oxygen partial pressure in the sample gas.

 

氧化锆氧气传感器由于其优异的化学稳定性和耐腐蚀性能,在各种气体条件下都能非常稳定地工作,因此可以在各种应用领域中广泛使用,测量任何实际范围内的氧气分压。

Because of its excellent chemical stability and corrosion resistance, the zirconia oxygen sensor can work stably under various gas conditions, so it can be widely used in various application fields to measure the oxygen partial pressure in any practical range.

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