1 School of Electronic Information and Electrical Engineering, Chongqing University of Arts and Sciences, Engineering Research Center of New Energy Storage Devices and Applications,Chongqing 402160, China 2 School of Electronic Engineering, Heilongjiang University, Harbin 150080, China
Abstract: The electrode material is the key to ensuring the performance of the oxygen sensor. The porosity of the electrode material and the prominent anharmonic effect of atomic vibration have an important influence on its conductivity. In order to improve the electrical conductivity of electrode materials, this paper takes into account the anharmonic vibration of atoms and applies solid-state physics theories and methods to study the changes in electrical conductivity and thermal stability of porous electrode materials for oxygen sensors with temperature, time and particle radius, and the influence of atomic anharmonic vibration and porosity is discussed. The results show that the conductivity of Pt porous electrode materials is smaller than that of bulk electrode material, and the smaller the particles, the greater the difference between the two. The conductivity and thermal stability coefficient of porous Pt electrode material decrease nonlinearly with increasing temperature. When the temperature T<300 K, the change is significant,while when the temperature T>1 000 K, the change is very small and tends to be constant. The conductivity decreases with increasing time, but the change is minimal. While the changing rate of conductivity increases non-linearly with increasing particle radius. Porosity has an effect on the conductivity of the electrode material: the smaller the particle, the greater the porosity, the smaller the conductivity of the electrode material, and the greater the difference between the conductivity in the body and the surface layer of the particle. When the anharmonicity of atomic vibrations is taken into account, the conductivity of the electrode material is greater than the result of the simple harmonic approximation, and the higher the temperature, the greater the difference between the anharmonic and simple harmonic approximation, i.e., the more significant the anharmonic effect.
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2021, Vol. 35 
