孔隙率对传感器多孔电极材料导电性能的影响

doi:10.11896/cldb.20070063

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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.

Key words： porous electrode materials for sensors electrical conductivity thermal stability porosity anharmonicity

Published: 30 September 2021

CLC number:

TP212

Fund:This work was financially supported by the General Program of Chongqing Natural Science Foundation (cstc2020jcyj-msxmX0920), Science and Technology Project of Chongqing Education Commission (KJQN202101304), Yongchuan District Natural Science Foundation(2021yc-jckx20045).

About author:: Junhua Gao received her M.S. degree in microelectronics and solid-state electronics from Heilongjiang University in June 2015. She is currently a lecturer at Chongqing College of Arts and Science and her research interests were functional materials and devices. In September 2020, she studied for a doctorate degree in electronic science and technology at Heilongjiang University, with a research field of micro-nano devices and encryption technology.

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	GAO Junhua
	HUANG Hao
	ZENG Chong
	ZHENG Ruilun

Cite this article:

GAO Junhua,HUANG Hao,ZENG Chong, et al. Effect of Porosity on the Electrical Conductivity of Porous Electrode Materials for Sensors[J]. Materials Reports, 2021, 35(18): 18018-18023.

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http://www.mater-rep.com/EN/10.11896/cldb.20070063 OR http://www.mater-rep.com/EN/Y2021/V35/I18/18018

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