Predicting Lifetime and Reliability of Porous Platinum Electrodes in Solid-State Electrolyte Sensors: An Atomic Anharmonic Theory Approach.

ABSTRACT

Solid-state electrolyte sensors operate at high temperatures for extended periods of time, which can cause internal structural deformation and degradation of material properties due to issues such as mismatched coefficients of thermal expansion. Therefore, predicting and extending the lifetime of sensors are urgent and important issue. In this study, the relationship between the damping coefficient of electrode materials and the porosity and temperature was determined using atomic anharmonic theory. A lifetime model for the porous platinum electrode was established, and the effects of porosity and anharmonic atomic vibrations on the characteristic lifetime and reliability of porous platinum electrodes were investigated. The results show that the morphology parameters of the electrode material increase nonlinearly with increasing temperature but the change is very small. The characteristic lifetime decreases sharply at first and then tends to remain constant with increasing porosity. In the case of the simple harmonic approximation, neither the characteristic lifetime nor the reliability of the electrode material changes with temperature. However, considering the anharmonic atomic vibration, the characteristic lifetime and reliability of the electrode material are smaller than those of the simple harmonic approximation, and both of them decrease with increasing temperature. The higher the temperature, the greater the difference between the results of anharmonic and harmonic, and the more significant the anharmonic effect. The reliability decreases with an increasing porosity and time.