Abstract
Previous work has demonstrated the potential for high-performance, low-cost NOx (NO and NO2) solid-state electrochemical sensors based on porous Y2O3-stabilized zirconia (YSZ) electrolyte and dense Sr-doped LaMnO3 electrodes using an impedancemetric measurement approach. However, microcracking in the YSZ electrolyte has been observed after processing at 1000 {degree sign}C, which can impact sensor stability and lifetime. The microcracking results from mismatch in the coefficients of thermal expansion of the YSZ electrolyte and the alumina (Al2O3) substrates used in these cells. The effects of microcracking were investigated by comparing the performances of sensors built on three different substrates with different thermal mismatch characteristics with the YSZ electrolyte: 1) Al2O3, 2) YSZ, and 3) Al2O3 coated YSZ. Microcracking in the YSZ electrolyte was only evident with the Al2O3 substrates, but this had no discernible effect on the performance of the NOx sensor on the experimental timescales employed.
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