Pt-Rh-YSZ气敏电极微观形貌和伏安特性研究

发布时间：2018-05-12 02:12

  本文选题：Pt-Rh-YSZ + 气敏电极　； 参考：《稀有金属》2017年12期

【摘要】：NOx传感器是发动机尾气中氮氧化合物检测的关键器件,而具有NO分解活性的气敏电极材料则是NOx传感器中的关键材料。本文对YSZ掺杂量与Pt/Rh配比对Pt-Rh-YSZ气敏电极的微观形貌和伏安特性的影响进行了研究,通过制备不同粉体配比的电极样品,利用扫描电镜(SEM)和自制实验装置对其形貌和模拟气氛中的电化学性能进行了观察和测试。实验结果表明,YSZ粉末的加入能够明显改善Pt-Rh电极与基体的共烧匹配性,且能在微观尺度上使电极的三相界面结构更丰富,当YSZ含量超过12%时,电极表面的复杂孔洞结构减少;各电极在700℃出现阴极峰,最大峰值电流为11.29 mA;Rh粉的加入能在更微观的尺度上增加层状结构,并增大电极的活性;Pt/Rh配比影响电极活性,不同粒径的Pt和Rh质量比越接近1∶1,电极的活性越强。
[Abstract]:The NOx sensor is the key device for the detection of nitrogen and oxygen compounds in engine exhaust gas, and the gas-sensing electrode material with no decomposition activity is the key material in the NOx sensor. In this paper, the effects of YSZ doping and Pt/Rh ratio on the micromorphology and voltammetric characteristics of Pt-Rh-YSZ gas sensing electrode were studied. The electrode samples with different powder ratios were prepared. The morphology and electrochemical properties in simulated atmosphere were observed and measured by SEM and self-made experimental apparatus. The experimental results show that the co-firing matching between Pt-Rh electrode and substrate can be improved obviously with the addition of YSZ powder, and the three-phase interface structure of the electrode can be enriched on the micro scale. When the content of YSZ exceeds 12, the complex pore structure on the electrode surface decreases. The cathodic peak appeared at 700 鈩，

本文编号：1876652