本文選題：Pt-Rh-YSZ + 氣敏電極��； 參考：《稀有金屬》2017年12期

【摘要】：NOx傳感器是發(fā)動機尾氣中氮氧化合物檢測的關鍵器件,而具有NO分解活性的氣敏電極材料則是NOx傳感器中的關鍵材料。本文對YSZ摻雜量與Pt/Rh配比對Pt-Rh-YSZ氣敏電極的微觀形貌和伏安特性的影響進行了研究,通過制備不同粉體配比的電極樣品,利用掃描電鏡(SEM)和自制實驗裝置對其形貌和模擬氣氛中的電化學性能進行了觀察和測試。實驗結果表明,YSZ粉末的加入能夠明顯改善Pt-Rh電極與基體的共燒匹配性,且能在微觀尺度上使電極的三相界面結構更豐富,當YSZ含量超過12%時,電極表面的復雜孔洞結構減少;各電極在700℃出現(xiàn)陰極峰,最大峰值電流為11.29 mA;Rh粉的加入能在更微觀的尺度上增加層狀結構,并增大電極的活性;Pt/Rh配比影響電極活性,不同粒徑的Pt和Rh質量比越接近1∶1,電極的活性越強。
[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，

本文編號：1876652