High temperature calcination for analyzing influence of 3d transition metals on gas sensing performance of mixed potential sensor Pt/YSZ/LaMO₃ (M = Mn, Fe, Co, Ni)

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• 作者：Nguyen Duc Tho^a ; Do Van Huong^b ; Ho Truong Giang^b ; ^{gianght@ims.vast.ac.vn" class="auth_mail" title="E-mail the corresponding author} ; Pham Quang Ngan^b ; Giang Hong Thai^b ; Do Thi Anh Thu^b ; Do Thi Thu^b ; Nguyen Thi Minh Tuoi^b ; Nguyen Ngoc Toan^b ; Pham Duc Thang^c ; Hoang Nam Nhat^c
• 关键词：Mixed potential gas sensor ; Solid electrolyte YSZ ; Perovskite oxide electrode
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 February 2016
• 年：2016
• 卷：190
• 期：Complete
• 页码：215-220
• 全文大小：2075 K

文摘

In this work, the perovskite-type oxides LaMO₃ (M = Mn, Fe, Co, Ni) were utilized for sensing electrodes of the electrochemical gas sensors based on the electrolyte YSZ (ZrO₂ + 8%mol Y₂O₃). The sensors with configuration of Pt/YSZ/LaMO₃ were sintered at high temperature of 1200 °C in order to analyze influence of the 3d transition metals (M) on gas-sensing characteristics of the perovskite-type oxide electrodes. The sensors were investigated by exposing to various gases of NO₂, NO, CO, C₃H₈ and CH₄. The sensor Pt/YSZ/LaFeO₃ had the best sensitive and selective characteristics to NO₂ gas. The sensors Pt/YSZ/LaMO₃ (M = Mn, Co, Ni) showed poor gas-selectivity. Valence variation of the 3d transition elements was used to explain the gas-sensing performance of the sensors Pt/YSZ/LaMO₃. The electrical conductance behavior of the oxides LaMO₃ was also considered as an important parameter that affected to sensitivity of the sensors Pt/YSZ/LaMO₃, particularly in the high operating temperature.