Effect of sintering temperature of mixed potential sensor Pt/YSZ/LaFeO₃ on gas sensing performance

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• 作者：Nguyen Duc Tho^aAuthor Vitae ; Do Van Huong^bAuthor Vitae ; Pham Quang Ngan^bAuthor Vitae ; Giang Hong Thai^bAuthor Vitae ; Do Thi Anh Thu^bAuthor Vitae ; Do Thi Thu^bAuthor Vitae ; Nguyen Thi Minh Tuoi^bAuthor Vitae ; Nguyen Ngoc Toan^bAuthor Vitae ; Ho Truong Giang^b ; ^{gianght@ims.vast.ac.vn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Mixed potential gas sensors ; Solid electrolyte sensors ; Perovskite oxide electrodes
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：1 March 2016
• 年：2016
• 卷：224
• 期：Complete
• 页码：747-754
• 全文大小：3519 K

文摘

Gas-sensing performance of the electrochemical sensor utilized solid electrolyte of yttria-stabilized zirconia (YSZ) and metal-oxide sensing-electrode (SE) depends on electrochemical catalytic reaction at interface of metal-oxide/YSZ and heterogeneous gas-phase reaction through SE oxide. In this work, the mixed potential sensors with a configuration of Pt/YSZ/(Pt-LaFeO₃) sintered at the temperatures T_s = 700, 800, 900, 1050, 1200 and 1300 °C were investigated by exposing to various gases such as NO₂, NO, CO, C₃H₈ and CH₄ at the operating temperatures T_o = 450, 500, 550, 600 and 650 °C. All the sensors Pt/YSZ/(Pt-LaFeO₃) exhibited good sensitive and selective characteristics to NO₂ gas. Interesting characteristics on the gas sensing performances were obvious that the ΔV responses to NO₂ gas obtained the minimum and maximum values when the sensors Pt/YSZ/(Pt-LaFeO₃) sintered at the temperatures T_s = 900 and 1200 °C, respectively. Typically, the sensors exhibited decrease of NO₂ selectivity with increasing the sintering temperature T_s. The t₉₀ response-recovery times of the sensors were relatively complicated with the sintering temperature. Effect of the sintering temperatures of the Pt/YSZ/LaFeO₃ sensors on the gas sensing performances was also discussed in detail.