Acceleration of the aging process of YSZ-based H₂ sensor using Zn-Ta-O sensing-electrode

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• 作者：Sri Ayu AnggrainiAuthor Vitae ; Hiroshi IkedaAuthor Vitae ; Norio Miura ; ^{miurano@astec.kyushu-u.ac.jp" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Hydrogen ; Gas sensor ; Mixed potential ; YSZ ; ZnO ; Ta2O5
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：223
• 期：Complete
• 页码：738-742
• 全文大小：719 K

文摘

An yttria-stabilized zirconia (YSZ)-based sensor using Zn–Ta-based oxide as a sensing electrode (SE) has been previously reported to generate a highly sensitive and selective response to hydrogen (H₂) after the aging of 40 days at 500 °C. This study is focused on shortening such a long aging time (stabilization) for obtaining the high-performance of the sensor. Initially, different heat treatments (changing the sintering parameter and the aging temperature) were done and could not give satisfactory results. However, when the sensor was exposed to 400 ppm H₂ in N₂ (the H₂ treatment), the stabilization time was found to decrease from 40 to 24 days. Prolongation of the H₂-treatment time from 30 to 60 min helped the sensor using Zn–Ta–O-SE to reach the stabilized level in 15 days. Extending the treatment time up to 120 min gave an adverse effect to the shortening of stabilization time. Furthermore, the sensing performance of the stabilized sensor received the 400 ppm H₂ treatment for 60 min was unaffected by this H₂ treatment, since the sensor was still able to exhibit likewise highly sensitive and selective response to H₂ after the stabilized state was achieved.