Preparation of dual-phase composite BaCe_0.8Y_0.2O₃/Ce_0.8Y_0.2O₂ and its application for hydrogen permeation

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• 作者：Yongguang Liu^a ; ^b ; Lei Dai^a ; ^b ; ^{dailei_b@163.com" class="auth_mail" title="E-mail the corresponding author} ; Wenjing Zhang^a ; Huizhu Zhou^a ; Yuehua Li^a ; Ling Wang^a ; ^b ; ^{tswling@126.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：C. Electrical conductivity ; BaCe0.8Y0.2O3 ; Ce0.8Y0.2O2 ; Dual phase composite ; Hydrogen permeation
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：42
• 期：5
• 页码：6391-6398
• 全文大小：1612 K

文摘

Dual-phase ceramic membranes composed of BaCe_0.8Y_0.2O₃ (BCY) and Ce_0.8Y_0.2O₂ (CYO) were successfully synthesized by solid state reaction method for hydrogen permeation. The influences of the BCY/CYO volume ratios on phase composition, microstructure, chemical stability and electrical property were investigated. The hydrogen permeation of the dual-phase composite was characterized as a function of temperature and feed side hydrogen partial pressure. The results showed that there was no reaction between the two constituent oxides observed under the preparation conditions. The dual-phase composite with different BCY/CYO volume ratios after sintering at 1550 °C exhibited dense structure, as well as good stability in 4% H₂/Ar, wet Ar and pure CO₂ atmosphere. The conductivity of the dual-phase composite increased with the content of CYO increasing and 30BCY–70CYO exhibited the highest total conductivity of 2.6×10⁻² S cm⁻¹ at 800 °C in 4% H₂/Ar. The hydrogen permeability of 30BCY–70CYO sample was improved as the temperature and the hydrogen partial pressure in feed gas increased. The hydrogen permeation flux of 1.7 μmol cm⁻² s⁻¹ was achieved at 850 °C.