A mixed electronic and protonic conducting hydrogen separation membrane with asymmetric structure |
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| Authors: | Zhiwen Zhu Litao Yan Haowei Liu Wenping Sun Qingping Zhang Wei Liu |
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| Affiliation: | 1. CAS Key Laboratory of Materials for Energy Conversion, Department of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, PR China;2. Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA;3. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China |
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| Abstract: | In this work, highly doped ceria with lanthanum, La0.5Ce0.5O2−δ (LDC), are developed as hydrogen separation membrane material. LDC presents a mixed electronic and protonic conductivity in reducing atmosphere and good stability in moist CO2 environment. LDC separation membranes with asymmetrical structure are fabricated by a cost-saving co-pressing method, using NiO + LDC + corn starch mixture as substrate and LDC as top membrane layer. Hydrogen permeation properties are systemically studied, including the influence of operating temperature, hydrogen partial pressure in feed stream and water vapor in both sides of the membrane on hydrogen permeating fluxes. Hydrogen permeability increases as the increasing of temperature and hydrogen partial pressure in feed gas. Using 20% H2/N2 (with 3% of H2O) as feed gas and dry high purity argon as sweep gas, an acceptable flux of 2.6 × 10−8 mol cm−2 s−1 is achieved at 900 °C. The existing of water in both sides of membrane has significant effect on hydrogen permeation and the corresponding reasons are analyzed and discussed. |
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| Keywords: | Hydrogen separation La0 5Ce0 5O2&minus δ Fluorite structure Mixed electronic and protonic conductor |
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