Novel Composite Cermet for Low-Metal-Content Oxygen Separation Membranes
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- 作者：Enrique Ruiz-Trejo ; Paul Boldrin ; Alexandra Lubin ; Farid Tariq ; Sarah Fearn ; Richard Chater ; Stuart N. Cook ; Alan Atkinson ; Robert I. Gruar ; Christopher J. Tighe ; Jawwad Darr ; Nigel P. Brandon
- 刊名：Chemistry of Materials
- 出版年：2014
- 出版时间：July 8, 2014
- 年：2014
- 卷：26
- 期：13
- 页码：3887-3895
- 全文大小：505K
- ISSN：1520-5002
文摘
A dense composite of silver and Ce0.8Sm0.2O2鈭捨?/sub> (Ag-CSO) was manufactured from ceramic nanoparticles coated by electroless deposition of silver. At 700 掳C, a 1-mm-thick membrane of the composite delivered an excellent oxygen permeation rate from air with a value of 0.04 渭mol cm鈥? s鈥?, using argon as the sweep gas and 0.17 渭mol cm鈥? s鈥? using hydrogen. The low sintering temperature of the CSO nanoparticles allows the use of Ag rather than Pt or Pd and reduces the amount of metal needed for electronic conductivity to just 5.6 vol %, which is lower than any value reported in the literature. Oxygen diffusivity measurements confirmed that the oxygen migration remained high in the composite, with an increase in surface exchange coefficient of three orders of magnitude over Gd-doped ceria. The ease of membrane fabrication, combined with encouraging oxygen permeation rates, demonstrate the promise of the material for high-purity oxygen separation below 700 掳C.