Thickness dependence of hydrogen permeability for Ni-BaCe{sub 0.8}Y{sub 0.2}O{sub 3-{delta}}.
Journal Article
·
· Solid State Ionics
The hydrogen separation properties and thickness dependence of the hydrogen flux for Ni-BCY membranes, containing a proton-conductor (BaCe{sub 0.8}Y{sub 0.2}O{sub 3-{alpha}}, i.e., BCY) and an electron-conductor (Ni metal), were studied as a function of temperature in the thickness range of 0.08-1.16 mm. Feed gas was composed of 3.8% H{sub 2} balanced with He (pH{sub 2}O = 0.03 atm) gas and sweep gas contained 100 ppm hydrogen balanced with nitrogen. The hydrogen permeation flux due to ambipolar diffusion dominates over the entire experimental temperature range, but the hydrogen permeation flux through the Ni-metal increases with temperature due to its endothermic hydrogen solubility. The hydrogen flux through the Ni-BCY membranes is inversely proportional to the thickness, indicating that bulk diffusion is the rate limiting step down to a thickness of 80 {micro}m. For thicker (> 640 {micro}m) membranes, the flux decreases monotonically as the temperature increases up to 900 C, whereas the flux for thinner (< 200 {micro}m) membranes increases as temperature increases up to {approx} 750 C and then remains nearly constant as the temperature is further increased.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- FE
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 990157
- Report Number(s):
- ANL/ES/JA-62437
- Journal Information:
- Solid State Ionics, Journal Name: Solid State Ionics Journal Issue: 3-4 ; Oct. 2008 Vol. 179; ISSN 0167-2738
- Country of Publication:
- United States
- Language:
- ENGLISH
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