Abstract
The prominence of hydrogen energy has brought membrane separation technology to forefront attention. La2Ce2O7, possessing a fluorite structure, exhibits notable stability in both H2O and CO2, rendering it a prospective material for membrane separation. The impact of Sr doping on the electrochemical characteristics of La2Ce2O7 was systematically investigated. The findings indicate that a minor addition of Sr2+ through doping enhances the electrical conductivity, with the most significant improvement observed in La2-xSrxCe2O7-δ (x = 0, 0.05, 0.15, 0.30) when doped by 0.05. Elevated temperature and increased hydrogen partial pressure on the feed side enhance hydrogen permeability. Hydrogen permeation is predominantly governed by bulk diffusion when the membrane thickness exceeds 0.59 mm, while for thicknesses below 0.49 mm, the process is influenced by both surface and bulk diffusion. Moreover, the doped La2Ce2O7 exhibit commendable stability in H2O and CO2 environments. Consequently, La2Ce2O7 emerges as a promising candidate for ceramic hydrogen separation membranes.
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