Preparation and performance of Rb+ doped La2Ce2O7-δ proton conductor for hydrogen permeation membranes

Compared with perovskite-type proton conductor materials, fluorite-type La2Ce2O7-δ has good tolerance to H2O and CO2, and is a promising candidate material for hydrogen permeation membranes. In this work, Rb+ doped La2Ce2O7-δ was proposed as a means to enhance both the hydrogen permeation flux and e...

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Published in:Journal of the European Ceramic Society 2025-02, Vol.45 (2), p.116867, Article 116867
Main Authors: Yang, Chunli, Li, Jun, Yao, Wei, Wang, Lei, Liang, Yanru, Wang, Kai, Yun, Sining
Format: Article
Language:English
Subjects:
Hydrogen penetration flux
Hydrogen separation membranes
La2-xRbxCe2O7-δ
Proton conductor
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Summary:Compared with perovskite-type proton conductor materials, fluorite-type La2Ce2O7-δ has good tolerance to H2O and CO2, and is a promising candidate material for hydrogen permeation membranes. In this work, Rb+ doped La2Ce2O7-δ was proposed as a means to enhance both the hydrogen permeation flux and electrochemical performance of La2Ce2O7-δ. Experimental findings indicate that the sample exhibits the highest conductivity and hydrogen permeation flux at a doping concentration of 15 % (La1.85Rb0.15Ce2O7-δ). Specifically, the hydrogen permeation flux of Pt-La1.85Rb0.15Ce2O7-δ increased by 1.5 times when the dry sweeping gas was replaced with wet sweeping gas during hydrogen permeation testing. It was observed that variations in membranes thickness resulted in distinct hydrogen permeation control mechanisms. Moreover, La2Ce2O7-δ samples doped with various concentrations of Rb+ exhibited excellent stability in a wet atmosphere containing 20 % CO2, suggesting their potential as ceramic hydrogen separation membranes materials.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2024.116867