Tuning the separation performance of hydrogen permeable membranes using an anion doping strategy

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2017, Vol.5 (38), p.2482-249
• Main Authors: Chen, Li, Zhuang, Libin, Xue, Jian, Wei, Yanying, Wang, Haihui
• Format: Article
• Language: English
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/c7ta06030k

Overcoming the dilemma between hydrogen permeability and stability is critical for realizing the widespread application of mixed protonic-electronic conducting (MPEC) membranes. Herein, fluoride-anion doping is for the first time reported for tuning the separation performance of MPEC membranes. Lanthanum tungstate oxyfluoride membranes, La 5.5 W 0.6 Mo 0.4 O 11.25− δ F x ( x = 0, 0.025, 0.05, 0.10, 0.20, 0.50), exhibit improved hydrogen permeability and enhanced stability compared to their parent oxides, achieving a maximum value of 0.20 mL min −1 cm −2 at x = 0.05. Moreover, the declining hydrogen permeability performance of lanthanum tungstate MPEC membranes during high-temperature operation was systematically analyzed and relative solutions are put forward. The anion-doping and stability-improving strategies might accelerate the development and future practical applications of MPEC membranes. Fluoride-anion doping is first reported for tuning the separation performance of mixed protonic-electronic conducting (MPEC) membranes, and enhanced hydrogen permeability was observed with appropriate introduction of the fluoride ions.