Abstract
Lanthanum tungstate (La6WO12) is a promising material for the development of hydrogen separation membranes, proton ceramic electrolyzer cells and protonic ceramic fuel cells due to its interesting transport properties and stability under different operation conditions. In order to improve the hydrogen transport through the La6WO12 membranes, thin membranes should be manufactured. This work is based on the industrial production of La5.5WO11.25−δ (LWO) powder by spray drying and the manufacturing of thin membranes by low-pressure plasma spraying (LPPS-TF) technique. LPPS-TF allows the production of dense thin films of high quality in an industrial scale. The powders produced by spray drying were morphological and electrochemically characterized. Hydrogen permeation fluxes of a membrane manufactured with these powders were evaluated and fluxes are similar to those reported previously for LWO powder produced in the lab scale. Finally, the transport properties of LWO thin films deposited on Al2O3 indicate that LPPS-TF produces high-quality LWO films with potential for integration in different applications.
Highlights
IntroductionProtonic conductors (pure and mixed protonic-electronic) have focused the attention of different scientific groups due to their interesting application as hydrogen-selective membranes, electrolysers, fuel cells and catalytic membrane reactors at high temperatures (>400 ◦ C) [1,2,3,4]
In the last years, protonic conductors have focused the attention of different scientific groups due to their interesting application as hydrogen-selective membranes, electrolysers, fuel cells and catalytic membrane reactors at high temperatures (>400 ◦ C) [1,2,3,4]
Spray-dried LWO powders used for thin film deposition by LPPS-TF were manufactured in a
Summary
Protonic conductors (pure and mixed protonic-electronic) have focused the attention of different scientific groups due to their interesting application as hydrogen-selective membranes, electrolysers, fuel cells and catalytic membrane reactors at high temperatures (>400 ◦ C) [1,2,3,4]. The selection of the material for hydrogen permeable membranes based on oxides follows the criteria: (1) hydrogen permeability, which is related to the ambipolar conductivity of the oxide; (2) stability in harsh gas environments, i.e., reducing environments containing high. Lanthanide tungstates (Ln6WO12) partly fulfil these requirements, i.e., (1) they present remarkable H2 flows and infinite permselectivity [5,6,7], (2) the stability in CO2 containing atmospheres and under H2S at ppm level [8,9,10] has been demonstrated and (3) the molecular formula presents some flexibility in(Ln the WO ratio12Ln/W [11,12]. H. 2 flows and infinite permselectivity [5,6,7], (2) the stability in CO2 containing atmospheres and under
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