Journal article
Planar proton-conducting ceramic cells for hydrogen extraction: Mechanical properties, electrochemical performance and up-scaling
Solid State Chemistry, Department of Energy Conversion and Storage, Technical University of Denmark1
Department of Energy Conversion and Storage, Technical University of Denmark2
Continuum Modelling and Testing, Department of Energy Conversion and Storage, Technical University of Denmark3
Colorado School of Mines4
Proton-conducting ceramics, which selectively separate H2 from any hydrogen-containing gas could play a role in the future of the growing hydrogen market. In recent years, membrane technologies related to H2 extraction became attractive solutions to produce pressurized high-purity hydrogen. Yttrium-doped barium zirconate/cerate materials (BaCexZr1-x-yYyO3-δ) are among the most studied and used materials.
In this study, symmetrical cells consisting of a protonic electrolyte (BaCe0.2Zr0.7Y0.1O3-δ (BCZY27), 10‒15 μm in thickness) surrounded by two cermet electrodes (BCZY27–Ni (50‒50 vol.%), 150 μm) were prepared for H2 extraction applications. The cells were prepared via tape-casting and co-sintered at 1575 °C.
The cells were up-scaled to an area of 135 cm2. The fracture toughness of the cermet electrodes was determined to be 2.07 (±0.05) MPa∙m1/2 at room temperature using the double torsion technique. Impedance spectra were recorded on the symmetrical cells between 650 and 800 °C in 3% humidified 50% H2/50% N2 atmosphere and at 650 °C varying the hydrogen partial pressure (20% < pH2<100%).
In 50% H2/50% N2 with 3% H2O the cells demonstrated an ohmic resistance of 0.59 and 0.44 Ω cm,2 an average electrode polarization resistance of 0.10 and 0.09 Ω cm2 (per one electrode) at 650 and 800 °C, respectively. Moreover, a stability test was performed over 400 h highlighting the stable electrochemical properties of the symmetrical membranes.
Language: | English |
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Year: | 2022 |
Pages: | 6745-6754 |
ISSN: | 18793487 and 03603199 |
Types: | Journal article |
DOI: | 10.1016/j.ijhydene.2021.12.041 |
ORCIDs: | Pirou, Stéven , Wang, Qingjie , Khajavi, Peyman , Chen, Ming , Kiebach, Ragnar and 0000-0001-7565-0284 |