Planar proton-conducting ceramic cells for hydrogen extraction: Mechanical properties, electrochemical performance and up-scaling. (1st February 2022)

• Record Type: Journal Article
• Authors: Pirou, Stéven; Wang, Qingjie; Khajavi, Peyman; Georgolamprou, Xanthi; Ricote, Sandrine; Chen, Ming; Kiebach, Ragnar
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 10(2022)
• Page Start: 6745
• Page End: 6754
• Publication Date: 2022-02-01
• Subjects: Proton-conducting ceramics -- Tape-casting -- BCZY -- H2 production -- Mechanical properties; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.12.041
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: 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 (BaCex Zr1-x-y Yy O3-δ ) are among the most studied and used materials. In this study, symmetrical cells consisting of a protonic electrolyte (BaCe0·2 Zr0·7 Y0·1 O3-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 cm 2 . The fracture toughness of the cermet electrodes was determined to be 2.07 (±0.05) MPa · m 1/2 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% H2 O 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 cm 2 (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. Graphical abstract: Image 1 Highlights: The study showed promising results for large-scale development of efficient PCC 1 cells. Microstructural stability of BCZY27 2 based cells were studied. BCZY27 based protonic membranes were up-scaled to an area of 135 cm 2 . The fracture toughness of BCZY27-Ni was studied by double torsion for the first time. An electrochemical stability test performed over 400 h showed stable performances.