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000887857 1001_ $$0P:(DE-Juel1)180798$$aLeonard, kwati$$b0$$eCorresponding author
000887857 245__ $$aProcessing Ceramic Proton Conductor Membranes for Use in Steam Electrolysis
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000887857 520__ $$aSteam electrolysis constitutes a prospective technology for industrial-scale hydrogen production. The use of ceramic proton-conducting electrolytes is a beneficial option for lowering the operating temperature. However, a significant challenge with this type of electrolyte has been upscaling robust planar type devices. The fabrication of such multi-layered devices, usually via a tape casting process, requires careful control of individual layers’ shrinkages to prevent warping and cracks during sintering. The present work highlights the successful processing of 50 × 50 mm2 planar electrode-supported barium cerium yttrium zirconate BaZr0.44Ce0.36Y0.2O2.9 (BZCY(54)8/92) half cells via a sequential tape casting approach. The sintering parameters of the half-cells were analyzed and adjusted to obtain defect-free half-cells with diminished warping. Suitably dense and gas-tight electrolyte layers are obtained after co-sintering at 1350 °C for 5 h. We then assembled an electrolysis cell using Ba0.5La0.5CoO3−δ as the steam electrode, screen printed on the electrolyte layer, and fired at 800 °C. A typical Ba0.5La0.5CoO3−δ|BaZr0.44Ce0.36Y0.2O3−δ(15 μm)|NiO-SrZr0.5Ce0.4Y0.1O3−δ cell at 600 °C with 80% steam in the anode compartment reached reproducible terminal voltages of 1.4 V @ 500 mA·cm−2, achieving ~84% Faradaic efficiency. Besides electrochemical characterization, the morphology and microstructure of the layered half-cells were analyzed by a combination of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and energy-dispersive X-ray spectroscopy. Our results also provide a feasible approach for realizing the low-cost fabrication of large-sized protonic ceramic conducting electrolysis cells (PCECs)
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000887857 7001_ $$0P:(DE-Juel1)144923$$aDeibert, Wendelin$$b1$$ufzj
000887857 7001_ $$0P:(DE-Juel1)129617$$aIvanova, Mariya E.$$b2$$ufzj
000887857 7001_ $$0P:(DE-Juel1)129637$$aMeulenberg, Wilhelm A.$$b3$$ufzj
000887857 7001_ $$0P:(DE-HGF)0$$aIshihara, Tatsumi$$b4
000887857 7001_ $$0P:(DE-HGF)0$$aMatsumoto, Hiroshige$$b5
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