lohafindmy.blogg.se - 2018 north ba ycal fire

We focused on a well-established, low cost, sequential tape casting processing route to address some of these challenges. A convenient, cost-effective processing method is thus needed to produce a desirable electrolyte/electrode interface microstructure and defect-free (without cracks, pinholes) thin electrolyte layer for better cell performance. showed that over-grown NiO particles at the electrode interface tend to prevent a favorable microstructure at the electrolyte/electrode interface that contributes to the electrode reaction. Typically, for the successful fabrication of such devices with a relatively thin electrolyte layer, the fuel side electrode’s microstructural integrity is critical because its surface crucially affects the thin electrolyte layer’s quality. Nonetheless, even with such a good performance, the investigated cells’ microstructure still requires significant optimization. They also observe stable long term operation and limited degradation rate (−2%/kh). In their study, an impressive cell performance on a 4.5 × 4.5 cm 2 cell is reported under both fuel (>0.25 W /cm 2, 0.7 V) and electrolysis mode (0.5 A/cm 2, 1.3 V). Dailly and Marrony reported on planar-type proton-conducting electrolyte cells with an active working area of ~12–20 cm 2. In recent years, various efforts to develop cost-effective processing techniques for large-sized protonic cells have somewhat advanced. The improved cell performance was explained by the electrolyte’s high densification promoted by a better sinter-ability of NiO-SrZr 0.5Ce 0.4Y 0.1O 3−δ cathode substrate. This class of electrolytes is particularly favored for their relatively high ionic conductivity with low activation energy (82% using BaZr 0.44Ce 0.36Y 0.2O 3−δ as the electrolyte. Steam electrolysis has been demonstrated to be an efficient and viable method to produce high purity hydrogen using ceramics proton-conducting electrolytes (PCE) at the intermediate temperature range (400~600 ☌). Our results also provide a feasible approach for realizing the low-cost fabrication of large-sized protonic ceramic conducting electrolysis cells (PCECs). 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.

cm −2, achieving ~84% Faradaic efficiency.

A typical Ba 0.5La 0.5CoO 3−δ|BaZr 0.44Ce 0.36Y 0.2O 3−δ(15 μm)|NiO-SrZr 0.5Ce 0.4Y 0.1O 3−δ cell at 600 ☌ with 80% steam in the anode compartment reached reproducible terminal voltages of 1.4 V 500 mA We then assembled an electrolysis cell using Ba 0.5La 0.5CoO 3−δ as the steam electrode, screen printed on the electrolyte layer, and fired at 800 ☌. Suitably dense and gas-tight electrolyte layers are obtained after co-sintering at 1350 ☌ for 5 h. The sintering parameters of the half-cells were analyzed and adjusted to obtain defect-free half-cells with diminished warping. The present work highlights the successful processing of 50 × 50 mm 2 planar electrode-supported barium cerium yttrium zirconate BaZr 0.44Ce 0.36Y 0.2O 2.9 (BZCY(54) 8/92) half cells via a sequential tape casting approach. 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. However, a significant challenge with this type of electrolyte has been upscaling robust planar type devices. The use of ceramic proton-conducting electrolytes is a beneficial option for lowering the operating temperature. Steam electrolysis constitutes a prospective technology for industrial-scale hydrogen production.