Solid Oxide Fuel Cells Developed by the Sol-Gel Process for Oxygen Generation

摘要: Electrochemical fuel cells convert chemical energy directly to electrical through the reaction of a and an oxidant. Solid oxide (SOFC) are solid-state devices that operate at temperatures around 800oC, using solid oxygen electrolyte. The goal this thesis is prepare defect-free electrolyte by sol-gel process capable (a) functioning in cell (b) producing measurable when operated as generator. Sol-gel processing was chosen for membrane development because it offers means applying high-purity layers with controlled doping variety geometries. In study, used produce yttria-stabilized zirconia (YSZ) membranes well electrodes required operational cell. Zirconium oxychloride (ZOC) precursor material YSZ solution prepared mixing yttrium nitrate ZOC 50/50 ETOH water solvent. catalyzed 1.5M NH4OH. Viscosity application techniques were varied monitor effect on development. layer sintered full density. The synthesize supported lanthanum strontium manganate (LSM) separated LSM made nitrate, chloride, manganese acetate solutions. but porous. After assembled successive layering sintering, completed characterized TGA, XRD, FE-SEM, gas pressurization technique, electrochemical testing. The exhibited stable tetragonal crystal phase formed triple boundary (TPB) cathode. three phases electrode, electrolyte, air. testing showed successful Although production not measured quantitatively, voltage produced during hydrogen testing. A maximum 0.352V obtained forming fuel. relationship between TPB critical. By process, possible form where dense.%%%%