temperatures, typically between 500 and 1,000C. A priority for research in solid oxide fuel cells (sofcs) is to develop cells that can maintin adequate performance in sulfur-containing fuel streams. Document Type and Number: wipo Patent Application WO/2013/069633, kind Code: A1, abstract: The present invention improves durability of a solid-oxide fuel-cell (sofc) system and secures good electricity-generating performance during system use. Concentration Polarization, the concentration polarization is the result of the finite gas diffusion processes that govern movement of the gases into and out of the electrochemical reaction. A single cell consisting of these four layers stacked together is typically only a few millimeters thick.
This enables efficiency to reach as much as 85 in these hybrid systems, called combined heat and power (CHP) device. Another way to decrease ohmic resistance is to decrease the thickness of the electrolyte layer.6. Edu/ Website for the High Temperature Electro-chemistry Center * t/ Solid Cell Inc. This allows sofcs to operate on a wide variety of different fuels such as methane, propane, butane, natural gas, fermentation gas, gasified biomass and paint fumes. Research Research is going now in the direction of lower-temperature sofc (600C) in order to decrease the materials cost, which will enable the use of metallic materials with better mechanical properties and thermal conductivity. The most common intermetallic materials used today are doped lanthanum chromites. The most common material used is a cermet made up of nickel mixed with the ceramic material that is used for the electrolyte in that particular cell, typically YSZ (yttria stabilized zirconia). In this reaction, a water byproduct is given off as well as two electrons.
A high-temperature sofc will generate all of the needed electricity to allow the engine to be smaller and more efficient. Anode, the ceramic anode layer must be very porous to allow the fuel to flow towards the electrolyte. For the first time, the charge density distributions have been studied in these materials as synthesized by high temperature solid state reaction. The larger the length, the more reactions can occur and thus the less the activation polarization.
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