PDF Publication Title:
Text from PDF Page: 129
Chapter 5. Aspects of Metal-YSZ Electrode Kinetics 108 5. Aspects of Metal-YSZ Electrode Kinetics A better understanding of the electrochemistry that takes place at the metal-YSZ electrode- electrolyte interface would help in identifying ways to improve solid oxide cell performance, both from the standpoints of understanding the mechanisms that limit performance and cause it to degrade and of designing new and improved negative-electrodes (YSZ = yttria stabilized zirconia). This chapteri presents an experimental study of the electrode kinetics of oxidation and reduction of H2/H2O and CO/CO2 at the metal/YSZ interface in gas compositions relevant to fuel cell and electrolysis cell operation (e.g. including 50% H2 + 50% H2O and 50% CO + 50% CO2), using point-contact metal wire electrodes to form cells with simplified geometry. This simple geometry is useful to obtain a well-defined interface and isolate the true nature of the electrochemistry from the additional properties that arise from a complex three-dimensional microstructure in a porous solid oxide cell electrode. Impedance spectra were measured at open-circuit voltage and under polarization, and polarization sweeps were performed. Test conditions – the gas composition, the temperature, and the polarization of the electrodes – were varied systematically to examine how the electrochemical measurements varied, to facilitate studying the electrode rate-limiting processes. In addition to applying conditions relevant to electrolysis of H2O and of CO2 (e.g. high pH2O and pCO2, and cathodic polarization), an additional parameter uncommon in most prior studies was the variation of the metal material itself – by comparing the same reactions using different metals (Ag, Au, Cu, Ni, Pd, and Pt) under identical conditions, the similarities and differences of the electrochemical responses between the different metals revealed more information about the reactions than a single material would have. Several extreme conditions were also applied to the electrodes causing temporary phase changes, including oxidation by exposure to oxygen followed by re-reduction to metal by hydrogen, and strong cathodic polarization which is known to partially reduce the zirconia – both cases resulted in activation of the electrodes, improving performance by as much as an i Part of this chapter has been published in modified form as: Graves, C., S.D. Ebbesen, and M. Mogensen, Aspects of Metal-YSZ Electrode Kinetics Studied using Model Electrodes. ECS Transactions, 2009. 25(2): p. 1945-1955 Chapter 5PDF Image | Electrolysis of CO2 and H2O
PDF Search Title:
Electrolysis of CO2 and H2OOriginal File Name Searched:
co2-hso-fuels.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |