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Effect of electrode material and design on sensitivity and selectivity for high temperature impedancemetric NOx sensors

Description: Solid-state electrochemical sensors using two different sensing electrode compositions, gold and strontium-doped lanthanum manganite (LSM), were evaluated for gas phase sensing of NO{sub x} (NO and NO{sub 2}) using an impedance-metric technique. An asymmetric cell design utilizing porous YSZ electrolyte exposed both electrodes to the test gas (i.e., no reference gas). Sensitivity to less than 5 ppm NO and response/recovery times (10-90%) less than 10 s were demonstrated. Using an LSM sensing el… more
Date: September 23, 2009
Creator: Woo, L. Y.; Glass, R. S.; Novak, R. F. & Visser, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Direct Carbon Fuel Cells: Assessment of their Potential as Solid Carbon Fuel Based Power Generation Systems

Description: Small-scale experimental work at Lawrence Livermore National Laboratory (LLNL) has confirmed that a direct carbon fuel cell (DCFC) containing a molten carbonate electrolyte completely reacts solid elemental carbon with atmospheric oxygen contained in ambient air at a temperature of 650-800 C. The efficiency of conversion of the chemical energy in the fuel to DC electricity is 75-80% and is a result of zero entropy change for this reaction and the fixed chemical potentials of C and CO{sub 2}. Th… more
Date: April 23, 2004
Creator: Wolk, R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High Efficiency Vapor-Fed AMTEC System for Direct Conversion. Final Report

Description: The Alkali Metal Thermal to Electric Converter (AMTEC) is a high temperature, high efficiency system for converting thermal to electrical energy, with no moving parts. It is based on the unique properties of {beta}{double_prime}-alumina solid electrolyte (BASE), which is an excellent conductor of sodium ions, but an extremely poor conductor of electrons. When the inside of the BASE is maintained at a higher temperature and pressure, a concentration gradient is created across the BASE. Electrons… more
Date: May 23, 1997
Creator: Anderson, W. G. & Bland, J. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Use of Microelectrodes in the Study of the Effects of Electrolyte Composition, Potential and Metallurgical Condition on Nucleation and Metastable Pitting of Stainless Steel 316

Description: The study of stainless steel 316 has been undertaken in electrolytes containing various concentrations of chloride (Cl{sup -}) and perchlorate (ClO{sub 4}{sup -}) ions. The concentration of Cl{sup -} and ClO{sub 4}{sup -} in these electrolytes varied between 0.025 and 0.1 M in a variety of combinations. Results showed that the total number of nucleation and metastable pitting events increased as [Cl{sup -}] and potential increased. However, the percentage propagation rate of metastable pits fro… more
Date: September 23, 2004
Creator: Ilevbare, G. O. & Burstein, G. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Use of Microelectrodes in the Study of the Effects of Electrolyte Composition, Potential and Metallurgical Condition on Nucleation and Metastable Pitting of Stainless Steel 316

Description: The study of stainless steel 316 has been undertaken in electrolytes containing various concentrations of chloride (Cl{sup -}) and perchlorate (ClO{sub 4}{sup -}) ions. The concentration of Cl{sup -} and ClO{sub 4}{sup -} in these electrolytes varied between 0.025 and 0.1 M in a variety of combinations. Results showed that the total number of nucleation and metastable pitting events increased as [Cl{sup -}] and potential increased. However, the percentage propagation rate of metastable pits fro… more
Date: September 23, 2004
Creator: Ilevbare, G. O. & Burstein, G. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High Efficiency Vapor-Fed AMTEC System for Direct Conversion. Appendices for Final Report

Description: This report consists of four appendices for the final report. They are: Appendix A: 700 C Vapor-Fed AMTEC Cell Calculations; Appendix B: 700 C Vapor-Fed AMTEC Cell Parts Drawings; Appendix C: 800 C Vapor-Fed AMTEC Cell Calculations; and Appendix D: 800 C Wick-Pumped AMTEC Cell System Design.
Date: May 23, 1997
Creator: Anderson, W. G. & Bland, J. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Novel Electrode Materials for Low-Temperature Solid-Oxide Fuel Cells

Description: Composites electrodes consisting of silver and bismuth vanadates exhibit remarkable catalytic activity for oxygen reduction at 500-550 C and greatly reduce the cathode-electrolyte (doped ceria) resistances of low temperature SOFCs, down to about 0.53 {omega}cm{sup 2} at 500 C and 0.21 {omega}cm{sup 2} at 550 C. The observed power densities of 231, 332, and 443 mWcm-2 at 500, 525 and 550 C, respectively, make it possible to operate SOFCs at temperatures about 500 C. Fuel cell performance depends… more
Date: March 23, 2005
Creator: Zha, Shaowu & Liu, Meilin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New Cathode Materials for Intermediate Temperature Solid Oxide Fuel Cells Quarterly Report: April-June 2004

Description: Operation of SOFCs at intermediate temperatures (500-800 C) requires new combinations of electrolyte and electrode materials that will provide both rapid ion transport across the electrolyte and electrode - electrolyte interfaces and efficient electrocatalysis of the oxygen reduction and fuel oxidation reactions. This project concentrates on materials and issues associated with cathode performance that are known to become limiting factors as the operating temperature is reduced. The specific ob… more
Date: July 23, 2004
Creator: Jacobson, Allan J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of Brazing Technology for Use in High- Temperature Gas Separation Equipment

Description: The development of high-temperature electrochemical devices such as oxygen and hydrogen separators, fuel gas reformers, solid oxide fuel cells, and chemical sensors is part of a rapidly expanding segment of the solid state technology market. These devices employ an ionic conducting ceramic as the active membrane that establishes the electrochemical potential of the device, either under voltage (i.e. to carry out gas separation) or under chemical gradient (to develop an electrical potential and … more
Date: April 23, 2003
Creator: Weil, K. S.; Hardy, J. S. & Kim, J. Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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