A5027212569- Advancements in Solid Oxide Fuel Cells
- Electronic and Structural Properties of Oxides
- Fuel Cells and Related Materials
- Magnetic and transport properties of perovskites and related materials
- Molten salt chemistry and electrochemical processes
- Thermal Expansion and Ionic Conductivity
- Nuclear Materials and Properties
- Electrocatalysts for Energy Conversion
- Advanced materials and composites
- Advanced battery technologies research
- Catalytic Processes in Materials Science
- Advanced Battery Materials and Technologies
- Catalysis and Oxidation Reactions
- Advancements in Battery Materials
- Advanced Combustion Engine Technologies
- Transition Metal Oxide Nanomaterials
- Metal Extraction and Bioleaching
- Advanced ceramic materials synthesis
- Electron and X-Ray Spectroscopy Techniques
- Advanced Battery Technologies Research
- Nuclear reactor physics and engineering
- Biodiesel Production and Applications
- Semiconductor materials and devices
- Nuclear materials and radiation effects
- Coal Combustion and Slurry Processing
Pacific Northwest National Laboratory
2012-2023
Battelle
2007-2020
Richland College
2008-2010
Washington State University Tri-Cities
1994
The performance of several negative (fuel) and positive (air) electrode compositions for use in reversible solid oxide fuel cells capable operating both as a cell an electrolyzer was investigated half-cell full-cell tests. Negative studied were nickel/zirconia cermet lanthanum-substituted strontium titanate/ceria composite, whereas examined included mixed ion- electron-conducting lanthanum ferrite (LSF), copper , cobalt manganite (LSM). While electrodes performed similarly the mode tests,...
Subjects judged the values of lotteries from 3 points view: highest price that a buyer should pay, lowest seller accept, and fair price. The rank order judgments changed as function point view. Data also showed violations branch independence monotonicity (dominance). These findings pose difficulties for nonconfigural theories decision making, such subjective expected utility theory, but can be described by configural-we ight theory. Configural weighting is similar to rank-dependen t except...
This paper investigates sintering and phase transitions of La 0.7 CaxCrO 3 (0.25≥x≥0.35), a material useful as electrical interconnections in solid oxide fuel cells. Heating the quenched, metastable single‐phase chromite resulted exsolution CaCrO 4 due to Ca solubility limitations below 1200°C. A transient liquid formed between 850° 1000°C melted, causing partial densification materials having 0.25 < x 0.30. slight increase content induced an additional liquid‐phase event, likely melting...
Sodium-beta batteries (NBBs), which are typically constructed on a thick tubular electrolyte and operate at relatively high temperatures, have number of disadvantages such as capital cost performance/safety issues that limit market penetration the technology. In this work we report new generation NBB utilizes planar design. The design allows for thinner reduces area specific resistance may be operated reduced temperatures. lower operating temperatures would alleviate adverse temperature...
Two parallel pathways have been identified for oxygen reduction and evolution on mixed ionic electronic conductors (MIECs). Charge transfer may proceed by reaction at the triple-phase boundary to consume or produce adsorbed surface of MIEC. Alternatively, charge with vacancies holes from bulk MIEC subsequent exchange purely conducting electrolyte. A continuum mass-transport model is developed describing competition between these two charge-transfer pathways. Key treatment condition...
We explore the use of plasmonic Ag nanorod arrays featuring enhanced photoemission as high-brightness photocathode material. Silver are synthesized by direct current electrodeposition method and their dimensionality, uniformity, crystallinity, oxide/impurity content characterized. The yielded exhibit greatly two-photon under 400 nm femtosecond pulsed laser excitation. Plasmonic field enhancement in array produces hot spots that mapped using electron microscopy. relative to a flat thin film...
Electrical, thermoelectric, and structural properties were studied in transition metal ion-substituted : , . Structural analysis showed that a continuous series of solid solutions with no intermediate phases are forming over wide range substitutions Mn Ni, whereas the maximum Cu content is 30% from this study. The Ni-substituted specimens have substantially higher conductivity than those substituted either or Cu, measured air Seebeck coefficient has strong temperature dependence, indicating...
The structural, thermal, and electrical characteristics of calcium- cobalt-doped yttrium chromites were studied for potential use as interconnect material in high temperature solid oxide fuel cells well other electrochemical thermoelectric devices. compositions formed single-phase orthorhombic perovskite structures a wide range oxygen pressures. Sintering behavior was remarkably enhanced result cobalt substitution chromium, densities 95 97% theoretical density obtained after sintering at...
Nonstoichiometries of and transport properties were investigated. At , transformed to CaO CoO. The reaction products offer a precise baseline for thermogravimetric analysis. room temperature, δ in is 0.38, which decreases at indicating the onset point formation oxygen vacancies, . Correspondingly, average Co valence state 3.19 temperature 3.10 In contrast conventional defect chemistry theory p-type oxide conductors, vacancies has negligible impact on carrier density holes, that redox couple...
Performance of solid oxide fuel cell (SOFC) with nickel/zirconia anodes on synthetic coal gas in the presence low levels phosphorus, arsenic, selenium, sulfur, hydrogen chloride, and antimony impurities were evaluated. The phosphorus arsenic led to slow irreversible SOFC degradation due formation secondary phases nickel, particularly close inlet. Phosphorus surface adsorption layers identified as well. Hydrogen chloride sulfur interactions nickel limited only, whereas selenium exposure also...
The reduction of oxygen on nickel-doped lanthanum strontium ferrite was studied by current interrupt cyclic voltammetry. Nickel doped the B site perovskite ranged from 0 to 40%. strongly influenced sintering films. minimum temperature at which a stable adherent robust film could be formed increased with nickel content. electrochemical performance for compared Undoped consistently showed greater activity than materials. data were further analyzed obtain exchange density as function and then...
Exposure of (La 0.90 Sr 0.10 ) 0.98 MnO 3+δ (LSM‐10) to repeated oxygen partial pressure cycles (air/10 ppm O 2 resulted in enhanced densification rates, similar behavior shown previously due thermal cycling. Shrinkage rates the temperature range 700°–1000°C were orders magnitude higher than Makipirtti–Meng model estimations based on stepwise isothermal dilatometry results at a high temperature. A maximum shrinkage cycling occurred 900°C. was greatest when LSM‐10 bars that first equilibrated...