WorldCat Identities

Haile, Sossina M.

Overview
Works: 33 works in 50 publications in 1 language and 116 library holdings
Genres: Interviews  Internet videos  Oral histories  Academic theses 
Roles: Author, Thesis advisor
Classifications: E185.97, 973.04960730092
Publication Timeline
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Most widely held works by Sossina M Haile
The HistoryMakers video oral history with Sossina Haile( Visual )

1 edition published in 2016 in English and held by 43 WorldCat member libraries worldwide

Engineer and professor Sossina Haile was born on July 28, 1966 in Ethiopia. She attended Massachusetts Institute of Technology where she received her B.S. degree in 1986. She went on to receive her M.S. degree from the University of California, Berkeley and her Ph.D. degree from Massachusetts Institute of Technology in 1992. While in school, Haile received the AT&T Cooperative Research Fellowship and a Fulbright Fellowship. Upon receiving her Ph.D. degree, Haile was hired as an assistant professor at the University of Washington, Seattle where she remained until 1996 when she joined the faculty at the California Institute of Technology. Haile became well-known for her work at CIT. In the 1990s, she fabricated the first solid-acid fuel cell in her lab, regarded as a gateway to more powerful, commercial cells. Haile’s work was supported by the National Science Foundation among numerous others. Haile received the Chemical Pioneer Award of the American Institute of Chemists
Novel composite membranes for fuel cells : feasibility analysis by Sossina M Haile( )

4 editions published in 2003 in English and held by 22 WorldCat member libraries worldwide

Enhanced Power Stability for Proton Conducting Solid Oxides Fuel Cells. Calculated energy barriers for proton diffusion in Y-doped BaZrO3. Potential electrode materials for application in proton ceramic fuel cells( )

1 edition published in 2005 in English and held by 5 WorldCat member libraries worldwide

A series of Quantum Mechanical (QM) calculations on Y-doped BaZrO{sub 3} (BYZ) periodic structures have been performed and calculated energy barriers for the intra-octahedra and inter-octahedra proton transfer have been found. The inter-octahedra proton transfer dominates in the BYZ electrolyte. Several potential cathode materials for the Y-doped BaZrO{sub 3} system were synthesized via glycine nitrate combustion method. Of the five potential cathode materials examined BaZr{sub 0.40}Pr{sub 0.40}Gd{sub 0.20}O{sub 3} and BaZr{sub 0.60}Y{sub 0.20}Co{sub 0.20}O{sub 3} appear to be the most promising for further applications in proton ceramic fuel cells (PCFCs). Potential anode electrocatalysts (metals) have been screened for reactivity with BaZr{sub 1-x}Y{sub x}O{sub 3-d}, fabrication compatibility, and chemical stability in fuel cell environment
COMPUTATIONAL MODELING, SYNTHESIS, AND CHARACTERIZATION OF BaZr1-xYxO3-8 SOLID STATE PROTON CONDUCTOR( )

1 edition published in 2003 in English and held by 5 WorldCat member libraries worldwide

During the second semiannual period we have carried out a series of QM calculations on the BaZr{sub 1-x}Y{sub x}H{sub x}O{sub 3} proton conductor to determine the equilibrium proton positions and corresponding energies. We find that the size of the crystal cell is very important for the identification of the equilibrium proton positions. To derive ReaxFF parameters for Pt-surfaces and for H-transfer in Y-doped BaZrO{sub 3}, we carried out QM-calculations on the structures and energies of relevant condensed phases and cluster systems. These data then served as a training set to optimize the ReaxFF parameters. ReaxFF for various bulk metals (Pt, Zr, and Y) and metal clusters (Pt) was developed. BaZr{sub 1-x}Y{sub x}O{sub 3-{delta}} with x = 0.2, 0.3, 0.4, 0.5 was synthesized using a modified Pechini method and characterization (X-ray diffraction, scanning electron microscopy, and impedance spectroscopy) of this material was performed. We find that a single perovskite phase is formed in BaZr{sub 1-x}Y{sub x}O{sub 3-{delta}}. The proton conductivity of BaZr{sub 1-x}Y{sub x}O{sub 3-{delta}} with x = 0.5 is significantly lower than the conductivity of the samples with Y-dopant concentrations of 0.1 and 0.2
REACTIVE FORCE FIELDS FOR Y-DOPED BaZrO3 ELECTROLYTE AND NI-ANODE. POTENTIAL CATHODE MATERIALS FOR APPLICATION IN PROTON CERAMIC FUEL CELLS( )

1 edition published in 2004 in English and held by 5 WorldCat member libraries worldwide

Based on quantum mechanical data obtained for the Y-doped BaZrO{sub 3} electrolyte and Ni-anode Reactive Force Field parameters have been developed for further molecular dynamics simulations of the proton diffusion and electrode/electrolyte interfaces. Electronic and atomic structures of different terminations of the (001) BaZrO{sub 3} surface have been studied using first-principles calculations. Several potential cathode materials for the Y-doped BaZrO{sub 3} system were synthesized via glycine nitrate combustion method. Of the five potential cathode materials examined BaZr{sub 0.40}Pr{sub 0.40}Gd{sub 0.20}O{sub 3} and BaZr{sub 0.60}Y{sub 0.20}Co{sub 0.20}O{sub 3} appear to be the most promising for further applications in proton ceramic fuel cells. Fuel cell test of a Y-doped BaZrO{sub 3} thin film using platinum ink for both electrodes have been performed. The obtained results shows that a robust method for fabricating crack-free thin membranes, as well as methods for sealing anode and cathode chambers, have successfully been developed
Vitrification as a method of preserving organs by Sossina M Haile( )

2 editions published in 1988 in English and held by 4 WorldCat member libraries worldwide

Synthesis, crystal structure, and ionic conductivity of some alkali rare earth silicates by Sossina M Haile( Book )

3 editions published between 1992 and 1993 in English and held by 3 WorldCat member libraries worldwide

Atomistic simulations of barium titanate by Qingsong Zhang( Book )

1 edition published in 2005 in English and held by 2 WorldCat member libraries worldwide

Solid Acid Based Fuel Cells( Book )

2 editions published in 2005 in English and held by 2 WorldCat member libraries worldwide

High power density fuel cells based on solid acid electrolytes have been demonstrated. In particular, a fuel cell with a 25 micron thick CsH2PO4 membrane was fabricated and yielded a power density of 425 mW/cm2 at 26O C (H2/O2) without pressurization. In this configuration, the thin-film fuel cell is supported on a porous stainless steel gas diffusion layer and the electrocatalyst and electrolyte layers are spray-deposited. In parallel with these efforts, new, water-insoluble electrolytes have been developed. In particular, the new series of compounds Ba3-xKxHx(PO4)2 were prepared and shown to have conductivities of 3 x 10̂-5 S/cm at 250 C. Although not as high as the conductivity of CsH2PO4, this result demonstrates the feasibility of obtaining proton transport via dynamic oxyanion reorientation in insoluble compounds. In addition, we have shown that it is possible to exchange out the Li in silicate salts such as LiLa9(SiO4)6O2, using a relatively weak acid (e.g. H3PO4) to once again produce proton conducting water insoluble compounds
Materials chemistry of superprotonic solid acids /cMikhail N. Kislitsyn ; Sossina Haile, committee chair and advisor by Mikhail N Kislitsyn( Book )

1 edition published in 2009 in English and held by 2 WorldCat member libraries worldwide

Superprotonic solid acids : structure, properties, and applications by Dane Andrew Boysen( Book )

1 edition published in 2004 in English and held by 2 WorldCat member libraries worldwide

Sol-gel synthesis of highly oriented lead barium titanate and lanthanum nickelate thin films for high strain sensor and actuator applications by Stacey Walker Boland( Book )

1 edition published in 2005 in English and held by 2 WorldCat member libraries worldwide

Low temperature catalytic ethanol conversion over ceria-supported platinum, rhodium, and tin-based nanoparticle systems by Eugene Leo Draine Mahmoud( )

2 editions published in 2010 in English and held by 2 WorldCat member libraries worldwide

"Metallic nanoparticle alloys were synthesized with ceria supports to produce the catalyst systems studied. Gas phase byproducts of catalytic ethanol reforming were analyzed for temperature-dependent trends and chemical reaction kinetic parameters. Results of catalytic data indicate that catalyst composition plays a significant role in low-temperature ethanol conversion. Analysis of byproduct yields demonstrate how ethanol steam reforming over bimetallic catalyst systems (platinum-tin and rhodium-tin) results in higher hydrogen selectivity than was yielded over single-metal catalysts. Additionally, oxidative steam reforming results reveal a correlation between catalyst composition, byproduct yield, and ethanol conversion. By analyzing the role of temperature and reactant composition on byproduct yields from ethanol reforming, this study also proposes how these parameters may contribute to optimal catalytic ethanol reforming."
Superprotonic solid acid phase transitions and stability by Lisa Cowan( Book )

1 edition published in 2007 in English and held by 1 WorldCat member library worldwide

Chain-forming zintl antimonides as novel thermoelectric materials by Alexandra Zevalkink( )

2 editions published in 2014 in English and held by 1 WorldCat member library worldwide

Zintl phases, a subset of intermetallic compounds characterized by covalently-bonded "sub-structures," surrounded by highly electropositive cations, exhibit precisely the characteristics desired for thermoelectric applications. The requirement that Zintl compounds satisfy the valence of anions through the formation of covalent substructures leads to many unique, complex crystal structures. Such complexity often leads to exceptionally low lattice thermal conductivity due to the containment of heat in low velocity optical modes in the phonon dispersion. To date, excellent thermoelectric properties have been demonstrated in several Zintl compounds. However, compared with the large number of known Zintl phases, very few have been investigated as thermoelectric materials
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1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

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1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

Abstract : As measured by the electrical conductivity relaxation method, oxidation of undoped ceria at 1400 °C under moist oxygen proceeds in a parallel process of uncorrelated oxidation by H2 O and by O2 . Abstract : The chemical surface reaction rate constant controlling the change of oxidation state of undoped ceria, k Chem, was measured at 1400 °C in the range of (∼0 ≤ ( p H2 O/atm) ≤ 0.163(9)) and (10 −3.85 ≤ ( p O2 /atm) ≤ 10 −2.86 ) via the electrical conductivity relaxation method. In humidified atmospheres, k Chem is fully described as the sum of k Chem, O2 and k Chem, H2 O, which are, respectively, the rate constants for oxidation by O2 and by H2 O alone. Using measurements under appropriately controlled gas conditions, the total rate constant is found to follow the correlation k Chem /cm s −1 = 10 −(1.35±0.07) × ( p O2 /atm) 0.72±0.02 + 10 −(3.85±0.03) × ( p H2 O/atm) 0.36±0.03 where the p O2 and p H2 O values of relevance are explicitly those of the final gas condition. The results suggest that at such high temperatures, the concentrations of surface adsorbed species are too low to influence the independent reaction pathways
Electrical, electrochemical, and optical characterization of ceria films by Tʻae-sik O( )

2 editions published in 2013 in English and held by 1 WorldCat member library worldwide

Acceptor-doped ceria has been recognized as a promising intermediate temperature solid oxide fuel cell electrode/electrolyte material. For practical implementation of ceria as a fuel cell electrolyte and for designing model experiments for electrochemical activity, it is necessary to fabricate thin films of ceria. Here, metal-organic chemical vapor deposition was carried out in a homemade reactor to grow ceria films for further electrical, electrochemical, and optical characterization. Doped/undoped ceria films are grown on single crystalline oxide wafers with/without Pt line pattern or Pt solid layer. Deposition conditions were varied to see the effect on the resultant film property. Recently, proton conduction in nanograined polycrystalline pellets of ceria drew much interest. Thickness-mode (through-plane, z-direction) electrical measurements were made to confirm the existence of proton conductivity and investigate the nature of the conduction pathway: exposed grain surfaces and parallel grain boundaries. Columnar structure presumably favors proton conduction, and we have found measurable proton conductivity enhancement. Electrochemical property of gas-columnar ceria interface on the hydrogen electrooxidation is studied by AC impedance spectroscopy. Isothermal gas composition dependence of the electrode resistance was studied to elucidate Sm doping level effect and microstructure effect. Significantly, preferred orientation is shown to affect the gas dependence and performance of the fuel cell anode. A hypothesis is proposed to explain the origin of this behavior. Lastly, an optical transmittance based methodology was developed to obtain reference refractive index and microstructural parameters (thickness, roughness, porosity) of ceria films via subsequent fitting procedure
Impedance spectroscopy as a tool for electrochemical study of mixed conducting ceria by Wei Lai( Book )

1 edition published in 2007 in English and held by 1 WorldCat member library worldwide

Addressing Africa's challenges through materials development( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

 
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Audience Level
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Audience level: 0.66 (from 0.49 for The Histor ... to 0.95 for Solid Acid ...)

Alternative Names
Sossina Haile chimiste américano-éthiopienne

Sossina M. Haile Amerikaans wetenschapster

Languages
English (30)