SOFC Anodes Based on Infiltration of La0.3Sr0.7TiO3 (2008)
Lee, Shiwoo, Kim, Guntae, Vohs, John M, Gorte, Raymond J
Composites formed by infiltration of 45 wt % La0.3Sr0.7TiO3 (LST) into 65% porous yttria-stabilized zirconia (YSZ) were examined for application as solid oxide fuel cell (SOFC) anodes. Although LST...
Dagle, R. A, Platon, A., Palo, D. R., Datye, A. K, Vohs, John M, Wang, Y.
Pd/ZnO/Al2O3 catalysts were studied for water-gas-shift (WGS), methanol steam reforming, and reverse-water-gas-shift (RWGS) reactions. WGS activity was found to be dependent on the Pd:Zn ratio with a...
Efficient Reduction of CO2 in a Solid Oxide Electrolyzer (2008)
Bidrawn, F., Kim, G., Corre, G., Irvine, J. T.S., Vohs, John M, Gorte, Raymond J
The electrolysis of CO2 has been examined in a solid oxide electrolyzer (SOE) using a ceramic electrode based on La0.8Sr0.2Cr0.5Mn0.5O3 (LSCM), infiltrated into a yttria-stabilized zirconia scaffold...
Engineering Composite Oxide SOFC Anodes for Efficient Oxidation of Methane (2008)
Kim, Guntae, Corre, G., Irvine, J. T. S., Vohs, John M, Gorte, Raymond J
Ceramic anodes for solid oxide fuel cells SOFCs were prepared by aqueous impregnation of nitrate salts to produce composites with 45 wt % La0.8Sr0.2Cr0.5Mn0.5O3 (LCSM)in a 65% porous...
SOFC Anodes Based on LST-YSZ Composites and on Y0.04Ce0.48ZrM0.48O2 (2008)
Kim, Guntae, Gross, Michael D, Wang, Wensheng, Vohs, John M, Gorte, Raymond J
The properties of solid oxide fuel cell (SOFC) anode functional layers prepared by impregnation of 1 wt % Pd and 10 wt % ceria into porous scaffolds of either Y0.04Ce0.48Zr0.48O2 (CZY) or composites...
Wang, Wensheng, Gorte, Raymond J, Vohs, John M
The performance of solid oxide electrolysis (SOE) cells while operating in the natural gas assisted steam electrolysis (NGASE) mode was evaluated. The SOE cells used yttria-stabilized-zirconia (YSZ)...
Site requirements for the reactions of CH3SH and (CH3)2S2 on ZnO(10(1)Overbar 0) (2008)
Temperature programmed desorption (TPD) was used to investigate the adsorption and reaction of CH3SH and (CH3)2S2 on the nonpolar (10(1) Overbar 0) surface of ZnO. Methanethiol was found to...
Bidrawn, Fred, Lee, S., Vohs, John M, Gorte, Raymond J
The influence of ionic conductivity on the performance of solid oxide fuel cell cathodes was studied for electrodes prepared by infiltration of 40 wt % La0.8Ca0.2FeO3 (LCF) La0.8Sr0.2FeO3 (LSF) and...
Hydrogen Production via CH4 and CO Assisted Steam Electrolysis (2007)
Wang, Wensheng, Vohs, John M, Gorte, Raymond J
Porous composite anodes consisting of a yttria-stabilized zirconia (YSZ) backbone that was impregnated with CeO2 and various amounts of metallic components including Cu, Co and Pd were fabricated....
Interaction of CO with Surface PdZn Alloys (2007)
Jeroro, Eseoghene, Lebarbier, V., Datye, A., Wang, Y., Vohs, John M
The adsorption and bonding configuration of CO on clean and Zn-covered Pd(111) surfaces was studied using Low Energy Electron Diffraction (LEED), Temperature Programmed Desorption (TPD) and High...
Preparation of SOFC Anodes by Electrodeposition (2007)
Jung, Sukwon, Vohs, John M, Gorte, Raymond J
Anodes for solid oxide fuel cells (SOFCs) have been prepared by electrodeposition of either Co or Ni into a layer of porous yttria-stabilized zirconia (YSZ), 60 µm thick. The YSZ, having 65%...
An Examination of SOFC Anode Functional Layers Based on Ceria in YSZ (2007)
Gross, Michael D, Vohs, John M, Gorte, Raymond J
The properties of solid oxide fuel cell (SOFC) anode functional layers prepared by impregnation of ceria and catalytic metals into porous yttria-stabilized zirconia (YSZ) have been examined for...
A Support Layer for Solid Oxide Fuel Cells (2007)
Ahn, Kipyung, Jung, Sukwon, Vohs, John M, Gorte, Raymond J
The use of a perforated, ceramic layer, laminated on top of a porous electrode, as a support structure for solid oxide fuel cells is described. The support layer can be used on either the anode or...
The Stability of LSF-YSZ Electrodes Prepared by Infiltration (2007)
Wang, Wensheng, Gross, Michael D, Vohs, John M, Gorte, Raymond J
Composite electrodes were prepared by adding 40 wt % La0.8Sr0.2FeO3 (LSF) into porous yttria-stabilized zirconia (YSZ) and their performance was studied as a function of time and calcination...
A Strategy for Achieving High-performance with SOFC Ceramic Anodes (2007)
Gross, Michael D, Vohs, John M, Gorte, Raymond J
A proposal that high solid oxide fuel cell (SOFC) anode performance can be achieved by using a very thin, catalytically active functional layer, with a noncatalytic conduction layer, has been tested....
Deactivation of Ceria-Based SOFC Anodes in Methanol (2007)
Kim, Taeyoon, Ahn, Kipyung, Vohs, John M, Gorte, Raymond J
The performance and stability of Cu-ceria-YSZ (yttria-stabilized zirconia) and carbon-ceria-YSZ, solid-oxide-fuel-cell (SOFC) anodes were examined in neat (100%) methanol at 973K and compared to the...
Gross, Michael D, Vohs, John M, Gorte, Raymond J
Cu-based, solid oxide fuel cell (SOFC) electrodes were modified by electrodeposition of Co. The addition of only 5-vol% Co by electrodeposition significantly improved the thermal stability compared...
Recent Progress in SOFC Anodes for Direct Utilization of Hydrocarbons (2007)
Gross, Michael D, Vohs, John M, Gorte, Raymond J
There would be significant advantages to having anodes for solid oxide fuel cells (SOFC) that were capable of directly utilizing hydrocarbon fuels. Because conventional Ni-based anodes catalyze the...
Pursell, David B, Vohs, John M, Dai, Hai-Lung
On the Ag(1 1 1) surface pre-adsorbed with Cl, TDS and HREELS studies find that vinyl chloride physisorbs molecularly with a binding energy 8 kJ/mol stronger and an adsorption geometry more parallel...
Growth and structure of Pd films on ZnO(0001) (2006)
Bera, Parthasarathi, Vohs, John M
The growth and structure of Pd films on ZnO(0001) were investigated using high resolution electron energy loss spectroscopy, x-ray photoelectron spectroscopy, and low energy electron diffraction....
TPD study of the reaction of CH3CH2SH and (CH3CH2)2S2 on ZnO(0001) and ZnO (2006)
Temperature programmed desorption (TPD) was used to study the reaction of CH3CH2SH and (CH3CH2)2S2 on the (0001) and surface of ZnO. The interaction of these molecules with ZnO was found to be...
A Comparison of LSM, LSF, and LSCo for Solid Oxide Electrolyzer Anodes (2006)
Wang, Wensheng, Huang, Yingyi, Jung, Sukwon, Vohs, John M, Gorte, Raymond J
Composite electrodes of yttria-stabilized zirconia (YSZ) with La0.8Sr0.2MnO3 (LSM), La0.8Sr0.2FeO3 (LSF), and La0.8Sr0.2CoO3 (LSCo) were prepared and tested as solid oxide electrolyzer (SOE) anodes...
Electrodeposition of Cu into a Highly Porous Ni/YSZ Cermet (2006)
Jung, Sukwon, Gross, Michael D, Gorte, Raymond J, Vohs, John M
The electrochemical deposition of Cu into 0.12 cm and 60 µm thick, highly porous 65 vol % Ni/yttria-stabilized zirconia (YSZ) cermets was investigated. An electrochemical cell in which the...
A Study of Carbon Formation and Prevention in Hydrocarbon-Fueled SOFC (2006)
Kim, Taeyoon, Liu, G., Boaro, Marta, Vohs, John M, Gorte, Raymond J, ...
The formation and removal of the carbonaceous deposits formed by n-butane and liquid hydrocarbons, such as n-decane and proprietary light and heavy naphthas, between 973 and 1073 K on YSZ and...
Jung, Sukwon, Lu, Chun, He, Hongpeng, Ahn, Kipyung, Gorte, Raymond J, Vohs, John M
In this study, we report on how different impregnation procedures affect the distribution and morphology of the Cu component in Cu/CeO2/YSZ composite anodes and how this affects anode performance....
Structure and Thermal Stability of Ceria Films Supported on YSZ(100) and α-Al2O3(0001) (2005)
Costa-Nunes, Olga, Ferrizz, Robert M, Gorte, Raymond J, Vohs, John M
The morphology and reducibility of vapor-deposited ceria films supported on yttria-stabilized zirconia (100) (YSZ(100)) and α-Al2O3(0001) single crystals were studied using X-ray photoelectron...
Costa-Nunes, Olga, Gorte, Raymond J, Vohs, John M
In this study the performance of a solid oxide fuel cell (SOFC) with Cu-CeO2-yttria-stabilized zirconia (YSZ) was compared to an SOFC with Ni-YSZ anode while operating on H2, CO, and syngas fuels....
Lu, C., An, Sungbae, Worrell, Wayne L., Vohs, John M, Gorte, Raymond J
In this study, we compare the performance of SOFC having composite Cu-based anodes but made with the following low-temperature electrolytes: samaria-doped ceria (SDC), Sr- and Mg-doped lanthanum...
Characterization of YSZ-YST Composites for SOFC Anodes (2004)
He, Hongpeng, Huang, Yingyi, Vohs, John M, Gorte, Raymond J
Porous composites of Sr0.88Y0.08TiO3-δ (YST) and yttria-stabilized zirconia (YSZ) were formed by tape-casting methods and examined as potential anodes for SOFC. Even after calcination to 1773 K, the...
Recent Developments on Anodes for Direct Fuel Utilization in SOFC (2004)
Gorte, Raymond J, Vohs, John M, McIntosh, Steven
This paper reviews recent work on SOFC anode fabrication at the University of Pennsylvania. In this work, anode fabrication is based on the preparation of a porous YSZ matrix, into which electronic...
Low-Temperature Fabrication of Oxide Composites for Solid-Oxide Fuel Cells (2004)
He, Hongpeng, Huang, Yingyi, Regal, Juleiga, Boaro, Marta, Vohs, John M, Gorte, Raymond J
Composites of yttria-stabilized zirconia (YSZ) with Sr-doped LaCrO3 (LSC) and Sr-doped LaMnO3 (LSM) were prepared by impregnation of a porous YSZ matrix with aqueous solutions of the appropriate...
Measurement of Electrode Overpotentials for Direct Hydrocarbon Conversion Fuel Cells (2004)
Krishnan, Venkatesan V., McIntosh, Steven, Gorte, Raymond J, Vohs, John M
Cathodic and anodic overpotentials were measured using current interruption and AC impedance spectroscopy for two separate solid oxide fuel cells (SOFCs). The fuel cells used yttria-stabilized...
Advanced Anodes for High Temperature Fuel Cells (2004)
Atkinson, A., Barnett, S., Gorte, Raymond J, Irvine, J. T.S., McEvoy, A. J., Mogensen, M. B, ...
Fuel cells will undoubtedly find widespread use in this new millennium in the conversion of chemical to electrical energy, as they offer very high efficiencies and have unique scalability in...
Ferrizz, Robert M, Gorte, Raymond J, Vohs, John M
The interaction of sulfur with ceria under highly reducing conditions was investigated. The phase boundary between CeO1.83 and Ce2O2S was determined for temperatures between 873 and 1073 K. This data...
Novel SOFC anodes for the direct electrochemical oxidation of hydrocarbons (2003)
Gorte, Raymond J, Vohs, John M
Recent developments in solid-oxide fuel cells (SOFC) that electrochemically oxidize hydrocarbon fuels to produce electrical power without first reforming them to H2 are described. First, the...
Wong, Gordon Sek-Yin, Concepcion, M. R, Vohs, John M
The growth, and reactivity of monolayer V2O5 films supported on TiO2(110) produced via the oxidation of vapor-deposited vanadium were studied using X-ray photoelectron spectroscopy (XPS) and...
Synthesis of Highly Porous Yttria-Stabilized Zirconia by Tape-Casting Methods (2003)
Boaro, Marta, Vohs, John M, Gorte, Raymond J
Porous ceramics of Y2O3-stabilized ZrO2 (YSZ) were prepared by tape-casting methods using both pyrolyzable pore formers and NiO followed by acid leaching. The porosity of YSZ wafers increased in a...
An Examination of Sulfur Poisoning on Pd/Ceria Catalysts (2002)
Luo, T., Vohs, John M, Gorte, Raymond J
The species formed by exposure of a Pd/ceria catalyst to SO2 under various conditions have been studied using temperature-programmed desorption (TPD) and FTIR. For adsorption of SO2 between 298 and...
TPD and XPS Investigation of the Interaction of SO2 with Model Ceria Catalysts (2002)
Ferrizz, Robert M, Gorte, Raymond J, Vohs, John M
The interaction of SO2 with model thin film ceria catalysts was studied using temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). During TPD of ceria samples that had...
An Examination of Lanthanide Additives on the Performance of Cu-YSZ Cermet Anodes (2002)
McIntosh, Steven, Vohs, John M, Gorte, Raymond J
The effect of various lanthanide additives on the performance of Cu-YSZ (yttria-stabilized zirconia), cermet anodes for solid-oxide fuel cells (SOFCs) was investigated at 973 K for H2 and the direct...
Kim, Hyuk, Da Rosa, Calvin, Boaro, Marta, Vohs, John M, Gorte, Raymond J
Porous Y2O3-stabilized ZrO2 (YSZ) samples were synthesized by preparing NiO/YSZ composites by tape casting and calcining at 1800 K, reducing the NiO to nickel in H2 at 973 K, and finally leaching the...
Novel SOFC Anodes for the Direct Electrochemical Oxidation of Hydrocarbon (2002)
Gorte, Raymond J, Kim, H., Vohs, John M
This paper describes recent developments in solid-oxide fuel cells (SOFC) that use Cu-based cermets as the anode for direct oxidation of hydrocarbon fuels, including liquids such as gasoline, to...
Site Specific Reactions of B and Si Based Compounds in Carbon. (1997)
Bonnell, Dawn A., Vohs, John M.
This report summarizes the progress made during three years of an AFOSR sponsored program directed towards understanding the atomic details of oxidation resistance in carbon based composites. The...
Bisphosphonate-mediated gene vector delivery from the metal surfaces of stents
Fishbein, Ilia, Alferiev, Ivan S., Nyanguile, Origene, Gaster, Richard, Vohs, John M., Wong, Gordon S., ...
The clinical use of metallic expandable intravascular stents has resulted in improved therapeutic outcomes for coronary artery disease. However, arterial reobstruction after stenting, in-stent...
Bisphosphonate-mediated gene vector delivery from the metal surfaces of stents
Fishbein, Ilia, Alferiev, Ivan S., Nyanguile, Origene, Gaster, Richard, Vohs, John M., Wong, Gordon S., ...
The clinical use of metallic expandable intravascular stents has resulted in improved therapeutic outcomes for coronary artery disease. However, arterial reobstruction after stenting, in-stent...