Jonathan R. Scheffe
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View article: Thermodynamic properties, defect equilibria, and water splitting behavior of Ga- doped LSM perovskite
Thermodynamic properties, defect equilibria, and water splitting behavior of Ga- doped LSM perovskite Open
Thermodynamic properties of a Ga-doped La–Sr–Mn perovskite are experimentally extracted and used to compare its water splitting behavior to ceria.
View article: Solar Thermochemical Redox Cycling Using Ga- and Al-Doped LSM Perovskites for Renewable Hydrogen Production
Solar Thermochemical Redox Cycling Using Ga- and Al-Doped LSM Perovskites for Renewable Hydrogen Production Open
Solar thermochemical hydrogen production using redox-active metal oxides is a promising pathway for the production of green hydrogen and synthetic fuel precursors. Herein, the perovskite material (La0.6Sr0.4)0.95Mn0.8Ga0.2O3–δ (LSMG6482) i…
View article: University of Florida
University of Florida Open
A partnership with the University of Florida and U.S. Department of Energy's National Renewable Energy Laboratory (NREL) to collect solar data to support future solar power generation in the United States. The measurement station monitors …
View article: LaMnO<sub>3</sub> Dopants for Efficient Thermochemical Water Splitting Identified by Density Functional Theory Calculations
LaMnO<sub>3</sub> Dopants for Efficient Thermochemical Water Splitting Identified by Density Functional Theory Calculations Open
While ceria is the standard material for two-step water splitting, perovskites are emerging as viable alternatives. In this work, based on the orthorhombic LaMnO3 supercell, we substitute Li Na K Rb Mg Ca Sr Ba on the A-sites (La sites) an…
View article: Assessment of Bulk Oxygen Capacity and Transient Redox Behavior of Foamed Lanthanum Strontium Manganese Perovskites
Assessment of Bulk Oxygen Capacity and Transient Redox Behavior of Foamed Lanthanum Strontium Manganese Perovskites Open
Synthesis of solar thermochemical hydrogen (STCH) production redox materials with engineered structures, for example, replica foams, can enable efficient heat and mass transport and are critical for scaled-up systems. Prior work has motiva…
View article: Metal ferrite spinel energy storage devices and methods for making and using same
Metal ferrite spinel energy storage devices and methods for making and using same Open
1-100 nm metal ferrite spinel coatings are provided on substrates, preferably by using an atomic layer deposition process. The coatings are able to store energy such as solar energy, and to release that stored energy, via a redox reaction.…
View article: Solar Hydrogen Production
Solar Hydrogen Production Open
This Special Issue on solar hydrogen production focuses on innovative approaches and emerging technologies to transform solar energy into H2 or derivative energy carriers via water splitting pathways; those discussed include photoelectroch…
View article: A Laser-Based Heating System for Studying the Morphological Stability of Porous Ceria and Porous La0.6Sr0.4MnO3 Perovskite during Solar Thermochemical Redox Cycling
A Laser-Based Heating System for Studying the Morphological Stability of Porous Ceria and Porous La0.6Sr0.4MnO3 Perovskite during Solar Thermochemical Redox Cycling Open
Thermochemical processes are considered promising pathways to utilize solar energy for fuel production. Several physico-chemical, kinetic and thermodynamic properties of candidate oxides have been studied, yet their morphological stability…
View article: Combined Ceria Reduction and Methane Reforming in a Solar-Driven Particle-Transport Reactor
Combined Ceria Reduction and Methane Reforming in a Solar-Driven Particle-Transport Reactor Open
We report on the experimental performance of a solar aerosol reactor for carrying out the combined thermochemical reduction of CeO2 and reforming of CH4 using concentrated radiation as the source of process heat. The 2 kWth solar reactor p…
View article: Solar kerosene from H2O and CO2
Solar kerosene from H2O and CO2 Open
The entire production chain for renewable kerosene obtained directly from sunlight, H2O, and CO2 is experimentally demonstrated. The key component of the production process is a high-temperature solar reactor containing a reticulated porou…
View article: Reticulated porous ceria undergoing thermochemical reduction with high-flux irradiation
Reticulated porous ceria undergoing thermochemical reduction with high-flux irradiation Open
A numerical and experimental analysis is performed on the solar-driven thermochemical reduction of ceria as part of a H2O/CO2-splitting redox cycle. A transient heat and mass transfer model is developed to simulate reticulated porous ceram…
View article: Experimental Demonstration of the Thermochemical Reduction of Ceria in a Solar Aerosol Reactor
Experimental Demonstration of the Thermochemical Reduction of Ceria in a Solar Aerosol Reactor Open
We report on the experimental demonstration of an aerosol solar reactor for the thermal reduction of ceria, as part of a thermochemical redox cycle for splitting H2O and CO2. The concept utilizes a cavity-receiver enclosing an array of alu…
View article: Splitting CO<sub>2</sub> with a ceria‐based redox cycle in a solar‐driven thermogravimetric analyzer
Splitting CO<sub>2</sub> with a ceria‐based redox cycle in a solar‐driven thermogravimetric analyzer Open
Thermochemical splitting of CO 2 via a ceria‐based redox cycle was performed in a solar‐driven thermogravimetric analyzer. Overall reaction rates, including heat and mass transport, were determined under concentrated irradiation mimicking …
View article: Reactive Absorption of CO 2 Using Ethylaminoethanol Promoted Aqueous Potassium Carbonate Solvent
Reactive Absorption of CO 2 Using Ethylaminoethanol Promoted Aqueous Potassium Carbonate Solvent Open
Atmospheric concentration of CO 2 , which is considered as one of the major greenhouse gases (GHGs), has increased up to 398 ppmv as of 2015. CO 2 concentration in atmosphere was 280 ppmv in pre-industrial era, and due to the continuous di…
View article: Solar Thermochemical CO 2 Utilization via Ceria Based Redox Cycle
Solar Thermochemical CO 2 Utilization via Ceria Based Redox Cycle Open
According to the recent studies, it is expected that the global energy requirement will increase from 14 TW to 30 TW by the year 2050. Currently, fossil fuels are the major energy source utilized for the fulfillment of the energy requireme…
View article: Oxygen nonstoichiometry, defect equilibria, and thermodynamic characterization of LaMnO3 perovskites with Ca/Sr A-site and Al B-site doping
Oxygen nonstoichiometry, defect equilibria, and thermodynamic characterization of LaMnO3 perovskites with Ca/Sr A-site and Al B-site doping Open
ISSN:1359-6454
View article: Lanthanum Manganite Perovskites with Ca/Sr A‐site and Al B‐site Doping as Effective Oxygen Exchange Materials for Solar Thermochemical Fuel Production
Lanthanum Manganite Perovskites with Ca/Sr A‐site and Al B‐site Doping as Effective Oxygen Exchange Materials for Solar Thermochemical Fuel Production Open
Perovskite oxides have recently been proposed as promising redox intermediates for solar thermochemical splitting of H 2 O and CO 2 , offering the benefit of significantly reduced operating temperatures. We present a systematic experimenta…
View article: Kinetics of CO<sub>2</sub> Reduction over Nonstoichiometric Ceria
Kinetics of CO<sub>2</sub> Reduction over Nonstoichiometric Ceria Open
The kinetics of CO2 reduction over nonstoichimetric ceria, CeO2-δ, a material of high potential for thermochemical conversion of sunlight to fuel, has been investigated for a wide range of nonstoichiometries (0.02 ≤ δ ≤ 0.25), temperatures…
View article: Oxygen nonstoichiometry and thermodynamic characterization of Zr doped ceria in the 1573–1773 K temperature range
Oxygen nonstoichiometry and thermodynamic characterization of Zr doped ceria in the 1573–1773 K temperature range Open
The thermodynamics and defect chemistry of Zr4+-doped ceria is investigated and discussed in regards to the efficiency of solar thermochemical redox cycles.