Development Validation and Benchmarking of Quantitative Risk Assessment Tools for Hydrogen Refueling Stations
Abstract not provided.
Publications
Standardizing Solar-to-Hydrogen Efficiency Calculations for the Evaluation of New Water Splitting Materials
Abstract not provided.
HydroGEN: STCH Overview
Abstract not provided.
Hydrogen Production by Solar Thermochemical Water Splitting: Searching for Optimal Nonstoichiometric Perovskite Oxides
Abstract not provided.
Perovskites And Particle Reactor: A Multinational Effort To Advance Solar Hydrogen
Abstract not provided.
How to see and quantify hydrogen concentration (and cryogenic hydrogen) using optical diagnostics
Abstract not provided.
R&D for Safety Codes and Standards: Hydrogen Behavior
Abstract not provided.
Development, Validation, and Benchmarking of Quantitative Risk Assessment Tools for Hydrogen Refueling Stations
Abstract not provided.
Can X-rays reveal the hidden secrets of water-splitting materials?
High Efficiency Solar Thermochemical Reactor for Hydrogen Production
This research and development project is focused on the advancement of a technology that produces hydrogen at a cost that is competitive with fossil-based fuels for transportation. A twostep, solar-driven WS thermochemical cycle is theoretically capable of achieving an STH conversion ratio that exceeds the DOE target of 26% at a scale large enough to support an industrialized economy [1]. The challenge is to transition this technology from the laboratory to the marketplace and produce hydrogen at a cost that meets or exceeds DOE targets.
A novel solar thermochemical water splitting material BaCe0.25Mn0.75O3 for hydrogen production
Abstract not provided.
Renewable energy carriers derived from concentrating solar power and nonstoichiometric oxides
Current Opinion in Green and Sustainable Chemistry
In this paper, we offer a perspective on the current state of material research in a part of the solar fuels community that exploits process heat derived from concentrated solar energy to power simple thermochemical gas-splitting cycles. The working fluid in this process is a nonstoichiometric oxide subject to extreme conditions that repeatedly distorts the lattice by forcing oxygen atoms to move in and out of the crystal. This technology is currently challenged by a need to discover optimal materials and derive robust processes to increase cycle efficiency. In the realm of emerging technologies for converting solar insulation to portable and storable energy carriers, this approach has already proven to be scalable with demonstrations that approach 100 kW. Innovations in materials and methods are required to increase solar utilization and process efficiency in order to achieve commercial viability.
A Brightly-lit Pathway Towards Decarbonizing the US Energy Infrastructure
Abstract not provided.
SOLAR THERMOCHEMICAL WATER SPLITTING: ADVANCES IN MATERIALS AND METHODS
Abstract not provided.
High Effeciency Solar Thermochemical Reactor for Hydrogen Production
Abstract not provided.
Model-free Thermodynamic Relationships for Nonstoichiometric Metal Oxides from Experimental Measurements
Abstract not provided.
High Efficiency Solar Thermochemical Reactor for Hydrogen Production
Abstract not provided.
Origin and Tunability of Unusually Large Surface Capacitance in Doped Cerium Oxide Studied by Ambient-Pressure X-Ray Photoelectron Spectroscopy
Advanced Materials
Abstract not provided.
Design and construction of a cascading pressure reactor prototype for solar-thermochemical hydrogen production
AIP Conference Proceedings
Recent work regarding the efficiency maximization for solar thermochemical fuel production in two step cycles has led to the design of a new type of reactor—the cascading pressure reactor—in which the thermal reduction step of the cycle is completed in multiple stages, at successively lower pressures. This approach enables lower thermal reduction pressures than in single-staged reactors, and decreases required pump work, leading to increased solar to fuel efficiencies. In this work we report on the design and construction of a prototype cascading pressure reactor and testing of some of the key components. We specifically focus on the technical challenges particular to the design, and their solutions.
Design and construction of a cascading pressure reactor prototype for solar-thermochemical hydrogen production
AIP Conference Proceedings
Recent work regarding the efficiency maximization for solar thermochemical fuel production in two step cycles has led to the design of a new type of reactor - the cascading pressure reactor - in which the thermal reduction step of the cycle is completed in multiple stages, at successively lower pressures. This approach enables lower thermal reduction pressures than in single-staged reactors, and decreases required pump work, leading to increased solar to fuel efficiencies. Here we report on the design and construction of a prototype cascading pressure reactor and testing of some of the key components. We especially focus on the technical challenges particular to the design, and their solutions.
Scaling effects in sodium zirconium silicate phosphate (Na1+xZr2SixP3-xO12) ion-conducting thin films
Journal of the American Ceramic Society
Preparation of sodium zirconium silicate phosphate (NaSICon), Na1+xZr2SixP3–xO12 (0.25 ≤ x ≤ 1.0), thin films has been investigated via a chemical solution approach on platinized silicon substrates. Increasing the silicon content resulted in a reduction in the crystallite size and a reduction in the measured ionic conductivity. Processing temperature was also found to affect microstructure and ionic conductivity with higher processing temperatures resulting in larger crystallite sizes and higher ionic conductivities. The highest room temperature sodium ion conductivity was measured for an x = 0.25 composition at 2.3 × 10–5 S/cm. In conclusion, the decreasing ionic conductivity trends with increasing silicon content and decreasing processing temperature are consistent with grain boundary and defect scattering of conducting ions.
Sodium-Ion Conductivity and Scaling Effects in NaSICon Thin Films Prepared Via Chemical Solution Deposition
Abstract not provided.
Ion-conduction mechanisms in NaSICON-type membranes for energy storage and utilization
Next generation metal-ion conducting membranes are key to developing energy storage and utilization technologies like batteries and fuel ce lls. Sodium super-ionic conductors (aka NaSICON) are a class of compounds with AM 1 M 2 (PO 4 ) 3 stoichiometry where the choice of "A" and "M" cation varies widely. This report, which de scribes substitutional derivatives of NZP (NaZr 2 P 3 O 12 ), summarizes the accomplishments of a Laboratory D irected Research and Development (LDRD) project to analyze transport mec hanisms using a combination of in situ studies of structure, composition, and bonding, com bined with first principles theory and modeling. We developed an experimental platform and applied methods, such as synchrotron- based X-ray spectroscopies, to probe the electronic structure of compositionally well-controlled NaSICON films while in operation ( i.e ., conducting Na ions exposed to oxygen or water va por atmospheres). First principles theory and modeling were used to interpret the experimental observations and develop an enhanced understanding of atomistic processes that give rise to, and affect, ion conduction.
Materials and Systems for Thermochemical Carbon Dioxide Splitting as a Route to Solar Fuels
Abstract not provided.
Optimizing Nonstoichiometric Perovskite Oxides for Solar Thermochemical Fuel Production
Abstract not provided.
Results 26–50 of 108