The Experts below are selected from a list of 23361 Experts worldwide ranked by ideXlab platform
Ioannis G. Kevrekidis - One of the best experts on this subject based on the ideXlab platform.
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the stirred tank reactor polymer electrolyte membrane Fuel Cell
Aiche Journal, 2004Co-Authors: Jay Burton Benziger, Ee Sunn J. Chia, Elizabeth Karnas, Cory Teuscher, J Moxley, Ioannis G. KevrekidisAbstract:The Design and operation of a differential polymer electrolyte membrane (PEM) Fuel Cell is described. The Fuel Cell Design is based on coupled stirred tank reactors (STRs) coupled through a membrane; the gas phase in each reactor compartment is well mixed. The characteristic times for reactant flow, gas phase diffusion, and reaction were chosen so that the gas compositions at both the anode and cathode are uniform. The STR PEM Fuel Cell is one-dimensional; the only spatial gradients are transverse to the membrane. The Cell is used to examine start-up, and dynamic responses to changes in load, temperature, and reactant flow rates. Multiple time scales in the system’s response are found to correspond to water absorption by the membrane, water transport through the membrane, and stress-related mechanical changes of the membrane. © 2004 American Institute of Chemical Engineers AIChE J, 50: 1889 –1900, 2004
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The Stirred Tank Reactor Polymer Electrolyte Membrane Fuel Cell
arXiv: Chemical Physics, 2003Co-Authors: Jay Burton Benziger, Joel F. Moxley, Ee Sunn J. Chia, Elizabeth Karnas, Cory Teuscher, Ioannis G. KevrekidisAbstract:The Design and operation of a differential Polymer Electrolyte Membrane (PEM) Fuel Cell is described. The Fuel Cell Design is based on coupled Stirred Tank Reactors (STR); the gas phase in each reactor compartment was well mixed. The characteristic times for reactant flow, gas phase diffusion and reaction were chosen so that the gas compositions at both the anode and cathode are uniform. The STR PEM Fuel Cell is one-dimensional; the only spatial gradients are transverse to the membrane. The STR PEM Fuel Cell was employed to examine Fuel Cell start- up, and its dynamic responses to changes in load, temperature and reactant flow rates. Multiple time scales in systems response are found to correspond to water absorption by the membrane, water transport through the membrane and stress-related mechanical changes of the membrane.
Miika Rasola - One of the best experts on this subject based on the ideXlab platform.
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x ray transparent proton exchange membrane Fuel Cell Design for in situ wide and small angle scattering tomography
Journal of Power Sources, 2019Co-Authors: Isaac Martens, Antonis Vamvakeros, Raphael Chattot, Maria Valeria Blanco, Miika Rasola, Janne PusaAbstract:Abstract We have constructed a 5 cm 2 proton exchange membrane hydrogen Fuel Cell optimized for transparency of high energy X-rays. This Cell allows for in situ elastic scattering measurements (WAXS, SAXS) during electrochemical operation with minimal trade-offs in Cell performance vs benchtop Designs, and is capable of reaching automotive current densities. A key feature is that the beam enters the Cell at grazing incidence to the electrodes, massively increasing the effective pathlength and therefore the signal-to-background ratio. The 360 ∘ transparency in the plane of the sample permits imaging coupled with advanced techniques, such as X-ray diffraction computed tomography.
Isaac Martens - One of the best experts on this subject based on the ideXlab platform.
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x ray transparent proton exchange membrane Fuel Cell Design for in situ wide and small angle scattering tomography
Journal of Power Sources, 2019Co-Authors: Isaac Martens, Antonis Vamvakeros, Raphael Chattot, Maria Valeria Blanco, Miika Rasola, Janne PusaAbstract:Abstract We have constructed a 5 cm 2 proton exchange membrane hydrogen Fuel Cell optimized for transparency of high energy X-rays. This Cell allows for in situ elastic scattering measurements (WAXS, SAXS) during electrochemical operation with minimal trade-offs in Cell performance vs benchtop Designs, and is capable of reaching automotive current densities. A key feature is that the beam enters the Cell at grazing incidence to the electrodes, massively increasing the effective pathlength and therefore the signal-to-background ratio. The 360 ∘ transparency in the plane of the sample permits imaging coupled with advanced techniques, such as X-ray diffraction computed tomography.
Jay Burton Benziger - One of the best experts on this subject based on the ideXlab platform.
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Fuel Cell Design: The impact of Fuel Cell dynamics on operation
2005Co-Authors: Warren H. J. Hogarth, James P. Nehlsen, Jay Burton BenzigerAbstract:Fuel Cells are sensitive dynamic systems. Their dynamics and performance characteristics must be considered when Designing Cells, stacks, and control systems. When considering a battery and resistor in series as part of an electrical circuit, the internal resistance of the Fuel Cell varies with the area of the Cell. The value of R·A (R = internal resistance) is constant with area, but varies with the state of hydration of the membrane and the quality of the electrode-membrane interfaces. Reducing R by increasing the Fuel Cell area is equivalent to reducing the R of the battery by placing several batteries in parallel. The resistance values add for either Fuel Cells or batteries in series. This is an abstract of a paper presented at the ACS Fuel Chemistry Meeting (Washington, DC Fall 2005).
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the stirred tank reactor polymer electrolyte membrane Fuel Cell
Aiche Journal, 2004Co-Authors: Jay Burton Benziger, Ee Sunn J. Chia, Elizabeth Karnas, Cory Teuscher, J Moxley, Ioannis G. KevrekidisAbstract:The Design and operation of a differential polymer electrolyte membrane (PEM) Fuel Cell is described. The Fuel Cell Design is based on coupled stirred tank reactors (STRs) coupled through a membrane; the gas phase in each reactor compartment is well mixed. The characteristic times for reactant flow, gas phase diffusion, and reaction were chosen so that the gas compositions at both the anode and cathode are uniform. The STR PEM Fuel Cell is one-dimensional; the only spatial gradients are transverse to the membrane. The Cell is used to examine start-up, and dynamic responses to changes in load, temperature, and reactant flow rates. Multiple time scales in the system’s response are found to correspond to water absorption by the membrane, water transport through the membrane, and stress-related mechanical changes of the membrane. © 2004 American Institute of Chemical Engineers AIChE J, 50: 1889 –1900, 2004
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The Stirred Tank Reactor Polymer Electrolyte Membrane Fuel Cell
arXiv: Chemical Physics, 2003Co-Authors: Jay Burton Benziger, Joel F. Moxley, Ee Sunn J. Chia, Elizabeth Karnas, Cory Teuscher, Ioannis G. KevrekidisAbstract:The Design and operation of a differential Polymer Electrolyte Membrane (PEM) Fuel Cell is described. The Fuel Cell Design is based on coupled Stirred Tank Reactors (STR); the gas phase in each reactor compartment was well mixed. The characteristic times for reactant flow, gas phase diffusion and reaction were chosen so that the gas compositions at both the anode and cathode are uniform. The STR PEM Fuel Cell is one-dimensional; the only spatial gradients are transverse to the membrane. The STR PEM Fuel Cell was employed to examine Fuel Cell start- up, and its dynamic responses to changes in load, temperature and reactant flow rates. Multiple time scales in systems response are found to correspond to water absorption by the membrane, water transport through the membrane and stress-related mechanical changes of the membrane.
Janne Pusa - One of the best experts on this subject based on the ideXlab platform.
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x ray transparent proton exchange membrane Fuel Cell Design for in situ wide and small angle scattering tomography
Journal of Power Sources, 2019Co-Authors: Isaac Martens, Antonis Vamvakeros, Raphael Chattot, Maria Valeria Blanco, Miika Rasola, Janne PusaAbstract:Abstract We have constructed a 5 cm 2 proton exchange membrane hydrogen Fuel Cell optimized for transparency of high energy X-rays. This Cell allows for in situ elastic scattering measurements (WAXS, SAXS) during electrochemical operation with minimal trade-offs in Cell performance vs benchtop Designs, and is capable of reaching automotive current densities. A key feature is that the beam enters the Cell at grazing incidence to the electrodes, massively increasing the effective pathlength and therefore the signal-to-background ratio. The 360 ∘ transparency in the plane of the sample permits imaging coupled with advanced techniques, such as X-ray diffraction computed tomography.
