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Search Publications by: Eli Baltic (Fed)

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Displaying 1 - 16 of 16

Simultaneous characterization of operando multi-material distribution via high-contrast correlative tomographic microscopy

November 8, 2023
Author(s)
Pranay Shrestha, Jacob LaManna, Kieran Fahy, Pascal Kim, ChungHyuk Lee, Jason Lee, Elias Baltic, David Jacobson, Daniel Hussey, Aimy Bazylak
High-contrast tomographic microscopy of evolving multi-material systems, such as electrochemical devices, offers a unique and often exclusive perspective into inner workings of these complex systems. Here, we characterize the operando spatiotemporal

A Goldilocks Approach to Water Management: Amphiphilic Porous Transport Layers for Unitized Reversible Fuel Cells

March 14, 2023
Author(s)
Siddharth Komini Babu, Abdurrahman Yilmaz, Md Aman Uddin, Jacob LaManna, Elias Baltic, David Jacobson, Ugur Pasaogullari, Jacob Spendelow
Unitized reversible fuel cells (URFCs) are a promising option for both local and grid-scale energy storage, and could help facilitate the deployment of intermittent renewable power sources. URFCs consist of a single cell that operates in both fuel cell (FC

Superhydrophilic porous transport layer enhances effciency of polymer electrolyte membrane electrolyzers

October 20, 2021
Author(s)
Benzhong Zhao, ChungHyuk Lee, Jason K. Lee, Kieran F. Fahy, Jacob LaManna, Elias Baltic, David Jacobson, Daniel Hussey, Aimy Bazylak
Hydrogen is widely regarded as a promising vehicle for renewable energy storage due to its versatility and high energy density. A prominent technology for hydrogen generation is the polymer electrolyte membrane (PEM) electrolyzer, which decomposes liquid

A portable triaxial cell for beamline imaging of rocks under triaxial state of stress

April 21, 2021
Author(s)
Amer Syed, Yukie Tanino, Jacob LaManna, David L. Jacobson, Daniel S. Hussey, Eli Baltic, Genoveva Burca
With recent developments in direct imaging techniques using x-ray and neutron imaging, there is an increasing need for an efficient design of a test setup to study mechanical and/or the transport behaviour of porous rocks. Bespoke design from commercial

Electrolyte Layer Gas Triggers Cathode Potential Instability in CO2 Electrolyzers

February 1, 2021
Author(s)
Kevin Krause, Jason K. Lee, ChungHyuk Lee, Hisan W. Shafaque, Pascal J. Kim, Kieran F. Fahy, Pranay Shrestha, Jacob LaManna, Elias Baltic, David Jacobson, Daniel Hussey, Aimy Bazylak
Electrolytic carbon dioxide (CO2) reduction is becoming increasingly promising for managing anthropogenic CO2 emissions; however, issues related to unstable performance and ineffective gas management are still not fully accounted for in the field. Here, we

Spatially graded porous transport layers for gas evolving electrochemical energy conversion: High performance polymer electrolyte membrane electrolyzers

December 15, 2020
Author(s)
Jason K. Lee, ChungHyuk Lee, Kieran F. Fahy, Pascal J. Kim, Jacob LaManna, Eli Baltic, Daniel S. Hussey, David L. Jacobson, A Gago, S Kolb, K Friedrich, Aimy Bazylak
Decarbonizing society's energy infrastructure is foundational for a sustainable future and can be realized by harnessing renewable energy for clean hydrogen and on-demand power with fuel cells. Here, we elucidate how graded porous transport layers (PTLs)

Boosting Membrane Hydration for High Current Densities in Membrane Electrode Assembly CO2 Electrolysis

November 25, 2020
Author(s)
Hisan W. Shafaque, ChungHyuk Lee, Kieran F. Fahy, Jason K. Lee, Jacob LaManna, Eli Baltic, Daniel S. Hussey, David L. Jacobson, Aimy Bazylak
Despite the advantages of CO2 electrolyzers, efficiency losses due to mass and ionic transport across the membrane electrode assembly (MEA) are critical bottlenecks for commercial-scale implementation. In this study, more efficient electrolysis of CO2 was

NIST NeXT: a system for truly simultaneous neutron and X-ray tomography

September 14, 2020
Author(s)
Jacob LaManna, Daniel S. Hussey, Victoria H. DiStefano, Eli Baltic, David L. Jacobson
Neutrons and X-rays provide excellent complementary, nondestructive probes to understand internal structure of systems across engineering and material science. With its sensitivity to hydrogen, neutrons excel at separating fluids, such as water or oil

Accelerating Bubble Detachment in Porous Transport Layers with Patterned Through-Pores

September 9, 2020
Author(s)
Jason K. Lee, ChungHyuk Lee, Kieran F. Fahy, Pascal J. Kim, Kevin Krause, Jacob LaManna, Eli Baltic, Daniel S. Hussey, David L. Jacobson, Aimy Bazylak
Mass transport losses ultimately suppress gas evolving electrochemical energy conversion technologies, such as fuel cells and carbon dioxide electrolyzers, from reaching the high current densities needed to realize commercial success. In this work, we

Critical Current Density as a Performance Indicator for Gas-Evolving Electrochemical Devices

August 26, 2020
Author(s)
Jason K. Lee, ChungHyuk Lee, Benzhong Zhao, Jacob LaManna, Eli Baltic, Daniel S. Hussey, David L. Jacobson, Aimy Bazylak
Reaching high current densities is absolutely imperative for electrochemical energy conversion, from fuel cells to CO2 reduction. Here, we identify the existence of a performance indicator for gas-evolving electrochemical energy conversion devices: the

Reconciling temperature-dependent factors affecting mass transport losses in polymer electrolyte membrane electrolyzers

June 1, 2020
Author(s)
Jacob LaManna, Aimy Bazylak, ChungHyuk Lee, Jason K. Lee, Kieran F. Fahy, Eli Baltic, Daniel S. Hussey, David L. Jacobson
In this work, we investigated the impact of temperature on two-phase transport in low temperature (LT)-polymer electrolyte membrane (PEM) electrolyzer anode flow channels via in operando neutron imaging and observed a decrease in mass transport

Neutron and X-ray Tomography (NeXT) system for simultaneous, dual modality tomography

November 27, 2017
Author(s)
Jacob M. LaManna, Daniel S. Hussey, Elias M. Baltic, David L. Jacobson
Dual mode tomography offers the potential of improved estimation of the composition of a sample from the complimentary of the interaction of the two probes with the sample. We have developed a simultaneous neutron and 90 keV X-ray tomography system that is

A New Cold Neutron Imaging Instrument at NIST

July 6, 2015
Author(s)
Daniel S. Hussey, Christoph W. Brocker, David L. Jacobson, Thomas R. Gentile, Wangchun Chen, Elias M. Baltic, DV Baxter, J. Doskow, Muhammad D. Arif
The NIST neutron imaging program will build a new imaging instrument in the NCNR guide hall at the end of the neutron guide NG-6, beginning operation in summer of 2014. The NG-6 guide has a spectrum that is strongly peaked at a neutron wavelength of 5 Å

Improving quantitative neutron radiography through image restoration

July 20, 2013
Author(s)
Daniel S. Hussey, Elias M. Baltic, Kevin J. Coakley, David L. Jacobson
This in-situ study examines the water content in polymer electrolyte fuel cells (PEFCs) using neutron radiography. Various conditions such as different polytetraflouroethylene (PTFE) loadings in the gas diffusion media including the micro-porous layer (MPL

Changing Optical Axis Due To Reactor Operation

January 12, 2011
Author(s)
Daniel S. Hussey, David L. Jacobson, Elias M. Baltic
During reactor operation, the neutron flux distribution is modified by the reactor control mechanisms, in the case of the reactor at the National Institute of Standards and Technology, this is determined by the angular position of the Cd shim arms and the