A5046746402- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Advancements in Solid Oxide Fuel Cells
- Catalytic Processes in Materials Science
- Advanced battery technologies research
- Catalysts for Methane Reforming
- Catalysis and Hydrodesulfurization Studies
- Electrochemical Analysis and Applications
- Cancer, Hypoxia, and Metabolism
- Autophagy in Disease and Therapy
- Gas Sensing Nanomaterials and Sensors
- Conducting polymers and applications
- Catalysis and Oxidation Reactions
- Additive Manufacturing Materials and Processes
- Advanced Battery Technologies Research
- Muscle Physiology and Disorders
- Advanced Battery Materials and Technologies
- Mitochondrial Function and Pathology
- Vehicle emissions and performance
- Adipose Tissue and Metabolism
- Sirtuins and Resveratrol in Medicine
- Advancements in Battery Materials
- Welding Techniques and Residual Stresses
- Industrial Gas Emission Control
- Thermal properties of materials
The University of Texas Health Science Center at Houston
2019-2024
Chemours (United States)
2022-2024
DuPont (United States)
2022-2024
United States Naval Research Laboratory
2012-2022
United States Navy
2016-2020
University of Michigan
2005-2014
ADVERTISEMENT RETURN TO ISSUEPREVFeatureNEXTFabrication Method for Laboratory-Scale High-Performance Membrane Electrode Assemblies Fuel CellsCustom catalyst-coated membranes (CCMs) and membrane electrode assemblies (MEAs) are necessary the evaluation of advanced electrocatalysts, gas diffusion media (GDM), ionomers, polymer electrolyte (PEMs), structures designed use in next-generation fuel cells, electrolyzers, or flow batteries. This Feature provides a reliable reproducible fabrication...
Incorporation of short-side chain (SSC) ionomers in the catalyst layers (CL) proton exchange membrane fuel cells (PEMFCs) can improve performance, particularly at low relative humidities. We attempt to understand this effect by comparing PEMFCs with cathode CLs containing Pt on carbon-black (CB) and either SSC Aquivion ionomer or a standard long-side-chain (LSC) Nafion 50% 100% RH. The CL microstructures are characterized for their micro- mesoporosity. formed into probed polarization curves,...
Understanding the respective morphology changes with compression of gas diffusion layer (GDL) and microporous (MPL) in unitized media (GDM) is critical for polymer electrolyte fuel cell (PEFC) high-power performance, as affects ohmic resistance porosity that influences mass-transport resistance. We present a comprehensive study two types GDM (paper-type SGL 29BC felt-type Freudenberg H2315 C2) under varied levels using X-ray computed tomography (CT) to link microstructure performance. The...
One of the most important factors in assembly polymer electrolyte membrane fuel cells (PEMFCs) is to set appropriate normal compressive stress cell balance conflicting demands mitigating gas leaks and decreasing contact resistance without damaging porous components so that optimal performance obtained. Herein we systematically evaluate influence (0 1.4 MPa) on electrode assemblies (MEAs) composed spray-coated catalyst layers (CLs) diffusion media (GDM) containing both a layer (GDL)...
Electrochemical adsorption of SO2 on platinum is complicated by the change in sulfur oxidation state with potential. Here, we attempt to identify products catalyst coated membranes (CCMs) at different electrode potentials using a combination situ K-edge XANES (X-ray absorption near-edge structure) spectroscopy and electrochemical techniques. CCMs employed nanoparticles supported Vulcan carbon (Pt/VC). was adsorbed from SO2/N2 gas mixture while holding Pt/VC-electrode potential 0.1, 0.5, 0.7,...
3D-printing is being touted as a tool for prototyping and manufacturing metal fuel cell bipolar plate (BPP) designs it may speed development lower costs by avoiding costly tooling, plus the 3D parts can be made single piece without welding. We use method of direct laser sintering (DMLS) to make 21 cm2 titanium-alloy BPPs with embedded flow channels. To minimize contact resistance in an individual cell, surface each BPP polished appropriate roughness coated conductive corrosion barrier. The...
We detail the relationships between operating environment and performance of a thin lightweight open-cathode fuel cell based on flexible circuits that may be advantageous for unmanned air vehicle (UAV) propulsion. The is studied in broad range realistic atmospheric flight conditions by mounting it wind tunnel within an environmental chamber. are quantitated terms polarization behavior underlying loss mechanisms discussed qualitatively context electrochemical impedance spectroscopy (EIS), DC...
The poisoning effect of H 2 S and SO in air is compared for phosphoric-acid-doped polybenzimidazole (PBI) membrane perfluorosulfonic acid (Nafion) proton exchange fuel cells (PEMFCs). cathodes PBI PEMFCs are about 70 times more resistant to 1 ppm or S0 than the Nafion PEMFCs. only lose <2% cell performance when exposed have 5.2 7.1% losses with 5 10 over 24 h, respectively. Purging poisoned neat leads complete recovery.
Airborne sulfur contaminants (, , and COS) cause the performance of proton exchange membrane fuel cells (PEMFCs) to degrade because they adsorb Pt catalysts modify reaction sites for oxygen reduction. Electrochemical methods can be used PEMFC recovery by oxidizing adsorbed species on sulfate at high potentials then removing them as water-soluble anions low potentials. We examine effectiveness five distinct after 3 h exposure 1 ppm in air (7 psi) relative humidity . The are tested when...
We investigate the effect of gas diffusion media (GDM) porosity on open-cathode fuel cell operation in challenging ambient air conditions known to exacerbate either dehydration or liquid water saturation. A less porous cathode GDM improves contact that decreases interfacial resistances. relate structural properties heat rejection, oxygen transport, and management using polarization behavior electrochemical impedance spectroscopy. Less reduce measured temperature at surface decrease ohmic...
ABSTRACT Background Metabolic remodeling is a hallmark of the failing heart. Oncometabolic stress during cancer increases activity and abundance ATP-dependent citrate lyase (ACL, Acly ), which promotes histone acetylation cardiac adaptation. ACL critical for de novo synthesis lipids, but how these metabolic alterations contribute to structural functional changes remains unclear. Methods We utilized human heart tissue samples from healthy donor hearts patients with hypertrophic...
Bipolar plates (BPPs) serve multiple roles in polymer electrolyte membrane fuel cells (PEMFCs). When assembled a stack, they provide the structural backbone of plus serial electronic connections. They also gas (air and fuel) coolant distribution pathways. Traditionally, bipolar have been made carbon, but these are being replaced favor metal stamped foils. The Naval Research Laboratory has explored making titanium BPPs using 3D printing methods (direct laser sintering – DMLS) superplastic...
The Naval Research Laboratory has developed hydrogen fuel cell propulsion systems for unmanned air vehicles (UAVs). high electrochemical conversion efficiency of cells combined with the specific energy H 2 makes them suited to extending endurance small UAVs. major consideration UAVs is sufficient system level power (W/kg) take off and (Wh/kg) long endurance. gained from using keeping components lightweight. comes weight fraction storage a cell. compressor heat exchanger are contributors,...