A5011329420- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Advancements in Solid Oxide Fuel Cells
- Advanced battery technologies research
- Conducting polymers and applications
- Electrochemical Analysis and Applications
- Advanced Battery Technologies Research
- Microfluidic and Capillary Electrophoresis Applications
- Advancements in Battery Materials
- Advanced MEMS and NEMS Technologies
- Electron and X-Ray Spectroscopy Techniques
- Analytical Chemistry and Sensors
- Machine Learning in Materials Science
- Electronic and Structural Properties of Oxides
- Hybrid Renewable Energy Systems
- Membrane-based Ion Separation Techniques
- Electrohydrodynamics and Fluid Dynamics
- Advanced Electron Microscopy Techniques and Applications
- Advanced Battery Materials and Technologies
- Nanofabrication and Lithography Techniques
- Mechanical and Optical Resonators
- Chemical Looping and Thermochemical Processes
- Nanopore and Nanochannel Transport Studies
- Lattice Boltzmann Simulation Studies
- Catalytic Processes in Materials Science
Carnegie Mellon University
2015-2024
National Energy Technology Laboratory
2017-2022
Forbes Hospital
2011
Stanford University
2006-2010
TOBB University of Economics and Technology
2008
University of Victoria
2005-2007
Platinum group metal (PGM)-free catalysts for oxygen reduction reaction are essential affordable fuel cells.
Increasing catalytic activity and durability of atomically dispersed metal-nitrogen-carbon (M-N-C) catalysts for the oxygen reduction reaction (ORR) cathode in proton-exchange-membrane fuel cells remains a grand challenge. Here, high-power durable Co-N-C nanofiber catalyst synthesized through electrospinning cobalt-doped zeolitic imidazolate frameworks into selected polyacrylonitrile poly(vinylpyrrolidone) polymers is reported. The distinct porous fibrous morphology hierarchical structures...
Despite decades of development, proton exchange membrane fuel cells (PEMFCs) still lack wide market acceptance in vehicles. To understand the expected trajectories PEMFC attributes that influence adoption, we conducted an expert elicitation assessment current and future cost performance automotive PEMFCs. We elicited 39 experts' assessments system cost, stack durability, power density under a hypothetical, large-scale production scenario. Experts assessed median 2017 to be $75/kW, durability...
Abstract The electrodes of a polymer electrolyte fuel cell (PEFC) are composite porous layers consisting carbon and platinum nanoparticles binder. proper composition arrangement these materials for fast reactant transport high electrochemical activity is crucial to achieving performance, long lifetimes, low costs. Here, the microstructure PEFC electrode using nanometer‐scale X‐ray computed tomography (nano‐CT) with resolution 50 nm investigated. nano‐CT instrument obtains this...
This article reports on the characterization of polymer electrolyte fuel cell (PEFC) cathodes featuring a platinum group metal-free (PGM-free) catalyst using nanoscale resolution X-ray computed tomography (nano-CT) and morphological analysis. PGM-free PEFC have gained significant interest in past decade since they potential to dramatically reduce costs by eliminating large (Pt) raw material cost. However, several challenges remain before are commercially viable. Since these catalysts lower...
Low cost and high-performing platinum group metal-free (PGM-free) cathodes have the potential to transform economics of polymer electrolyte fuel cell (PEFC) commercialization. Significant advancements been made recently in terms PGM-free catalyst activity stability. However, before catalysts become viable PEFCs, several technical challenges must be addressed including cathode's fabrication, ionomer integration, transport losses. Here, we present an integrated optimization cathode performance...
Abstract We report a three‐dimensional (3D), pore‐scale analysis of morphological and transport properties for polymer electrolyte fuel cell (PEFC) catalyst layer. The 3D structure the platinum/carbon/Nafion electrode was obtained using nano‐scale resolution X‐ray computed tomography (nano‐CT). nano‐CT data analyzed according to several characteristics, with particular focus on various effective pore diameters used in modeling gas diffusion Knudsen transition regime, which is prevalent PEFC...
Significant reductions in expensive platinum catalyst loading for the oxygen reduction reaction are needed commercially viable fuel cell electric vehicles as well other important applications. In reducing loading, a resistance at Pt surface presence of thin perfluorosulfonic acid (PFSA) electrolyte film, on order 10 nm thick, becomes significant barrier to adequate performance. However, mechanism is unresolved and could be due gas dissolution kinetics, increased diffusion films, or anion...
This work demonstrates the application of high-resolution, 3D imaging to characterize micro- and nano-scale features iridium oxide (IrO2) anode catalyst layers (CLs) in proton exchange membrane water electrolysis (PEMWE). Scanning electron microscopy (SEM) nanoscale X-ray computed tomography (nano-CT) reveal differences micro-scale between spray-coated blade-coated CLs, CLs along fabrication testing timeline. The electrode thickness distribution tested CL suggests increased thinning regions...
The main objective of this work is to predict the breakthrough pressure liquid water transport through gas diffusion layer (GDL) and/or micro porous (MPL) used in polymer electrolyte membrane fuel cells. integration structural GDL and MPL with Lattice Boltzmann Method primary focused. numerical predictions are also compared experimental data. interaction between phase different surface treatments solid structures controls evolution change capillary pressure. geometries GDLs MPLs were...
ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTHalf-Wave Potential or Mass Activity? Characterizing Platinum Group Metal-Free Fuel Cell Catalysts by Rotating Disk ElectrodesDiana E. BeltránDiana BeltránDepartment of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United StatesMore Diana Beltrán and Shawn Litster*Shawn LitsterDepartment States*E-mail: [email protected]More Litsterhttp://orcid.org/0000-0003-1973-1834Cite this: ACS Energy Lett. 2019, 4, 5,...