Papers:
PEM Fuel Cells
Micromachined pressure sensors have been reported since the late 1950’s. Their application to a wide variety of commercial products was largely completed by 1990. Nonetheless, there continues to be a commercial need for pressure sensors, [...]
Mathematical Modeling of Water Management in PEM Fuel Cells
Liquid water is fundamental to Polymer Electrolyte Membrane fuel cells (PEMFC). Its influence, both beneficial and parasitic, is measured on time scales from femto-seconds to hours, on length scales from Angstroms to centimeters. Its role [...]
CFD-Based PEM Fuel Cell Models and Applications
In recent years, various fuel cell models based on computational fluid dynamics (CFD) have been developed at the Fuel Cell Laboratory, University of Miami. These 2-or 3-dimensional models account for all the major transport phenomena [...]
Voltage Current Curve of a PEM Fuel Cell
First we consider 1D problem of the cathode catalyst layer (CCL) performance. The general solution is presented and simple analytical formulas for CCL polarization voltage are obtained. Based on these formulas we build a simple [...]
Ab-initio Molecular Dynamics of CH3OH at the H2O/Pt interface
Among the engineering achievements, including a reduction in the overall cost of the system, necessary for Direct Methanol Fuel Cells (DMFC) to become a competitive alternative for both portable and stationary power applications, are improved [...]
Computational Modelling and Structural Studies of Perfluoro Sulfonate Ionomer Membranes
Perfluoro sulfonate ionomer membranes (PIMs) consist of a Teflon (PTFE) backbone with sulfonic acid groups periodically substituted along the chain, and are of great commercial interest due to their peculiar ion transport properties. In particular, [...]
Influence of the Microstructure of the Catalyst Layer on the Performance of the PEMFC Cathode
This paper presents a model of a unit cell of a PEMFC for applications in portable electronic devices. The model introduces the transport resistance exerted by the electrolyte confined in the active layer using a [...]
Proton Polarization on Pt Surface with Water Molecules
We present theoretical studies of atomic and electronic structures calculations of hydrogen at Pt surfaces with H2O molecules by focusing on the mechanism of proton polarization in the fuel cells system by the density functional [...]
A Versatile Nanofabrication Technology for Polymer / Inorganic Composites for Fuel Cell and Pulse Power Applications
An innovative atomizer, capable of producing sub-micron size droplets, in conjunction with Combustion Chemical Vapor Deposition (CCVD), a flame based technique have demonstrated the capability to produce nanoscale hybrid materials with morphological, compositional and internal [...]
Carbon Supported Pt Nanomaterials for Fuel Cell Applications Using Combustion Chemical Vapor Condensation
PEM Fuel cells have enormous promise as the power source for next generation vehicles. Several missing pieces exist with state of the art technology that prevent immediate implementation due to cost constraints. One large cost [...]
Modeling Water Uptake of Proton Exchange Membranes
Water content in Nafion membranes of proton exchange membranes (PEM) is crucial to its functionality. The adsorption of liquid water occurs on a time scale of seconds, while the desorption (drying) time scale is on [...]
Electrical Potential Distribution in Nanopores
The study of the transport of ionic species through nanopores is a subject of wide interest covering several diverse fields such as biophysics, electrochemistry and polymer science. While, during recent decades, considerable advances have been [...]
Journal: TechConnect Briefs
Volume: 3, Technical Proceedings of the 2003 Nanotechnology Conference and Trade Show, Volume 3
Published: February 23, 2003
Industry sectors: Advanced Materials & Manufacturing | Energy & Sustainability
Topic: Fuel cells & Hydrogen
ISBN: 0-9728422-2-5