Fuel cells & Hydrogen – Page 10

A Versatile Nanofabrication Technology for Polymer / Inorganic Composites for Fuel Cell and Pulse Power Applications

Lee S., Breitkopf R., Hwang J., Faguy P., Hunt A., MicroCoating Technologies, Inc., US

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 [...]

Proton Polarization on Pt Surface with Water Molecules

Yamamoto T., Ohnishi S., Watari N., NEC Fundamental Resreach Labs., JP

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 [...]

Influence of the Microstructure of the Catalyst Layer on the Performance of the PEMFC Cathode

Fontes E., Schumacher J., Vasileiades N., Parhammar O., Schmitz A., COMSOL Inc., US

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 [...]

Computational Modelling and Structural Studies of Perfluoro Sulfonate Ionomer Membranes

Elliott J.A., University of Cambridge, UK

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, [...]

Ab-initio Molecular Dynamics of CH3OH at the H2O/Pt interface

Mattsson T.R., Paddison S.J., Sandia National Laboratories, US

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 [...]

Voltage Current Curve of a PEM Fuel Cell

Kulikovsky A.A., Research Center - Juelich, DE

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 [...]

CFD-Based PEM Fuel Cell Models and Applications

Liu H., Zhou T., University of Miami, US

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 [...]

Mathematical Modeling of Water Management in PEM Fuel Cells

Berg P., Promislow K., Stockie J., Wetton B., Simon Fraser University, CA

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 [...]

PEM Fuel Cells

Paddison S., Los Alamos National Lab, US

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, [...]