Among a number of alternative energy sources, hydrogen is treated as one of the most promising candidates, due to the reason that it can be applied to a fuel cell as an input to provide electricity through an electrochemical reaction. On top of that, high conversion efficiency up to 40 to 60% is seen in a fuel cell. The first application of a Proton Exchange Membrane (PEM) fuel cell was as an a...

Among a number of alternative energy sources, hydrogen is treated as one of the most promising candidates, due to the reason that it can be applied to a fuel cell as an input to provide electricity through an electrochemical reaction. On top of that, high conversion efficiency up to 40 to 60% is seen in a fuel cell. The first application of a Proton Exchange Membrane (PEM) fuel cell was as an a...

Objectives • Demonstrate high performance desulfurizer, catalyst, micro-reactor and microcombustor/ microvaporizer concepts that will enable production of compact fuel processors for proton exchange membrane (PEM) fuel cells • Design, fabricate and evaluate a 1-kWe fuel-flexible fuel processor during the first 36 months (one of the fuels capable of being reformed will be EPA Phase II reformulat...

The mechanisms of fuel cell degradation are not well understood. Even though the numbers of installed units around the world continue to increase and dominate the pre-markets, the present lifetime requirements for fuel cells cannot be guarantee, creating the need for a more comprehensive knowledge of material’s ageing mechanism. In this work, failure modes and mechanism of the membrane-electrod...

Polymer electrolyte membranes (PEM) and Pt-based catalysts are two crucial components which determine the properties and price of fuel cells. Even though, PEM faces problem of fuel crossover in liquid fuel cells such as direct methanol fuel cell (DMFC) and direct borohydride fuel cell (DBFC), which lowers power output greatly. Here, we report a DBFC in which a polymer fiber membrane (PFM) was u...

In order to present a new and high performance structure of PEM fuel cell and study the influence of the flow direction and distribution on the rate of reactants diffusion, three novel models of vertical reactant flow injection into the anode and cathode reaction area field have been introduced. They consist of one inlet and two inlets and also a continuous channel. The governing equations on t...

Oxygen transport across the cathode gas diffusion layer (GDL) in polymer electrolyte membrane (PEM) fuel cells was examined by varying the O2/N2 ratio and by varying the area of the GDL extending laterally from the gas flow channel under the bipolar plate (under the land). As the cathode is depleted of oxygen, the current density becomes limited by oxygen transport across the GDL. Oxygen deplet...

in this study cross section geometry and material of gasket in proton exchange membrane (pem) fuel cells have been investigated to achieve optimized fuel cell in terms of energy efficiency. the role of gaskets in fuel cells is sealing of gas flow channels and preventing from combination of them. in a pem stack, gasket with approved geometry that suffers more stress has better sealing. for this ...

The paper presents a Supervision, Control, Data Acquisition and Simulation (SCADA & Simulator) system that allows for real-time training in the actual operation of a modular PEM fuel cell system. This SCADA & Simulator system consists of a free software tool that operates in real time and simulates real situations like failures and breakdowns in the system. This developed SCADA & Simulator syst...

Proton-exchange membrane (PEM) fuel cells are being developed for both automotive (motive and/or auxiliary) and stationary (residential) power applications. Solid oxide fuel cells (SOFCs) also are being pursued for a number of power generation applications, including stationary (residential and utility), and automotive (auxiliary) power sources. For both of these types of fuel cells, the use of...