Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Fuel cell stacks"”.
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Electrochemical impedance spectroscopy of proton exchange membrane fuel cell stacks
… Spectroscopy (EIS) is applied to a small, four cell Proton Exchange Membrane (PEM) fuel cell stack to examine the stack response as the load current changes. The measured stack response is compared to a simulated response generated by a stack model that has been developed using MATLAB. The …
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Investigation of Graphite Bipolar Plates for PEM Fuel Cell Performance
The largest cost in manufacturing PEM fuel cells for automotive applications is due to the bipolar plate. The current graphite material used for the bipolar plate is very brittle and difficult to machine to the rigorous specifications needed for fuel cell stacks. This paper introduces the …
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INTELLIGENT FAULT DETECTION AND ISOLATION FOR PROTON EXCHANGE MEMBRANE FUEL CELL SYSTEMS
… is used to model the proton exchange membrane fuel cell nonlinear systems using a multi-input multi-output structure. This research proposed the use of radial basis function network and multilayer perceptron network to perform fault detection. After training, the neural network models can give …
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Health conscious energy management strategies for fuel cell/battery hybrid vehicles
… climate change to provide a sustainable future. Fuel cell vehicles can reduce emissions for the transportation sector as their only by-product is water. One major barrier towards commercialization is the cost of fuel cell stacks. Extending the operating life of fuel cells can lower their overall …
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Design and performance of a prototype borohydride fuel cell and control system
A direct borohydride fuel cell stack with a novel integrated manifold, along with a control system, was designed, manufactured and studied. Two fuel cell stacks were built and demonstrated. The main objective was to build these stacks to achieve a power level of 100 watts. The control system was …
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Evaluation of Novel and Low-Cost Materials for Bipolar Plates in PEM Fuel Cells
… the total cost in a polymer electrolyte membrane fuel cell stack. In an attempt to reduce these costs, a novel manufacturing method was developed for use with composite materials. Conductive fillers were mixed with a polypropylene binder and molded into single cell monopolar plates. A fuel cell …
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Experimental Evaluation of the Effect of Inlet Gas Humidification on Fuel Cell Performance
The development and evaluation of a fuel cell test stand incorporating various methods for controlling the temperature and humidity of fuel cell reactants is described. The test stand is capable of accurately metering gas flows, controlling the temperature and humidity of the gases, and delivering …
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Two-Loop Controller for Maximizing Performance of a Grid-Connected Photovoltaic-Fuel Cell Hybrid Power Plant
… in a stand-alone or grid-connected mode. First, fuel cells for a backup of varying PV power were compared in detail with batteries and were found to have more operational benefits. Next, maximizing performance of a grid-connected PV-fuel cell hybrid system by use of a two-loop controller was …
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Enhanced performance and durability of shape-controlled octahedral PtNiX catalysts for advanced fuel cell applications
… emphasizing the urgent need to shift from fossil fuels to more sustainable energy alternatives such as “green” hydrogen. Hydrogen fuel cell technologies are attractive as zero-emission solutions in transportation and other power sectors. However, the wider adoption of hydrogen fuel cells is …
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Manufacturing all-polymer laminar flow-based fuel cells
… for two applications: (i) laminar flow-based fuel cells (LFFCs) and (ii) electrohydrodynamic-jet (e-jet) printing. Most LFFCs presented to date have been proof-of-concept unit cells that are not commercially viable for portable electronic applications. Transitioning from proof-of-concept, …
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Feasibility analysis of polymer electrolyte fuel cells for residential cogeneration applications in Australia
… implementation of the PEFC (Polymer Electrolyte Fuel Cell) stacks for Distributed generation in Australia. The disposition of the thesis starts with an introductory background that highlights the need for a distributed energy system where Hydrogen acts as the main energy source. Subsequently a …
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Investigation of Novel Gas Diffusion Media for Application in Pem Fuel Cell Ribbon Assemblies
A new type of fuel cell architecture, the fuel cell ribbon, is presented. The fuel cell ribbon architecture relies on the gas diffusion layer (GDL) to conduct electrical current in-plane to adjacent cells or collector terminals. The potential advantages of the fuel cell ribbon architecture with …