Verification of the Durability of Graphite Composite Bipolar Plates in Single PEM Fuel Cells
| Autor: | Gonzalo Alfonso Almeida Pazmino, 艾梅達 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Bipolar plate is one of the most important components of the fuel cell from the fact that it contributes the majority of the cost and weight of PEM fuel cell. Durability and cost have been the two main challenges for fuel cell technology to be used in the energy market. The term of durability is related to the ability of the PEM fuel cell to resist permanent decrease in performance over time, which is not recoverable and reversible. The bipolar plates make connections all over the surface of one cathode in a cell and the anode of the next cell, serve as a means of feeding oxygen to the cathode and fuel gas to the anode, conduct the electronic current between two cells, separate the gases and contain the flow patterns both for the reactants and for the coolant, facilitate water management within the cell, enable heat transfer, and constitute the backbone of a power stack. The bipolar plate materials require multiple properties to be acceptable, such as high electrical conductivity, low gas permeability, high corrosion resistance, sufficient strength, low thermal resistance, low cost, etc. Graphite composites have attractive characteristics to be used in bipolar plates, such as the combination of high corrosion and chemical resistance, low density, and high electrical and thermal conductivity. However, they have unfavorable disadvantages when compared to metals, their durability under shock and vibration, permeability to hydrogen, and manufacturability, they need an increase in weight and volume to overcome their deficiencies. This research consist in testing the durability of graphite composites bipolar plates in three single PEM fuel cells, and comparing them with commercial graphite bipolar plates in a single PEM fuel cell, under constant current ageing mode and at the same operation conditions in a fuel cell test stand. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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