Water Management and Thermal Distribution Analyses of Graphite and PDMS Air-breathing PEMFC
|關鍵字:||PDMS;石墨;質子交換膜燃料電池;氫氣利用量;熱顯像儀;鎖合扭力;電池溫度;PDMS;Graphite;PEMFC;Hydrogen Utilization;Thermal Imaging Analyzer;Clamping Force;Cell Temperature|
This study fabricated PDMS (Polydimethyl Siloxane) and graphite PEMFC (Proton Exchange Membrane Fuel Cell). The active area of the membrane is 5cm×5cm. Firstly, a series of performance experiments on a single PDMS air-breathing PEMFC were carried out and demonstrated. The experimental parameters included flow rate with the corresponding hydrogen utilization and clamping force. Secondly, the similar performance experiments on single graphite air-breathing PEMFC were also carried out and illustrated. The experimental parameters consisted of flow rate, clamping force and cell temperature. For both experimental studies, the corresponding thermal imagines of resultant temperature distributions on the cathode surface were given as well. In addition, in order to justify the durability of continuous usage and water produced situation, both fuel cells mentioned above were tested for 24 hours at a fixed operating voltage. Finally, we made a comparison between PDMS and graphite PEMFCs to see the performance difference and the advantage. The experimental results show that both the performances of the single PDMS and graphite air-breathing PEMFC increase with an increase of flow rate, but have no further obvious improvements when the flow rates are greater than 60sccm and 40sccm, receptivity. The hydrogen utilization of the single PDMS PEMFC is 60sccm, and the corresponding thermal image show its temperature distribution being more uniform; An appropriate clamping torque should be considered carefully to enhance the performance without narrowing the fuel flow channels; The performance has significantly improved as increasing graphite fuel cell temperature, however, it starts to decrease as the cell temperature above 60℃; The single PDMS fuel cell can maintain a stable power output for a long time use up to 24 hours. One the contrary, the single graphite air-breathing PEMFC cannot, but it can maintain a stable power output when the cell temperature is raised to 60℃ manually; The PDMS PEMFC has a better performance than that of the graphite one under the same conditions and the same resistance; PDMS is a better material than graphite for air-breathing fuel cell because it has less water flooding effects and possesses a better performance.
|Appears in Collections:||Thesis|
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