Fig. 8. Effect of the operating pressure on discharge characteristics. Fig. 9. Performance of the 5 cell stack. preliminary test was conducted by using a smaller single cell at various operating pressures as shown in Fig. 8 in order to investigate if the cell operated satisfactorily at the high pressure because the tests described in the above paragraphs were carried out at an atmospheric operating pressure. It was ascertained that the fuel cell operated satisfactorily and even with some voltage premium at the higher operating pressures.
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