The generation performance of a direct DME fuel cell is compared to that of hydrogen-oxygen, methanol-oxygen and hydrogen-air in common fuel cells, under the same operation temperature (80 deg C) and pressures. The comparison showed that the performance of the direct DME fuel cell is about half that of a direct methanol fuel cell and about quarter that of a hydrogen fuel cell. The reasons for deteriorated performance of the DME fuel cell were then analyzed usind a simple model. The main reason was found to be dryness of the membrane. A DME fuel cell operating at an increased temperature of 130 deg C and a pressure of 4.5atm shows a comparable performance to that of a methanol fuel cell. The results obtained in this study using DME as a fuel for direct fuel cells are listed as follows: (1) Direct DME cells and direct methanol fuel cells show the same generation performance in spite of the state of the fuel (liquid or gaseous phase). (2) The performance of direct methanol fuel cells is about half that of hydrogen fuel cells, and that of direct DME fuel cells is half that of methanol direct fuel cells at the same operating temperature of 80 deg C and atmospheric pressure. (3) The quantity of water at the anode reaction for direct DME fuel cells requires a temperature of 92 deg C, and 82 deg C for direct methanol fuel cells at atmospheric operating pressure. (4) Based on previous results, elevated operating pressures and temperatures, namely 0.45MPa and 130 deg C, for direct DME fuel cells result in a generation performance equivalent to direct methanol fuel cells. (5) Therefore, the MEA for direct DME fuel cells should be operated at higher pressures and temperatures than with methanol fuel cells. The target pressure and temperature should be over 0.45MPa and 130 deg C.
Fundamental study of direct dimethyl ether fuel cells
Grundsatzuntersuchung von direkten Dimethylether-Brennstoffzellen
Review of Automotive Engineering (JSAE) ; 27 , 3 ; 409-415
2006
7 Seiten, 17 Bilder, 5 Tabellen, 8 Quellen
Article (Journal)
English
Anwendung im Fahrzeugbau , Anwendung im Motorenbau , Untersuchung (Studie) , Betriebstemperatur , Trend (Entwicklung) , Betriebsverhalten , Betriebsdruck , theoretisches Modell , Membran , Trockenheit , Temperaturbereich , Methanolzelle , Wasserstoffzelle , Dieselmotor , Kraftfahrzeugmotor , Cetanzahl , Abgasrückführung
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