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An innovative method of modeling direct methanol fuel cells

Trendewicz A., Milewski J.

Journal of Power Technologies

2012

Vol. 92, nr 1

20-26

In this paper a computer model of a direct methanol fuel cell (DMFC) was presented. Chemical reactions of methanol oxidation and oxygen reduction were modeled with HYSYS software. Obtained results were used to evaluate the maximum cell voltage and limiting current density for the investigated fuel cell. An equivalent electric circuit was used for computing cell voltage after accounting for ohmic losses and methanol crossover losses. A simulation of a polarization curve for a cell supplied with 0.5 mole/dm3 methanol and pure oxygen operating at 70°C was performed and validated with experimental data. The effects of cathode gas humidification and methanol concentration change in therange of 0.5 mole/dm3-3 mole/dm3 on cell performance were investigated. Difficulties with evaluating methanol oxidation rate and methanol crossover loss numerical values were encountered. Experimental data were used to find these values. This procedure greatly reduced the range of model's applicability. Proposed metho methanol fuel cells had intrinsic challenges. The ways to tackle them were described.

Development in methanol fuel cell technology.

Połtarzewski Z., Wieczorek W., Bieliński J., Arico A.

Prace Naukowe Instytutu Chemii i Technologii Nafty i Węgla Politechniki Wrocławskiej. Konferencje

1999

Vol. 9, nr 56

445-447

The performance of the mathanol fuel cell with different construction of electrodes and membrane types was investigated. The carbon powders mixed with Pt catalyst and Nafion-like proton conducting polymer were used as the basic components of the electrode systems. The Nafion and other synthetised polymers were used as the fuel cell membranes. The cell was supplied with the methanol - water gaseous mixture and oxygen, respectively to the anode and cathode compartments. The cell components and the work of the particular cell were characterized by the cell current density - voltage characteristics and by the power output in function of methanol flow and cell temperature. The conditions for the best cell performance were presented and discussed.

Wykonano badania ogniwa paliwowego z bezpośrednim utlenianiem metanolu dla różnych mambran stałych elekrolitów polimerowych i różnych konstrukcji elektrod. Jako podstawowe materiały układu ogniwa stosowano proszki węglowe, zmieszane z katalizatorem platynowym oraz polimery protonowo przewodzące. Jako membranę - elektrolt w ogniwie, stosowano Nafion oraz inne polimery syntetyczne. Ogniwo było zasilane gazową mieszaniną metanolu i wody (anoda) oraz tlenu (katoda). Praca poszczególnych ogniw i ich części składowych była charakteryzowana przez zależności napięcia ogniwa, gęstości prądu i gęstości mocy w funkcji przepływu reagentów i temperatury. Przedstawiono warunki dla optymalnej pracy badanego ogniwa metanolowego.