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Direct Methanol Fuel Cell (DMFC) Performance

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Direct Methanol Fuel Cell (DMFC) Performance ( direct-methanol-fuel-cell-dmfc-performance )

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Electrons are collected by graphite bipolar plates which are the two poles of the cell. The structure of the cell is described in Figure 1. e- Load Catalyst i CO2 H2O H+ H2O ANODE Bipolar plate CATHODE Bipolar plate b. Reactions Anode reaction: Cathode reaction: Overall reaction: Figure 1: DMFC principle scheme CH3OH + 7H2OCO2 + 6H3O+ + 6e- 3/2O2 + 6H3O+ + 6e- 9H2O CH3OH + 3/2O2 CO2 + 2H2O E0=0.02V E0=1.23V E0=1.21V MeOH + H2O Membrane (Nafion) Gas diffusion layer O2 At anode, the methanol is oxidized into carbon dioxide and six protons (as hydronium ions) plus six electrons. The six protons formed react at the cathode with oxygen to form water. The overall reaction looks like a combustion reaction and is thus sometimes referred to as cold combustion. Actually the cell is a mean to control this reaction and use it to produce current directly. - 17 -

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