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Development of membrane materials for direct methanol fuel cells

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Development of membrane materials for direct methanol fuel cells ( development-membrane-materials-direct-methanol-fuel-cells )

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Chapter 1 Introduction work as a current collector for the electrons released in the second layer of the MEA, the anode catalyst (Pt-Ru). The catalyst in this layer accelerates the decomposition of the fuel into electrons, protons and combustion prod- ucts, usually CO2. The anode half reaction for a DMFC is given in Equation 1 [1, 2, 4]: CH3OH + H2O ↔ CO2 + 6H+ + 6e- (1) Figure 1. Schematic drawing of a direct methanol fuel cell. The released protons diffuse through the electrolyte, the third layer. Be- cause this layer is non conductive for electrons, the electrons must be transported externally through electrical wires. At the cathode catalyst, the fourth layer, the protons and electrons react with oxygen to form water, as can be seen in Equation 2. This reaction is usually accelerated by the cata- lyst platinum (Pt). 32 O2 + 6H+ + 6e- ↔ 3H2O (2) 4

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