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By E. Morales

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The coated plates showed improved corrosion resistances in fuel cell environment. Best results for corrosion resistance (~350 mV vs. SCE) were achieved after the third deposition cycle. However with increasing of the thickness of the coating the corrosion potential decreased to ~120 mV vs. SCE. The contact resistance was higher for the PPy and PAni coated steel samples compared to the bulk substrate. PPy coatings were electro-polymerized by García et al. [25] and the corrosion properties under fuel cell conditions were investigated.

To investigate the durability of the metals Ziomek-Moroz [91] treated metal tubes in 99 % N2 and 1 % H2 for one year at temperatures of 600 °C, 700 °C and 800 °C analyzing the effects on the metal specimen afterwards. Direct methanol fuel cell (DMFC) Operating temperature Reacting agents Operating pressure 40 °C - 80 °C Air, methanol Ambient The DMFCs are mostly used for portable applications [23]. 5 M H2SO4 solution with 10 % methanol [47]. 3. Precious metals Precious metals such as platinum and gold provide excellent corrosion resistance as well as good electrical conductivity [37], [84].

At times where the demand for energy is high, the hydrogen can be used to supply fuel cells where it will be recombined with oxygen from the air generating electricity. Besides the stationary applications in combination with electrolyzer, fuel cells 30 Alloy Steel – Properties and Use operating on hydrogen are a promising option for the electrical energy supply for passenger cars with electrical drive trains and medium operating ranges. Due to their high power density and fast start-up time, proton exchange membrane fuel cells show highest potential for automotive applications [23].

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