By Felix N. Büchi, Minoru Inaba, Thomas J. Schmidt
A significant a part of the competitiveness hole of polymer electrolyte gas cellphone (PEFC) know-how in automobile and desk bound co-generation purposes is due loss of sturdiness. This ebook analyzes the appropriate degradation procedures in PEFC at the point of elements, cells and stacks, and functions. favorite authors from the PEFC box describe and study in 23 chapters the proper degradation mechanisms and mitigation strategies.
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Additional info for Polymer Electrolyte Fuel Cell Durability
2001). As can be seen from Table 1 under open circuit voltage (OCV) conditions, H2 or O2 cannot directly attack the membrane in the absence of a platinum catalyst. Even in the presence of platinum, significant membrane degradation is not observed when the membrane is exposed to a single type of gas (H2 or O2). It is also found that adsorbed oxygen species, in the form of electrochemically generated PtO, do not lead to membrane chemical degradation, even with the presence of H2 gas. It can be concluded that H2 and O2 molecules have to react on a catalytic surface (Pt in this case) to introduce membrane chemical degradation.
Soc. 154(7), B631. , and Kinoshita, K. (1992) The influence of Pt on the electrooxidation behavior of carbon in phosphoric acid, Electrochim. Acta, 37, 2725. W. M. (2006) Damage to the cathode catalyst of a PEM fuel cell caused by localized fuel cell starvation. Electrochem. , 9(4), A183. , and Reiser, C. , 3(1), 783. P. , 1(8), 67. D. (2005) A reverse-current decay mechanism for fuel cells. Electrochem. , 8(6), A273. , and Wise, H. (1974) Carbon gasification in the presence of metal catalysts, Fuel, 53, 274.
15, comparing the corrosion rates of Black Pearls, Ketjenblack, and Vulcan XC-72C carbon blacks catalyzed with approximately 50 wt% platinum, tested in 50-cm2 single cells operated with N2 (working electrode) and H2 (counter/reference electrode). Analogous to what was observed in Fig. 2 and consistent with the literature (Kinoshita and Bett 1973), the carbon corrosion rates decrease with time, following a power-law behavior with very similar time dependence. The carbon corrosion rates of these three types of MEAs were in the order Pt/Black Pearls > Pt/Ketjenblack > Pt/Vulcan XC-72C.