Durability radiation-grafted membranes

Gode, P. Ihonen, J. Strandroth, A. Ericson, H. Lindbergh, G. Paronen, M. Sundholm, F. Sundhohm, G. Walsby, N. Membrane durability in a PEM fuel cell studied using PVDF based radiation grafted membranes. Fuel Cells 2003, 3 (1-2), 21-27. 

P. Gode, J. Ihonen, A. Strandroth, H. Ericson, G. Lindbergh, M. Paronen, F. Sundholm, G. Sundholm and N. Walsby, Membrane durability in a proton exchange membrane fuel cell studied using PVDF based radiation-grafted membranes. Fuel Cells 3, 21 (2003). 

Fig. 8 Evolution of performance and durability of FEP-based radiation-grafted membranes at the Paul Scherrer Institut, expressed through ohmic (i.e., membrane) resistance, recorded on-line using the auxiliary current-pulse method...

Gubler L, Scherer GG (2008) Durability of radiation grafted fuel cell membranes. In Inaba M, Schmidt TJ, Buchi FN (eds) Proton exchange fuel cells durability. Springer,... 

Most of the commonly used membranes used in DMFC exhibit acceptable performance stability after thousands of hours under steady-state operation, including perfluorinated sulfonic acid, PTFE-co-HFP radiation-grafted poly- styrenes, and sPAE [85]. However, membrane durability results under unsteady-state operation are stUl scarce. Siroma et al. [114] have shown that a significant fraction of Nation dissolved after 1 week of DMFC operation with methanol solution. 

Gubler L, Kuhn H, Schmidt T J, Scherer G G, Brack H P ef al. (2004), Performance and durability of membrane electrode assemblies based on radiation-grafted FEP-g-polystyrene membranes ,F e/ Cells, 4,196-207. DOI 10.1002/fuce.200400019. 

Similar to pure hydrocarbon membranes discussed previously, both the aromatic rings and the SOj" groups are lost after the durability test (Yu et al. 2003). No preferential cleavage of sulfonic acid groups was observed. On the basis of XPS results, it also is found that chemical degradation during fuel cell operation occurs mainly on the hydrocarbon fraction of the radiation-grafted ionomer membranes (Nasef and Saidi 2002). Thus, the hydrocarbon fraction has less chemical stability than the fluorinated part. 

Durability of Radiation-Grafted Fuel Cell Membranes... 

Gubler, L. and Scherer, G.G. (2006) Fuel cell durability of the radiation grafted PSl membrane under high H /Oj pressure and dynamic operating conditions. PSl Electrochemistry Laboratory - Annual Report 2006, 19. 

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