One fundamental component of a fuel cell is the electrolyte, which separates the electrocatalytic active sites of the two electrode configurations. Phosphoric acid-doped poly(2,2’-(m-phenylene)-5,5’-bibenzimidazole) (PBI) polymers have been studied as membrane materials for the use in High Temperature Polymer Electrolyte Fuel Cells (HT-PEFC), since they can be used at temperatures as high as 200 °C without humidification. Among the many possible PBI derivatives, a very promising material is poly(2,5-benzimidazole) (AB-PBI). [1-4] In the present study, we report on a FT-Raman investigation of AB-PBI polymer membranes doped with various concentrations of ortho-phosphoric acid. Characteristic Raman spectra with three diagnostic regions and specific peaks have been studied. The information is of fundamental importance in order to elucidate the role of phosphoric acid in the conductivity mechanism of AB-PBI. [5] Reference: [1] J. N. Asensio, E. M. Sánchez and P. Gómez- Romero, Chem. Soc. Rev., 2010, 39, 3210-3239. [2] C. Wannek, B. Kohnen, H.-F. Oetjen, H. Lippert and Mergel J., Fuel Cell, 2008, 8, 87-95. [3] C. Wannek, W. Lehnert and J. Mergel, J. Power Sources, 2009, 192, 258-266. [4] K. Wippermann, C. Wannek, H.-F. Oetjen, J. Mergel and W. Lehnert, J. Power Sources, 2010, 195, 2806-2809. [5] F. Conti, A. Majerus, V. Di Noto, C. Korte, W. Lehnert, D. Stolten, Phys. Chem. Chem. Phys., 2012, 14, 10022-10026.
Diagnostic Raman signals of the interaction polybenzimidazole – phosphoric acid in membrane for Fuel Cells
CONTI, FOSCA;DI NOTO, VITO;
2012
Abstract
One fundamental component of a fuel cell is the electrolyte, which separates the electrocatalytic active sites of the two electrode configurations. Phosphoric acid-doped poly(2,2’-(m-phenylene)-5,5’-bibenzimidazole) (PBI) polymers have been studied as membrane materials for the use in High Temperature Polymer Electrolyte Fuel Cells (HT-PEFC), since they can be used at temperatures as high as 200 °C without humidification. Among the many possible PBI derivatives, a very promising material is poly(2,5-benzimidazole) (AB-PBI). [1-4] In the present study, we report on a FT-Raman investigation of AB-PBI polymer membranes doped with various concentrations of ortho-phosphoric acid. Characteristic Raman spectra with three diagnostic regions and specific peaks have been studied. The information is of fundamental importance in order to elucidate the role of phosphoric acid in the conductivity mechanism of AB-PBI. [5] Reference: [1] J. N. Asensio, E. M. Sánchez and P. Gómez- Romero, Chem. Soc. Rev., 2010, 39, 3210-3239. [2] C. Wannek, B. Kohnen, H.-F. Oetjen, H. Lippert and Mergel J., Fuel Cell, 2008, 8, 87-95. [3] C. Wannek, W. Lehnert and J. Mergel, J. Power Sources, 2009, 192, 258-266. [4] K. Wippermann, C. Wannek, H.-F. Oetjen, J. Mergel and W. Lehnert, J. Power Sources, 2010, 195, 2806-2809. [5] F. Conti, A. Majerus, V. Di Noto, C. Korte, W. Lehnert, D. Stolten, Phys. Chem. Chem. Phys., 2012, 14, 10022-10026.
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