One fundamental component of a fuel cell (FC) is the electrolyte, which separates the electrocatalytic active sites of the two electrode configurations. 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 FCs. [1] In the present study, we report on a FT-Raman investigation of poly(2,5-benzimidazole) (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 [2]. Moreover, we present very recent NMR results on the PBI material [3]. The information is of fundamental importance in order to elucidate the role of H3PO4 in conductivity mechanisms in polybenzimidazoles. [1] J. N. Asensio, E. M. Sánchez and P. Gómez- Romero, Chem. Soc. Rev., 2010, 39, 3210-3239. [2] F. Conti, A. Majerus, V. Di Noto, C. Korte, W. Lehnert, D. Stolten, Phys. Chem. Chem. Phys., 2012, 14, 10022-10026. [3] F. Conti, S. Willbold, C. Korte, W. Lehnert, S. Mammi, D. Stolten Polymer, 2012, under review.
Spectroscopic Investigation of Acid Doped Polybenzimidazole as Electrolyte Membrane for Fuel Cells
CONTI, FOSCA;MAMMI, STEFANO;DI NOTO, VITO;
2012
Abstract
One fundamental component of a fuel cell (FC) is the electrolyte, which separates the electrocatalytic active sites of the two electrode configurations. 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 FCs. [1] In the present study, we report on a FT-Raman investigation of poly(2,5-benzimidazole) (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 [2]. Moreover, we present very recent NMR results on the PBI material [3]. The information is of fundamental importance in order to elucidate the role of H3PO4 in conductivity mechanisms in polybenzimidazoles. [1] J. N. Asensio, E. M. Sánchez and P. Gómez- Romero, Chem. Soc. Rev., 2010, 39, 3210-3239. [2] F. Conti, A. Majerus, V. Di Noto, C. Korte, W. Lehnert, D. Stolten, Phys. Chem. Chem. Phys., 2012, 14, 10022-10026. [3] F. Conti, S. Willbold, C. Korte, W. Lehnert, S. Mammi, D. Stolten Polymer, 2012, under review.
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