کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7720519 | 1497503 | 2014 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A vibrational spectroscopic and modeling study of poly(2,5-benzimidazole) (ABPBI) - Phosphoric acid interactions in high temperature PEFC membranes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: A vibrational spectroscopic and modeling study of poly(2,5-benzimidazole) (ABPBI) - Phosphoric acid interactions in high temperature PEFC membranes A vibrational spectroscopic and modeling study of poly(2,5-benzimidazole) (ABPBI) - Phosphoric acid interactions in high temperature PEFC membranes](/preview/png/7720519.png)
چکیده انگلیسی
This paper reports a FT-ATR-IR spectroscopic study on proton conducting poly(2,5-benzimidazole) (ABPBI) membranes doped with orthophosphoric acid. The analysis of the vibrational profiles is a good diagnostic tool to help understand the interactions occurring between the phosphoric acid and the polymer membranes. The experimental data show evidence that an acid-base proton exchange reaction has occurred between the imidazole moieties in the polymer chain and phosphoric acid to produce dihydrogen phosphate ions and protonated imidazolium cations in ABPBIn+. Vibrational modes associated with the dihydrogen phosphate ions are evident in the FT-IR spectra at lower doping levels and then become partially masked by the large amount of free phosphoric acid at high acid concentrations. Several bands in the FT-IR and FT-Raman spectra attributed to mixed modes containing varying contributions from NH bending motions exhibit high frequency shifts upon protonation the imidazole moieties. The correlatively assigned experimental vibrational bands were compared with calculated normal modes for small molecule models. The optimized geometry of the benzimidazolium dimer suggests that protonation of ABPBI results in a perturbation of the extended conjugated Ï system and allows rotation of the benzimidazole monomer units along the polymer chain. The results described here provide insight into the roles of phosphoric acid and ABPBI in the conduction mechanism of polybenzimidazole systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 6, 14 February 2014, Pages 2776-2784
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 6, 14 February 2014, Pages 2776-2784
نویسندگان
Guinevere A. Giffin, Fosca Conti, Sandra Lavina, Anne Majerus, Giuseppe Pace, Carsten Korte, Werner Lehnert, Vito Di Noto,