Interplay between Composition, Structure, and Properties of New H3PO4-Doped PBI4N-HfO2 Nanocomposite Membranes for High-Temperature Proton Exchange Membrane Fuel Cells

被引：56
作者：
Nawn, Graeme [1 ]
Pace, Giuseppe [1 ,2 ]
Lavina, Sandra [1 ,3 ]
Vezzu, Keti [4 ]
Negro, Enrico [1 ,3 ]
Bertasi, Federico [1 ,2 ,3 ]
Polizzi, Stefano [3 ,5 ]
Di Noto, Vito [1 ,3 ]
机构：
[1] Univ Padua, Dipartimento Sci Chim, I-35131 Padua, Italy
[2] CNR IENI, I-35131 Padua, PD, Italy
[3] INSTM, Consorzio Interuniv Nazl Sci & Tecnolgia Mat, Florence, Italy
[4] Veneto Nanotech SCpa, I-35129 Padua, PD, Italy
[5] Univ Venice, Dipartimento Sci Mol & Nanosistemi, I-30123 Venice, VE, Italy
来源：
MACROMOLECULES | 2015年 / 48卷 / 01期
关键词：
POLYMER ELECTROLYTE MEMBRANES; CONDUCTING MEMBRANES; PHOSPHORIC-ACID; POLYBENZIMIDAZOLE; NAFION; BLENDS; TI;
D O I：
10.1021/ma5018956
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Polybenzimidazole (PBI) has become a popular polymer of choice for the preparation of membranes for potential use in high-temperature proton exchange membrane polymer fuel cells. Phosphoric acid-doped composite membranes of poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole] (PBI4N) impregnated with hafnium oxide nanofiller with varying content levels (0-18 wt %) have been prepared. The structureproperty relationships of both the undoped and acid-doped composite membranes are studied using thermogravimetric analysis, modulated differential scanning calorimetry, dynamic mechanical analysis, wide-angle X-ray scattering, infrared spectroscopy, and broadband electrical spectroscopy. Results indicate that the presence of nanofiller improves the thermal and mechanical properties of the undoped membranes and facilitates a greater level of acid uptake. The degree of acid dissociation within the acid-doped membranes is found to increase with increasing nanofiller content. This results in a conductivity, at 215 degrees C and a nanofiller level x = 0.04, of 9.0 x 10(-2) S cm(-1) for [PBI4N(HfO2)(x)](H3PO4)(y). This renders nanocomposite membranes of this type as good candidates for use in high temperature proton exchange membrane fuel cells (HT-PEMFCs).
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页码：15 / 27
页数：13
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