Effect of filler surface functionalization on the performance of Nafion/Titanium oxide composite membranes

被引：34
作者：
de Bonis, Catia [1 ]
Cozzi, Dafne [1 ]
Mecheri, Barbara [1 ]
D'Epifanio, Alessandra [1 ]
Rainer, Alberto [2 ]
De Porcellinis, Diana [1 ]
Licoccia, Silvia [1 ]
机构：
[1] Univ Roma Tor Vergata, Dept Chem Sci & Technol, I-00133 Rome, Italy
[2] Univ Campus Biomed Rome, Integrated Res Ctr, Lab Chem & Biomat, I-00128 Rome, Italy
来源：
ELECTROCHIMICA ACTA | 2014年 / 147卷
关键词：
Organically functionalized metal oxides; proton exchange membranes; direct methanol fuel cells; FUEL-CELL APPLICATIONS; POLYMER ELECTROLYTE MEMBRANES; PROTON-EXCHANGE MEMBRANES; SULFONIC-ACID; CONDUCTING MEMBRANES; MESOPOROUS SILICA; NAFION; WATER; NANOPARTICLES; OPERATION;
D O I：
10.1016/j.electacta.2014.09.135
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The phenylsulfonic functionalized nanometric titania (TiO2-PhSO3H) was synthesized to be used as filler in Nafion-based composite membranes for direct methanol fuel cell (DMFC) applications. The organic moieties were covalently bound on the surface of TiO2 nanoparticles and the hybrid product was characterized by Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric and differential thermal analysis (TG/DTA), field emission scanning electron microscopy (FE-SEM), and X-ray diffraction (XRD) analysis. TiO2-PhSO3H showed higher ion exchange capacity (IEC) and proton conductivity values with respect to those of TiO2. The incorporation of TiO2-PhSO3H in Nafion led to a mechanical reinforcement of the membranes and higher conductivity than that obtained with unfilled Nafion. The composite membrane containing 10 wt.% of TiO2-PhSO3H showed an increased crystallinity and the highest conductivity, reaching 0.11 S cm(-1) at 140 degrees C. DMFC tests were carried out showing that the use of the organic-inorganic hybrid filler leads to a general improvement in the cell performance, in terms of higher current and power density and reduced methanol crossover. (C) 2014 Elsevier Ltd. All rights reserved.
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页码：418 / 425
页数：8
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