SULFONATED POLYETHERETHERKETONE
COMPOSITE MEMBRANES FOR FUEL
CELLS APPLICATIONS
C. Baicea, S.I. Voicu, V.I. Luntraru, O. Gales
Universitatea Politehnica Bucuresti, Facultatea de Chimie Aplicata si Stiinta Materialelor
a
a
CONCLUSIONS
0.05
0.10
Absorbance Units
0.15
0.20
0.25
0.30
Figure 1. SEM images of sPEEK/Ppy (a) and sPEEK/PANi (b) composite membranes.
3500
3000
2500
2000
Wavenumber cm-1
1500
1000
3500
3000
2500
2000
Wavenumber cm-1
1500
1000
b
0.1
0.2
Absorbance Units
0.3
0.4
0.5
CHARACTERIZATION
b
sPEEK
composite
membranes:
polyetheretherketone (M = 150000 g/mol) was
disolved in sulfuric acid H2SO4 96% (5% wt.)
and the membranes were obtained by the
phase inversion process from the sPEEK
solution. Pyrrole, respectively aniline, were
sprayed on the support membranes which were
then immersed in a polymerization bath with a
FeCl3 solution , respectively FeCl3, HCl and
water;
- functionalization of conductive polymers:
solutions of Ce(SO4)2 and FeCl3, respectively
poly-styrene sulfonic acid were used.
SYNTHESIS
INTRODUCTION: The increase of energy consumption and
the problem of environmental protection represent enough
reasons for new energy sources with a lower impact for
environment. The fuel cells devices respond to these requests,
due to their emissions and better yields. The synthesis and
characterization of two different composite membranes,
sulfonated polyetheretherketone-polypyrrole and sulfonated
polyetheretherketone-polyaniline are presented.
Figure 2. FT-IR spectrum of sPEEK/Ppy composite membrane
functionalized with Ce(SO4)2 (a) and sPEEK/PANi composite membrane
functionalized with poly-styrene sulfonic acid (b).
Table 1. The capacitance and ionic conductivity of sPEEK/Ppy and
sPEEK/PANi composite membranes.
The membranes were synthesized by in situ
polymerization of polypyrrole, respectively
polyaniline, on the sPEEK membrane also obtained
by phase inversion process. The polymerization of
the conductive polymers can be observed from the
SEM microscopy and FT-IR spectroscopy. In the
FT-IR spectrum of the functionalized composite
membranes the specific bands for sPEEK (the peak
at 1250 cm-1 attributed to the etheric bond (C-OC), the peak at 1640 cm-1 attributed to conjugated
ketonic bond (C=O)), Ppy (the peak at 880 cm-1
attributed to =C– bond outside the vibration plane
and the large band from 3310 to 3350 cm-1 given
by the secondary N-H stretch vibration),
respectively PANi (the peak at 1523 and 1485 cm-1
due to the presence of quinoid and benzenoid
rings) can be observed. To evaluate the ionic
conductive properties Electrochemical Impedance
Spectroscopy analyses were performed.
ACKNOWLEDGMENT: The work has been funded by the Sectorial Operational Programme Human Resources Development 2007-2013 of the Romanian Ministry of Labour,
Family and Social Protection through the Financial Agreement POSDRU/88/1.5/S/60203 (project that financed Cristina Baicea) and POSDRU/88/1.5/S/61178 (project that
financed Vlad Ionut Luntraru). Authors also recognise financial support from the European Social Fund through POSDRU/89/1.5/S/54785 project: "Postdoctoral Program for
Advanced Research in the field of nanomaterials” (project that financed Stefan Ioan Voicu).
A 10-a editie a
Seminarului National de nanostiinta si nanotehnologie
18 mai 2011
Biblioteca Academiei Romane