2024-03-29T11:05:35Zhttps://repositori.uji.es/oai/requestoai:repositori.uji.es:10234/1816022024-02-15T11:55:50Zcom_10234_2507com_10234_9col_10234_6973
00925njm 22002777a 4500
dc
Barjola, Arturo
author
Escorihuela, Jorge
author
Andrio, Andreu
author
Giménez, Enrique
author
Compañ, Vicente
author
2018
The zeolitic imidazolate frameworks (ZIFs) ZIF-8, ZIF-67, and a Zn/Co bimetallic mixture
(ZMix) were synthesized and used as fillers in the preparation of composite sulfonated poly(ether
ether ketone) (SPEEK) membranes. The presence of the ZIFs in the polymeric matrix enhanced
proton transport relative to that observed for SPEEK or ZIFs alone. The real and imaginary parts
of the complex conductivity were obtained by electrochemical impedance spectroscopy (EIS), and
the temperature and frequency dependence of the real part of the conductivity were analyzed. The
results at different temperatures show that the direct current (dc) conductivity was three orders of
magnitude higher for composite membranes than for SPEEK, and that of the SPEEK/ZMix membrane
was higher than those for SPEEK/Z8 and SPEEK/Z67, respectively. This behavior turns out to be
more evident as the temperature increases: the conductivity of the SPEEK/ZMix was 8.5 × 10−3
S·cm−1
, while for the SPEEK/Z8 and SPEEK/Z67 membranes, the values were 2.5 × 10−3 S·cm−1
and 1.6 × 10−3 S·cm−1
, respectively, at 120 ◦C. Similarly, the real and imaginary parts of the complex
dielectric constant were obtained, and an analysis of tan δ was carried out for all of the membranes
under study. Using this value, the diffusion coefficient and the charge carrier density were obtained
using the analysis of electrode polarization (EP).
Barjola, A.; Escorihuela, J.; Andrio, A.; Giménez, E.; Compañ, V. Enhanced Conductivity of Composite Membranes Based on Sulfonated Poly(Ether Ether Ketone) (SPEEK) with Zeolitic Imidazolate Frameworks (ZIFs). Nanomaterials 2018, 8, 1042.
2079-4991
2079-4991
http://hdl.handle.net/10234/181602
http://dx.doi.org/10.3390/nano8121042
proton exchange membrane
sulfonated poly(ether ether ketone)
zeolitic imidazoleate framework
proton conduction
Enhanced Conductivity of Composite Membranes Based on Sulfonated Poly(Ether Ether Ketone) (SPEEK) with Zeolitic Imidazolate Frameworks (ZIFs)