Enhanced Conductivity of Composite Membranes Based on Sulfonated Poly(Ether Ether Ketone) (SPEEK) with Zeolitic Imidazolate Frameworks (ZIFs)
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Otros documentos de la autoría: Barjola, Arturo; Escorihuela, Jorge; Andrio, Andreu; Giménez, Enrique; Compañ, Vicente
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Título
Enhanced Conductivity of Composite Membranes Based on Sulfonated Poly(Ether Ether Ketone) (SPEEK) with Zeolitic Imidazolate Frameworks (ZIFs)Fecha de publicación
2018Editor
MDPIISSN
2079-4991; 2079-4991Cita bibliográfica
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.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://www.mdpi.com/2079-4991/8/12/1042Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
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) ... [+]
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). [-]
Publicado en
Nanomaterials 2018, 8(12), 1042Proyecto de investigación
ENE/2015-69203-RDerechos de acceso
info:eu-repo/semantics/openAccess
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