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Open AccessArticle

Enhanced Conductivity of Composite Membranes Based on Sulfonated Poly(Ether Ether Ketone) (SPEEK) with Zeolitic Imidazolate Frameworks (ZIFs)

1
Escuela Técnica Superior de Ingenieros Industriales, Departamento de Termodinámica Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46020 Valencia, Spain
2
Departamento de Física Aplicada, Universitat Jaume I, Avda. Sos Baynat, s/n, 12080, Castelló de la Plana, Spain
3
Instituto de Tecnología de Materiales, Universitat Politècnica de València, Camino de Vera s/n, 46020 Valencia, Spain
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(12), 1042; https://doi.org/10.3390/nano8121042
Received: 23 November 2018 / Revised: 6 December 2018 / Accepted: 7 December 2018 / Published: 13 December 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). View Full-Text
Keywords: proton exchange membrane; sulfonated poly(ether ether ketone); zeolitic imidazoleate framework; proton conduction proton exchange membrane; sulfonated poly(ether ether ketone); zeolitic imidazoleate framework; proton conduction
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MDPI and ACS Style

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.

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