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Title: Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells
Authors: Kurapova, Olga Yu.
Faia, Pedro M. 
Zaripov, Artem A.
Pazheltsev, Vasily V.
Glukharev, Artem A.
Konakov, Vladimir G.
Keywords: proton conductivity; polyantimonic acid; ion-conductingmembranes; impedance spectroscopy
Issue Date: 2021
Project: FCT UIDB/00285/2020 
Serial title, monograph or event: Applied Sciences (Switzerland)
Volume: 11
Issue: 24
Abstract: The development of novel proton-conducting membrane materials for electrochemical power units, i.e., low temperature fuel cells (FCs), efficiently working up to 300 C, is a critical problem related to the rapid shift to hydrogen energy. Polyantimonic acid (PAA) is characterized by high conductivity, sufficient thermal stability and can be regarded as a prospective proton-conducting material. However, the fabrication of bulk PAA-based membranes with high proton conductivity remains a challenging task. In the present work, for the first time, the authors report the investigation on proton conductivity of bulk PAA-based membranes in the temperature range 25–250 C, both in dry air and in moisturized air. Using PAA powder and fluoroplastic as a binder, fully dense cylindrical membranes were formed by cold uniaxial pressing. The structures of the PAA-based membranes were investigated by SEM, EDX, XRD and Raman techniques. STA coupled with in situ thermo-XRD analysis revealed that the obtained membranes corresponded with Sb2O5 3H2O with pyrochlore structure, and that no phase transitions took place up to 330 C. PAA-based membranes possess a high-grain component of conductivity, 5 10 2 S/cm. Grain boundary conductivities of 90PAA and 80PAA membranes increase with relative humidity content and their values change non-linearly in the range 25–250 C.
ISSN: 2076-3417
DOI: 10.3390/app112411877
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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