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https://hdl.handle.net/10316/100911
Título: | Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells | Autor: | Kurapova, Olga Yu. Faia, Pedro M. Zaripov, Artem A. Pazheltsev, Vasily V. Glukharev, Artem A. Konakov, Vladimir G. |
Palavras-chave: | proton conductivity; polyantimonic acid; ion-conductingmembranes; impedance spectroscopy | Data: | 2021 | Projeto: | FCT UIDB/00285/2020 | Título da revista, periódico, livro ou evento: | Applied Sciences (Switzerland) | Volume: | 11 | Número: | 24 | Resumo: | 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. | URI: | https://hdl.handle.net/10316/100911 | ISSN: | 2076-3417 | DOI: | 10.3390/app112411877 | Direitos: | openAccess |
Aparece nas coleções: | I&D CEMMPRE - Artigos em Revistas Internacionais |
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Electrochemical-characterization-of-novel-polyantimonicacidbased-proton-conductors-for-lowand-intermediatetemperature-fuel-cellsApplied-Sciences-Switzerland.pdf | 6.37 MB | Adobe PDF | Ver/Abrir |
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