Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells

Kurapova, Olga Yu.; Faia, Pedro M.; Zaripov, Artem A.; Pazheltsev, Vasily V.; Glukharev, Artem A.; Konakov, Vladimir G.

doi:10.3390/app112411877

Open AccessArticle

Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells

by

Olga Yu. Kurapova

^1,*

,

Pedro M. Faia

^2,*

,

Artem A. Zaripov

¹,

Vasily V. Pazheltsev

¹,

Artem A. Glukharev

¹

and

Vladimir G. Konakov

³

¹

Institute of Chemistry, Department of Physical Chemistry, Saint Petersburg State University, Universitetskya Nab. 7/9, 199034 St. Petersburg, Russia

²

Center of Mechanical Engineering, Materials and Processes, Electrical and Computer Engineering Department, Faculty of Sciences and Technology, University of Coimbra, Polo 2, Pinhal de Marrocos, 3030-290 Coimbra, Portugal

³

Institute of Chemistry, Peter the Great Saint Petersburg Polytechnic University, 29 Polytechnicheskaya Str., 195251 St. Petersburg, Russia

^*

Authors to whom correspondence should be addressed.

Appl. Sci. 2021, 11(24), 11877; https://doi.org/10.3390/app112411877

Submission received: 18 November 2021 / Revised: 7 December 2021 / Accepted: 10 December 2021 / Published: 14 December 2021

(This article belongs to the Special Issue Technology and Application of Electrochemical Impedance Spectroscopy)

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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.

Keywords: proton conductivity; polyantimonic acid; ion-conducting membranes; impedance spectroscopy

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MDPI and ACS Style

Kurapova, O.Y.; Faia, P.M.; Zaripov, A.A.; Pazheltsev, V.V.; Glukharev, A.A.; Konakov, V.G. Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells. Appl. Sci. 2021, 11, 11877. https://doi.org/10.3390/app112411877

AMA Style

Kurapova OY, Faia PM, Zaripov AA, Pazheltsev VV, Glukharev AA, Konakov VG. Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells. Applied Sciences. 2021; 11(24):11877. https://doi.org/10.3390/app112411877

Chicago/Turabian Style

Kurapova, Olga Yu., Pedro M. Faia, Artem A. Zaripov, Vasily V. Pazheltsev, Artem A. Glukharev, and Vladimir G. Konakov. 2021. "Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells" Applied Sciences 11, no. 24: 11877. https://doi.org/10.3390/app112411877

APA Style

Kurapova, O. Y., Faia, P. M., Zaripov, A. A., Pazheltsev, V. V., Glukharev, A. A., & Konakov, V. G. (2021). Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells. Applied Sciences, 11(24), 11877. https://doi.org/10.3390/app112411877

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Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells

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