Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells
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...
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MDPI AG
2021-12-01
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| author | Olga Yu. Kurapova Pedro M. Faia Artem A. Zaripov Vasily V. Pazheltsev Artem A. Glukharev Vladimir G. Konakov |
| author_facet | Olga Yu. Kurapova Pedro M. Faia Artem A. Zaripov Vasily V. Pazheltsev Artem A. Glukharev Vladimir G. Konakov |
| author_sort | Olga Yu. Kurapova |
| collection | DOAJ |
| description | 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 Sb<sub>2</sub>O<sub>5</sub>·3H<sub>2</sub>O 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<sup>−2</sup> 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. |
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| last_indexed | 2024-03-10T04:37:52Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj.art-a375d76cd6834b00aa319eeb74bef7c52023-11-23T03:39:45ZengMDPI AGApplied Sciences2076-34172021-12-0111241187710.3390/app112411877Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel CellsOlga Yu. Kurapova0Pedro M. Faia1Artem A. Zaripov2Vasily V. Pazheltsev3Artem A. Glukharev4Vladimir G. Konakov5Institute of Chemistry, Department of Physical Chemistry, Saint Petersburg State University, Universitetskya Nab. 7/9, 199034 St. Petersburg, RussiaCenter 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, PortugalInstitute of Chemistry, Department of Physical Chemistry, Saint Petersburg State University, Universitetskya Nab. 7/9, 199034 St. Petersburg, RussiaInstitute of Chemistry, Department of Physical Chemistry, Saint Petersburg State University, Universitetskya Nab. 7/9, 199034 St. Petersburg, RussiaInstitute of Chemistry, Department of Physical Chemistry, Saint Petersburg State University, Universitetskya Nab. 7/9, 199034 St. Petersburg, RussiaInstitute of Chemistry, Peter the Great Saint Petersburg Polytechnic University, 29 Polytechnicheskaya Str., 195251 St. Petersburg, RussiaThe 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 Sb<sub>2</sub>O<sub>5</sub>·3H<sub>2</sub>O 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<sup>−2</sup> 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.https://www.mdpi.com/2076-3417/11/24/11877proton conductivitypolyantimonic acidion-conducting membranesimpedance spectroscopy |
| spellingShingle | Olga Yu. Kurapova Pedro M. Faia Artem A. Zaripov Vasily V. Pazheltsev Artem A. Glukharev Vladimir G. Konakov Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells Applied Sciences proton conductivity polyantimonic acid ion-conducting membranes impedance spectroscopy |
| title | Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells |
| title_full | Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells |
| title_fullStr | Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells |
| title_full_unstemmed | Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells |
| title_short | Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells |
| title_sort | electrochemical characterization of novel polyantimonic acid based proton conductors for low and intermediate temperature fuel cells |
| topic | proton conductivity polyantimonic acid ion-conducting membranes impedance spectroscopy |
| url | https://www.mdpi.com/2076-3417/11/24/11877 |
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