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Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells
| Content Provider | MDPI |
|---|---|
| Author | Kurapova, Olga Yu. Faia, Pedro M. Zaripov, Artem A. Pazheltsev, Vasily V. Glukharev, Artem A. Konakov, Vladimir G. |
| Copyright Year | 2021 |
| 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 $Sb_{2}O_{5}·3H_{2}$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 × $10^{−2}$ 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. |
| Starting Page | 11877 |
| e-ISSN | 20763417 |
| DOI | 10.3390/app112411877 |
| Journal | Applied Sciences |
| Issue Number | 24 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-12-14 |
| Access Restriction | Open |
| Subject Keyword | Applied Sciences Proton Conductivity Polyantimonic Acid Ion-conducting Membranes Impedance Spectroscopy |
| Content Type | Text |
| Resource Type | Article |
