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Stability of Superprotonic CsH(2)PO(4) Hermetically Sealed in Different Environments

Using powder X-ray diffraction and AC impedance spectroscopy, we have found that the superprotonic CsH(2)PO(4) (CDP) phase is stable at T = 250 °C when sealed in different volumes (15 mL and 50 mL) of dry air or inert gasses. Under these conditions, CDP’s proton conductivity stays constant at 2.5 ×...

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Detalles Bibliográficos
Autores principales: Botez, Cristian E., Martinez, Israel, Price, Alex D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9320119/
https://www.ncbi.nlm.nih.gov/pubmed/35888435
http://dx.doi.org/10.3390/ma15144969
Descripción
Sumario:Using powder X-ray diffraction and AC impedance spectroscopy, we have found that the superprotonic CsH(2)PO(4) (CDP) phase is stable at T = 250 °C when sealed in different volumes (15 mL and 50 mL) of dry air or inert gasses. Under these conditions, CDP’s proton conductivity stays constant at 2.5 × 10(−2) S·cm(−)(1) for at least 10 h. On the other hand, removing the gas from the chamber leads to a sharp, two-order-of-magnitude drop in the proton conductivity. Our data show no evidence of a self-generated water vapor atmosphere in the chamber, and the gas pressure at T = 250 °C is several orders of magnitude below the pressures previously used to stabilize CDP’s superprotonic phase. These results demonstrate that hermetically sealing CDP in small gas-filled volumes represents a new method to stabilize the superprotonic phase, which opens new paths for large-scale applications of phosphate-based solid acids as fuel cell electrolytes.