Stability of Superprotonic CsH2PO4 Hermetically Sealed in Different Environments
| dc.contributor.author | Botez, Cristian E. | |
| dc.contributor.author | Martinez, Israel | |
| dc.contributor.author | Price, Alex D. | |
| dc.date.accessioned | 2022-07-25T16:32:55Z | |
| dc.date.available | 2022-07-25T16:32:55Z | |
| dc.date.issued | 2022-07-17 | |
| dc.date.updated | 2022-07-25T16:32:56Z | |
| dc.description.abstract | Using powder X-ray diffraction and AC impedance spectroscopy, we have found that the superprotonic CsH2PO4 (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. | |
| dc.description.department | Physics and Astronomy | |
| dc.identifier | doi: 10.3390/ma15144969 | |
| dc.identifier.citation | Materials 15 (14): 4969 (2022) | |
| dc.identifier.uri | https://hdl.handle.net/20.500.12588/1069 | |
| dc.rights | Attribution 4.0 United States | |
| dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
| dc.subject | fuel cell electrolytes | |
| dc.subject | proton conductivity | |
| dc.subject | impedance spectroscopy | |
| dc.title | Stability of Superprotonic CsH2PO4 Hermetically Sealed in Different Environments | |
| dc.type | Article |