Protonic Conduction of Partially-Substituted CsH<sub>2</sub>PO<sub>4</sub> and the Applicability in Electrochemical Devices
CsH<sub>2</sub>PO<sub>4</sub> is a proton conductor pertaining to the acid salts group and shows a phase transition from monoclinic to cubic phase at 232 ± 2 °C under high-steam atmospheres (>30%). This cubic phase gives rise to the so-called superpro...
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| Format: | Article |
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MDPI AG
2019-04-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/9/4/49 |
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| author | Laura Navarrete Andreu Andrio Sonia Escolástico Sergio Moya Vicente Compañ José M. Serra |
| author_facet | Laura Navarrete Andreu Andrio Sonia Escolástico Sergio Moya Vicente Compañ José M. Serra |
| author_sort | Laura Navarrete |
| collection | DOAJ |
| description | CsH<sub>2</sub>PO<sub>4</sub> is a proton conductor pertaining to the acid salts group and shows a phase transition from monoclinic to cubic phase at 232 ± 2 °C under high-steam atmospheres (>30%). This cubic phase gives rise to the so-called superprotonic conductivity. In this work, the influence of the partial substitution of Cs by Ba and Rb, as well as the partial substitution of P by W, Mo, and S in CsH<sub>2</sub>PO<sub>4</sub> on the phase transition temperature and electrochemical properties is studied. Among the tested materials, the partial substitution by Rb led to the highest conductivity at high temperature. Furthermore, Ba and S-substituted salts exhibited the highest conductivity at low temperatures. CsH<sub>2</sub>PO<sub>4</sub> was used as electrolyte in a fully-assembled fuel cell demonstrating the applicability of the material at high pressures and the possibility to use other materials (Cu and ZnO) instead of Pt as electrode electrocatalyst. Finally, an electrolyzer cell composed of CsH<sub>2</sub>PO<sub>4</sub> as electrolyte, Cu and ZnO as cathode and Pt and Ag as anode was evaluated, obtaining a stable production of H<sub>2</sub> at 250 °C. |
| first_indexed | 2024-03-12T06:19:31Z |
| format | Article |
| id | doaj.art-2fe5b96946d948bd9f08475b2cf5e451 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-12T06:19:31Z |
| publishDate | 2019-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-2fe5b96946d948bd9f08475b2cf5e4512023-09-03T02:19:16ZengMDPI AGMembranes2077-03752019-04-01944910.3390/membranes9040049membranes9040049Protonic Conduction of Partially-Substituted CsH<sub>2</sub>PO<sub>4</sub> and the Applicability in Electrochemical DevicesLaura Navarrete0Andreu Andrio1Sonia Escolástico2Sergio Moya3Vicente Compañ4José M. Serra5Instituto de Tecnología Química, Universitat Politècnica de València—Consejo Superior de Investigaciones Científicas, Av. Naranjos s/n, 46022 Valencia, SpainDepartamento de Física, Universitat Jaume, I., 12080 Castellón, SpainInstituto de Tecnología Química, Universitat Politècnica de València—Consejo Superior de Investigaciones Científicas, Av. Naranjos s/n, 46022 Valencia, SpainDepartamento de Termodinámica Aplicada, Universidad Politécnica de Valencia, C/Camino de Vera s/n, 46022 Valencia, SpainDepartamento de Termodinámica Aplicada, Universidad Politécnica de Valencia, C/Camino de Vera s/n, 46022 Valencia, SpainInstituto de Tecnología Química, Universitat Politècnica de València—Consejo Superior de Investigaciones Científicas, Av. Naranjos s/n, 46022 Valencia, SpainCsH<sub>2</sub>PO<sub>4</sub> is a proton conductor pertaining to the acid salts group and shows a phase transition from monoclinic to cubic phase at 232 ± 2 °C under high-steam atmospheres (>30%). This cubic phase gives rise to the so-called superprotonic conductivity. In this work, the influence of the partial substitution of Cs by Ba and Rb, as well as the partial substitution of P by W, Mo, and S in CsH<sub>2</sub>PO<sub>4</sub> on the phase transition temperature and electrochemical properties is studied. Among the tested materials, the partial substitution by Rb led to the highest conductivity at high temperature. Furthermore, Ba and S-substituted salts exhibited the highest conductivity at low temperatures. CsH<sub>2</sub>PO<sub>4</sub> was used as electrolyte in a fully-assembled fuel cell demonstrating the applicability of the material at high pressures and the possibility to use other materials (Cu and ZnO) instead of Pt as electrode electrocatalyst. Finally, an electrolyzer cell composed of CsH<sub>2</sub>PO<sub>4</sub> as electrolyte, Cu and ZnO as cathode and Pt and Ag as anode was evaluated, obtaining a stable production of H<sub>2</sub> at 250 °C.https://www.mdpi.com/2077-0375/9/4/49cesium dihydrogen phosphateproton conductorcomposite solid electrolyteconductivityfuel cell |
| spellingShingle | Laura Navarrete Andreu Andrio Sonia Escolástico Sergio Moya Vicente Compañ José M. Serra Protonic Conduction of Partially-Substituted CsH<sub>2</sub>PO<sub>4</sub> and the Applicability in Electrochemical Devices Membranes cesium dihydrogen phosphate proton conductor composite solid electrolyte conductivity fuel cell |
| title | Protonic Conduction of Partially-Substituted CsH<sub>2</sub>PO<sub>4</sub> and the Applicability in Electrochemical Devices |
| title_full | Protonic Conduction of Partially-Substituted CsH<sub>2</sub>PO<sub>4</sub> and the Applicability in Electrochemical Devices |
| title_fullStr | Protonic Conduction of Partially-Substituted CsH<sub>2</sub>PO<sub>4</sub> and the Applicability in Electrochemical Devices |
| title_full_unstemmed | Protonic Conduction of Partially-Substituted CsH<sub>2</sub>PO<sub>4</sub> and the Applicability in Electrochemical Devices |
| title_short | Protonic Conduction of Partially-Substituted CsH<sub>2</sub>PO<sub>4</sub> and the Applicability in Electrochemical Devices |
| title_sort | protonic conduction of partially substituted csh sub 2 sub po sub 4 sub and the applicability in electrochemical devices |
| topic | cesium dihydrogen phosphate proton conductor composite solid electrolyte conductivity fuel cell |
| url | https://www.mdpi.com/2077-0375/9/4/49 |
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