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Membranes 2019, 9(4), 49; https://doi.org/10.3390/membranes9040049

Protonic Conduction of Partially-Substituted CsH2PO4 and the Applicability in Electrochemical Devices

1
Instituto de Tecnología Química, Universitat Politècnica de València—Consejo Superior de Investigaciones Científicas, Av. Naranjos s/n, E-46022 Valencia, Spain
2
Departamento de Física, Universitat Jaume, I.12080-Castellón, Spain
3
Departamento de Termodinámica Aplicada, Universidad Politécnica de Valencia, C/Camino de Vera s/n, 46022-Valencia, Spain
*
Author to whom correspondence should be addressed.
Received: 30 January 2019 / Revised: 25 March 2019 / Accepted: 2 April 2019 / Published: 9 April 2019
(This article belongs to the Special Issue Membranes for Fuel Cells)
PDF [1204 KB, uploaded 9 April 2019]

Abstract

CsH2PO4 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 CsH2PO4 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. CsH2PO4 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 CsH2PO4 as electrolyte, Cu and ZnO as cathode and Pt and Ag as anode was evaluated, obtaining a stable production of H2 at 250 °C.
Keywords: cesium dihydrogen phosphate; proton conductor; composite solid electrolyte; conductivity; fuel cell cesium dihydrogen phosphate; proton conductor; composite solid electrolyte; conductivity; fuel cell
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Navarrete, L.; Andrio, A.; Escolástico, S.; Moya, S.; Compañ, V.; Serra, J.M. Protonic Conduction of Partially-Substituted CsH2PO4 and the Applicability in Electrochemical Devices. Membranes 2019, 9, 49.

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