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Proton-conducting phosphate glass and its melt exhibiting high electrical conductivity at intermediate temperatures

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Abstract

A working hypothesis to design proton-conducting phosphate glasses exhibiting high proton conductivity and high stability was proposed. In this hypothesis, the precursor glass before electrochemical alkali-proton substitution (APS) is required to fulfill the terms of (i) the concentration of NaO1/2 in the precursor glass needs to be higher than 35 mol%, (ii) the O/P ratio of the glass composition cannot exceed 3.5, (iii) the glass network modifier oxides need to consist of cations with low electronegativity, (iv) the glass must contain a sufficient amount of glass network modifiers and intermediate oxides, such as alkaline-earth oxides, Al2O3, Y2O3, La2O3, WO3, Nb2O5, and Ta2O5, (v) the glass needs to consist of more than four or five components, and (vi) the glass must contain a small amount of GeO2 and/or B2O3. Based on the proposed working hypothesis, we obtained a 36HO1/2–4NbO5/2–2BaO–4LaO3/2–4GeO2–1BO3/2–49PO5/2 glass (36H-glass) by APS. While the glass transition temperature of 36H-glass was 179 °C, the glass, accurately the super cooled liquid, was stable for a long time up to 280 °C under fuel cell operating conditions and exhibited 1 × 10−3 S cm−1 at 280 °C, indicating that the developed working hypothesis is useful to design new proton-conducting electrolytes that work at intermediate temperatures.

Graphical abstract: Proton-conducting phosphate glass and its melt exhibiting high electrical conductivity at intermediate temperatures

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Publication details

The article was received on 22 Aug 2018, accepted on 04 Nov 2018 and first published on 06 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA08162J
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Proton-conducting phosphate glass and its melt exhibiting high electrical conductivity at intermediate temperatures

    T. Yamaguchi, S. Tsukuda, T. Ishiyama, J. Nishii, T. Yamashita, H. Kawazoe and T. Omata, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA08162J

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