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Intermediate temperature stable proton conductors based upon SnP2O7, including additional H3PO4

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Author(s)

Xiaoxiang Xu, Shanwen Tao, Philip Wormald, John Thomas Sirr Irvine

School/Research organisations

Abstract

In order to examine the influence of phosphate impurities upon the conduction properties of SnP2O7, SnP2O7-H3PO4 composites were synthesised through different methods with varying starting P:Sn molar ratios. The composites were then carefully characterised by XRD, SEM, HRTEM, NMR, FT-IR and a.c. impedance spectroscopy to explore the phase compositions and electrical properties. It was found that cubic SnP2O7 is the main crystalline phase and amorphous phases were observed when starting P:Sn ratios exceeded 2:1. Solid State 31P NMR confirmed residual phosphoric acid in samples with high starting P:Sn ratios whilst impedance spectroscopy indicated these to be good proton conductors. The highest conductivity observed was 3.5 × 10−2 S/cm at 300 °C in air for samples with high starting P:Sn ratios and calcined at higher temperatures. The conductivity stability of the composites was found to be promising, suggesting a new approach for the development of technically useful proton conductors
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Original languageEnglish
Pages (from-to)7827
Number of pages7833
JournalJournal of Materials Chemistry
Volume20
Issue number36
DOIs
Publication statusPublished - 28 Aug 2010

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