Proton Conductivity of Cs2MnH3(P2O7)2and Rb2MnHP2O7(H2PO4)2

Chudinova, N. N.; Мурашова, Е. В.; Zakharova, B. S.; Tarnopol'skii, V. A.; Yaroslavtsev, A. B.

doi:10.1023/b:inma.0000020528.41745.47

Cited by 1 publication

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“…[7][8][9] For the latter case, significant amounts of time have been devoted to the investigation and modifications of oxo acid salts such as CsHSO 4 or CsH 2 PO 4 . [10][11][12][13][14][15][16][17] Although the acid salts could exhibit a high conductivity ($10 À2 S/cm) above 150 C, thermal decomposition of SO 4 2À ions in a reducing atmosphere may limit the application of sulfate based solid acid salts as electrolytes in fuel cells. 18 CsH 2 PO 4 has been shown to be a good electrolyte material for intermediate temperature fuel cells.…”

Section: Introductionmentioning

confidence: 99%

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

Tao²,

Wormald

et al. 2010

J. Mater. Chem.

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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 31 P 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 x 10(-2) S/cm at 300 degrees 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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