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首页> 外文期刊>Inorganic materials >Electrical Conductivity and Structural Properties of Proton Electrolytes Based on CsH_2PO_4 and Silicophosphate Matrices with Low Phosphorus Content
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Electrical Conductivity and Structural Properties of Proton Electrolytes Based on CsH_2PO_4 and Silicophosphate Matrices with Low Phosphorus Content

机译：基于CsH_2PO_4和低磷硅磷酸盐基质的质子电解质的电导率和结构性质

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摘要

We have demonstrated that silicophosphate matrices with various P_2O_5 contents can be used to produce medium-temperature highly conductive CsH_2PO_4-based composites. The low-temperature conductivity of all the composites studied is higher than that of the salt at low humidity by up to three and half to four orders of magnitude. The phase transition disappears with increasing additive content. The proton conductivity, thermal characteristics, and phase composition of the salt are shown to depend significantly not only on the composition of the composite but also on that of the silicophosphate matrix. The composites with Si: P = 1 : 0.14 contain disordered CsH_2PO_4 in the range x = 0.1-0.6. Increasing the percentage of the heterogeneous component leads to CsH_2PO_4 amorphization at x = 0.7 and the formation of the CsH_5(PO_4)_2 compound at x = 0.8-0.9. The thermodynamic properties and thermal stability of the composites vary in accordance with this. We have assessed the thermal stability of the electrolytes of various compositions under isothermal conditions at 200-210℃ and water vapor content of ≃ 0.6- 1 % in air in prolonged tests. The thermal stability of the materials is shown to depend significantly on both the percentage of the salt in the composite and the composition of the matrix. We have determined the optimal thermal and transport characteristics of the composites based on silicophosphate gel with lower phosphorus content. This opens up the possibility of using them as membranes in medium-temperature hydrogen fuel cells.
机译：我们已经证明，具有各种P_2O_5含量的硅磷酸盐基质可用于生产中温高导电CsH_2PO_4基复合材料。在低湿度下，所有研究的复合材料的低温电导率都比盐的低温电导率高三到一半到四个数量级。随着添加剂含量的增加，相变消失。盐的质子传导率，热特性和相组成显示出不仅明显取决于复合材料的组成，而且还取决于硅磷酸盐基质的组成。 Si：P ＝ 1：0.14的复合物包含在x ＝ 0.1-0.6范围内的无序的CsH_2PO_4。增加异质组分的百分比导致在x = 0.7时CsH_2PO_4非晶化，并在x = 0.8-0.9时形成CsH_5（PO_4）_2化合物。复合材料的热力学性质和热稳定性据此而变化。在长时间的测试中，我们评估了各种成分的电解质在200-210℃的恒温条件下以及空气中水蒸气含量为≃0.6-1％时的热稳定性。已显示材料的热稳定性显着取决于复合物中盐的百分比和基质的组成。我们已经确定了基于磷含量较低的硅磷酸盐凝胶的复合材料的最佳热学和输运特性。这开辟了将它们用作中温氢燃料电池膜的可能性。

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  • 来源
    《Inorganic materials》 |2014年第10期|1056-1062|共7页
  • 作者

    V. G. Ponomareva; E. S. Shutova;

  • 作者单位

    Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128 Russia,Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia;

    Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128 Russia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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