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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Proton conductivity in mixed cation phosphate, KMg1-xH2x(PO3)center dot yH(2)O, with a layered structure at low-intermediate temperatures
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Proton conductivity in mixed cation phosphate, KMg1-xH2x(PO3)center dot yH(2)O, with a layered structure at low-intermediate temperatures

机译：在混合阳离子磷酸盐中的质子电导率，KMG1-XH2X（PO3）中心点YH（2）O，在低中间温度下具有层状结构

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Proton solid electrolytes, which exhibit high proton conductivity at a wide range of low-intermediate temperatures (150-300 degrees C), are key materials for the development of fuel cells for automobiles and cogeneration systems. In this study, a benitoite-type polyphosphate, KMg1-xH2x(PO3)center dot yH(2)O, which has a non-combustible and layered structure, was investigated as a new proton conductor. The benitoite-type KMg1-xH2x(PO3)center dot yH(2)O was synthesised by a coprecipitation method. The solid solution formed in the range of x = 0-0.100 in KMg1-xH2x(PO3)(3)center dot yH(2)O. Multi-step weight loss due to dehydration was observed for TG/DTA measurement at 30 degrees C and 150 degrees C. We observed enhanced peaks of the vibration bands at around 1117 cm(-1) and 1229 cm(-1), which were attributed to the symmetric and asymmetric PO2 vibration modes, and at 743 cm(-1) and 970 cm(-1) due to the n(s)(P-O-P) and n(as)(P-O-P) modes as well as broad absorbance peaks at 2300 cm(-1) and 2700 cm(-1) corresponding to the vibration modes of n(s)(P-O-H) with increasing x for FTIR spectra, which suggest the introduction of protons to the crystal structure. Proton conductivity increased from x = 0 to 0.10 and then decreased at x = 0.125, where the impurity phase was observed. The sample with x = 0.10 in benitoite-type KMg1-xH2x(PO3)(3)center dot yH(2)O exhibited high proton conductivity of 1.4 x 10(-3) S cm(-1) at 150 degrees C and 6.5 x 10(-3) S cm(-1) at 250 degrees C under a non-humidified N-2 gas flow.
机译：质子固体电解质在中低温（150-300摄氏度）范围内表现出较高的质子导电性，是开发汽车燃料电池和热电联产系统的关键材料。在本研究中，研究了一种具有不可燃层状结构的贝尼特型聚磷酸盐KMg1-xH2x（PO3）中心点yH（2）O作为一种新型质子导体。采用共沉淀法合成了硼铁矿型KMg1-xH2x（PO3）中心点yH（2）O。在KMg1-xH2x（PO3）（3）中心点yH（2）O中，在x=0-0.100范围内形成固溶体。在30℃和150℃下进行TG/DTA测量时，观察到脱水导致的多步重量损失。我们在约1117 cm（-1）和1229 cm（-1）处观察到振动带的增强峰值，这归因于对称和非对称的PO2振动模式，由于n（s）（P-O-P）和n（as）（P-O-P）模式，以及2300 cm（-1）和2700 cm（-1）处的宽吸收峰对应于n（s）（P-O-H）的振动模式，随着FTIR光谱x的增加，在743 cm（-1）和970 cm（-1），这表明在晶体结构中引入了质子。质子电导率从x=0增加到0.10，然后在x=0.125时下降，此时观察到杂质相。在未增湿的N-2气流条件下，在150°C时，KMg1-xH2x（PO3）（3）中心点yH（2）O中x=0.10的样品在150°C时表现出1.4 x 10（-3）S cm（-1）的高质子电导率，在250°C时表现出6.5 x 10（-3）S cm（-1）的高质子电导率。

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