Giant Haven ratio for proton transport in sodium hydroxide
Giant Haven ratio for proton transport in sodium hydroxide
复制标题
氢氧化钠中质子传输的巨港比
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
C. Cramer
中科院分区：
文献类型：
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作者：
M. Spaeth;K. Kreuer;J. Maier;C. Cramer
制备了固体氢氧化钠，并对其输运性质进行了研究。质子电导率在很大程度上取决于水的含量。在水含量最低的NaOH(与Na2O处于相平衡状态)中，质子电导率比文献报道的要低得多。讨论了缺陷化学和输运特性。对于相同的干燥样品，脉冲梯度场核磁共振显示出惊人的高氢扩散系数，因此立方相的Haven比为10-104。事实上，这个值只是下限，因为测量的电导率仍然可能受到残余外在效应或由于Na+贡献的影响。描述了一种能够解释这种反常现象的合作机制。
Abstract Solid sodium hydroxide has been prepared and investigated with respect to its transport properties. The proton conductivity depends significantly on the water content. In NaOH with minimum water content (NaOH in phase equilibrium with Na 2 O) the proton conductivity is much lower than reported in the literature. Defect chemistry and transport characteristics are discussed. For the same dry samples pulsed field gradient NMR revealed a surprisingly high H-diffusion coefficient and thus a Haven ratio of 10–10 4 in the cubic phase. In fact this value is only the lower limit since the measured conductivity may still be influenced by residual extrinsic effects or due to Na + contributions. A cooperative mechanism is described which is able to explain this anomaly.