熔盐
电解质
电化学
盐(化学)
氧化还原
化学
无机化学
钨
扩散
分析化学(期刊)
电极
热力学
物理化学
色谱法
有机化学
物理
作者
Stephen J. Percival,Rose A. Lee,Martha M. Gross,Amanda Peretti,Leo J. Small,Erik David Spoerke
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-03-01
卷期号:168 (3): 036510-036510
被引量:3
标识
DOI:10.1149/1945-7111/abebae
摘要
NaI-AlBr 3 is a very appealing low melting temperature (<100 °C), salt system for use as an electrochemically-active electrolyte. This system was investigated for its electrochemical and physical properties with focus to energy storage considerations. A simple phase diagram was generated; at >100 °C, lower NaI concentrations had two partially miscible liquid phases, while higher NaI concentrations had solid particles. Considering the fully molten regime, electrical conductivities were evaluated over 5–25 mol% NaI and 110 °C–140 °C. Conductivities of 6.8–38.9 mS cm −1 were observed, increasing with temperature and NaI concentration. Effective diffusion coefficients of the I − /I 3 − redox species were found to decrease with both increasing NaI concentration and increasing applied potential. Regardless, oxidation current density at 3.6 V vs Na/Na + was observed to increase with increasing NaI concentration over 5–25 mol%. Finally, the critical interface between the molten salt electrolyte and electrode materials was found to significantly affect reaction kinetics. When carbon was used instead of tungsten, an adsorbed species, most likely I 2 , blocked surface sites and significantly decreased current densities at high potentials. This study shows the NaI-AlBr 3 system offers an attractive, low-temperature molten salt electrolyte that could be useful to many applied systems, though composition and electrode material must be considered.
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