<br>铝在盐酸三乙胺-氯化铝离子液体中的电化学行为,Physical Chemistry Chemical Physics

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铝在盐酸三乙胺-氯化铝离子液体中的电化学行为
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2023-11-06 , DOI: 10.1039/d3cp03403h
Alexey V Borozdin ₁ , Peter Yu Shevelin ₁ , Vladimir A Elterman ₁ , Liudmila A Yolshina ₁

Affiliation

本文通过静态电解和电化学阻抗谱研究了铝在AlCl ₃ -Et ₃ NHCl（N）摩尔比为1.3~1.95的AlCl ₃ -Et ₃ NHCl中的电化学行为。获得阴极和阳极静态极化曲线。阴极极化曲线呈 S 形并包含极限电流平台部分。在阳极过电位下观察到盐钝化。首次测量了表观交换电流密度，发现随着Al ₂ Cl ₇ ^-浓度的增加，表观交换电流密度从1.02 mA cm -2 增加至2.50 mA cm ^-2 。计算了T = 303 K 时的表观电化学速率常数和传输系数（分别为1.14 × 10 ^-6 cm s ^-1和0.14）。在303和373 K（ N = 1.5）之间的温度下测定了Al|AlCl ₃ –Et ₃ NHCl界面的表观交换电流密度，并且使用该数据计算表观电化学速率常数（2.6 × 10 ^-6到 10 ^-6厘米·秒^-1 );还确定了电荷转移过程的活化能（31.4 kJ mol ^-1 ）。本文获得的结果可用于优化铝离子电池中电解质的成分，并进一步研究氯铝酸盐离子液体中发生的过程。

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Electrochemical behavior of aluminum in triethylamine hydrochloride–aluminum chloride ionic liquid

This paper studies the electrochemical behavior of aluminum in AlCl₃–Et₃NHCl with a molar ratio of AlCl₃ to Et₃NHCl (N) from 1.3 to 1.95 by stationary electrolysis and electrochemical impedance spectroscopy. Cathodic and anodic stationary polarization curves are obtained. The cathodic polarization curves are S-shaped and contain limiting current plateau sections. Salt passivation is observed at anodic overpotentials. Apparent exchange current densities were measured for the first time and were found to increase from 1.02 to 2.50 mA cm⁻² with an increase in Al₂Cl₇⁻ concentration. The apparent electrochemical rate constant and transfer coefficient at T = 303 K were calculated (1.14 × 10⁻⁶ cm s⁻¹ and 0.14, respectively). Apparent exchange current densities at the Al|AlCl₃–Et₃NHCl interface are determined at temperatures between 303 and 373 K (N = 1.5), and the data are used to calculate the apparent electrochemical rate constant (2.6 × 10⁻⁶ to 10⁻⁶ cm s⁻¹); the activation energy for the charge transfer process was also determined (31.4 kJ mol⁻¹). The results obtained in this paper may be used to optimize the composition of electrolytes in aluminum-ion batteries and also to further investigate the processes taking place in chloroaluminate ILs.

更新日期：2023-11-06

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