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Mixed electrolyte effect on the stability of the interface between two immiscible electrolyte solutions
Electrochimica Acta ( IF 5.5 ) Pub Date : 2021-10-17 , DOI: 10.1016/j.electacta.2021.139405
Antonín Trojánek 1 , Vladimír Mareček 1 , Zdeněk Samec 1
Affiliation  

Polarization and interfacial tension measurements at an electrolyte dropping electrode or a sessile electrolyte drop are used to investigate the instability of the interface between the aqueous solution of LiCl and the organic solvent containing a mixture of the electrolytes composed of the non-adsorbing ions, here tetrabutylammonium tetraphenylborate (TBATPB) and bis(triphenylphosphoranylidene) ammonium tetrakis (pentafluorophenyl)borate (BATB). The instability is manifested by a substantial current enhancement and decrease of the interfacial tension accompanied by the vigorous mechanical oscillations of the drop. In contrast, no instability is observed when the organic solvent phase contains TBATPB or BATB alone. It is proposed that the hydrodynamic instability has the origin in the small faradaic current associated with the trace ion transfer, and that the initiating impulse is generated by the perturbation of the stratified distribution of the ions with the significantly different sizes (e.g., TBA+ and BA+) on the organic side of the interface. Effects of the potential and the electrolyte concentration on the current enhancement and the interfacial tension reduction are explained by the kinematic theory that has been established by Aogaki et al. (Electrochim. Acta 23 (1978) 867).



中文翻译:

混合电解质对两种不混溶电解质溶液界面稳定性的影响

在电解液滴电极或固定电解液滴上的极化和界面张力测量用于研究 LiCl 水溶液和含有由非吸附离子组成的电解质混合物的有机溶剂之间界面的不稳定性,这里是四丁基铵四苯基硼酸盐 (TBATPB) 和双 (三苯基亚膦基) 四 (五氟苯基) 硼酸铵 (BATB)。不稳定性表现为电流的显着增强和界面张力的降低,同时伴随着液滴的剧烈机械振荡。相反,当有机溶剂相仅包含 TBATPB 或 BATB 时,没有观察到不稳定性。提出流体动力学不稳定性起源于与痕量离子转移相关的小法拉第电流,+和 BA + ) 在界面的有机侧。Aogaki 等人建立的运动学理论解释了电位和电解质浓度对电流增强和界面张力降低的影响。(Electrochim. Acta 23 (1978) 867)。

更新日期:2021-10-24
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