Revisiting the natural convection effects at ultra-low redox concentration solutions: The influence of viscosity and diameter of wire electrode

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications Pub Date : 2024-09-11 DOI:10.1016/j.elecom.2024.107808

Zichen Zhang , Jianbang Ge , Biwu Cai , Yang Gao , Zhihao Cheng , Shun Cao , Shuqiang Jiao

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Abstract

Natural convection could arise even at ultra-low redox concentration solutions (1–10 mM). Models such as convection–diffusion layer model and spontaneous convection model have been established to describe this phenomenon. However, the driving forces as well as the parameters that influence this natural convection effects are still not clear. Herein we investigated the effects of viscosity on natural convection by introducing sodium alginate (SA), which enhanced viscosity without changing the diffusion coefficient of the redox couple. Resultantly, it allowed us to obtain the relationship between microscopic flow of solutions and the thickness of natural convection layer. Moreover, wire electrodes with various diameters were also tested to reveal the natural convection effects on mass transfer. An empirical equation was established to describing the influences of solution viscosity and diameter of wire electrode on the thickness of natural convection layer in ultra-low redox concentration solutions.

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重新审视超低氧化还原浓度溶液的自然对流效应：粘度和线电极直径的影响

即使在超低氧化还原浓度溶液（1-10 毫摩尔）中也会产生自然对流。目前已经建立了对流-扩散层模型和自发对流模型来描述这种现象。然而，影响这种自然对流效应的驱动力和参数仍不清楚。在此，我们通过引入海藻酸钠（SA）研究了粘度对自然对流的影响，海藻酸钠在不改变氧化还原偶的扩散系数的情况下增强了粘度。结果，我们获得了溶液的微观流动与自然对流层厚度之间的关系。此外，我们还测试了不同直径的金属丝电极，以揭示自然对流对传质的影响。建立了一个经验方程来描述溶液粘度和金属丝电极直径对超低氧化还原浓度溶液中自然对流层厚度的影响。

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来源期刊

Electrochemistry Communications 工程技术-电化学

CiteScore

8.50

自引率

3.70%

发文量

160

审稿时长

1.2 months

期刊介绍： Electrochemistry Communications is an open access journal providing fast dissemination of short communications, full communications and mini reviews covering the whole field of electrochemistry which merit urgent publication. Short communications are limited to a maximum of 20,000 characters (including spaces) while full communications and mini reviews are limited to 25,000 characters (including spaces). Supplementary information is permitted for full communications and mini reviews but not for short communications. We aim to be the fastest journal in electrochemistry for these types of papers.