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首页> 外文期刊>Microelectronic Engineering >Dynamic behaviour of a diffusion layer around a cation-exchange membrane in an external electric field
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Dynamic behaviour of a diffusion layer around a cation-exchange membrane in an external electric field

机译：外部电场中阳离子交换膜周围扩散层的动态行为

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摘要

In this study we present an experimental device for studying the dynamic behaviour of spatial potential profiles around a cation-exchange membrane (CEM). We have designed and constructed a microdevice with integrated CEM. An array of golden microelectrodes is integrated around the membrane. The experimental arrangement used is capable of capturing the measured signal in sub-millisecond time intervals. We have studied the behaviour of the system using a galvanostatic mode in the area of the over-limiting current. The influence of two parameters is presented: (i) the effect of hydrodynamic mixing, and (ii) the effect of current density. Our results show that with increasing electrolyte flow both the total potential drop over the membrane and the width of the diffusion boundary layer decrease. With higher current densities the overall potential drop increases and also the potential profile changes are faster. The changes of potential profiles are related to changes in the concentration distribution of ionic species around the membrane. This type of experiments can also be used for verifying the local changes of electrolyte concentration during the process, for estimating the thickness of diffusion boundary layer and for validating the predictions of mathematical models that describe the dynamic behaviour of the system around the membrane.
机译：在这项研究中，我们提出了一个实验设备，用于研究阳离子交换膜（CEM）周围空间电位分布的动态行为。我们设计并构建了具有集成CEM的微型设备。一系列金黄色微电极被整合在膜周围。所使用的实验装置能够在不到毫秒的时间间隔内捕获测量信号。我们已经研究了在超限电流区域中使用恒电流模式的系统行为。给出了两个参数的影响：（i）流体动力混合的影响，以及（ii）电流密度的影响。我们的结果表明，随着电解质流量的增加，膜上的总电势下降和扩散边界层的宽度均减小。随着电流密度的增加，总的电位降增加，并且电位分布的变化也更快。电位分布的变化与膜周围离子种类的浓度分布变化有关。这种类型的实验还可以用于验证过程中电解质浓度的局部变化，估计扩散边界层的厚度以及验证描述围绕膜的系统动态行为的数学模型的预测。

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  • 来源
    《Microelectronic Engineering》 |2011年第8期|p.1789-1791|共3页
  • 作者

    MiloS Svoboda; Jin Kratochvila; Jiri Lindner; Michal Pribyl; Dalimil Snita;

  • 作者单位

    Dept of Chemical Engineering, Institute of Chemical Technology, Tedmickd 5, 16628 Prague 6, Czech Republic;

    Dept of Chemical Engineering, Institute of Chemical Technology, Tedmickd 5, 16628 Prague 6, Czech Republic;

    Dept of Chemical Engineering, Institute of Chemical Technology, Tedmickd 5, 16628 Prague 6, Czech Republic;

    Dept of Chemical Engineering, Institute of Chemical Technology, Tedmickd 5, 16628 Prague 6, Czech Republic;

    Dept of Chemical Engineering, Institute of Chemical Technology, Tedmickd 5, 16628 Prague 6, Czech Republic;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    electro-membrane processes; diffusion layer; ion-exchange membrane; limiting current;

    机译：电膜工艺扩散层离子交换膜极限电流;

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