Impedance spectroscopic determination of effect of temperature on the transport resistances of an electro-electrodialysis cell used for concentration of hydriodic acid
Impedance spectroscopic determination of effect of temperature on the transport resistances of an electro-electrodialysis cell used for concentration of hydriodic acid
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DOI：
10.1007/s10800-012-0500-7
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发表时间：
2012
影响因子：
2.9
通讯作者：
P. Sow;D. Parvatalu;A. Bhardwaj;B. N. Prabhu;A. Bhaskarwar;A. Shukla
中科院分区：
文献类型：
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作者：
P. Sow;D. Parvatalu;A. Bhardwaj;B. N. Prabhu;A. Bhaskarwar;A. Shukla
通过对电渗析电池阻抗响应的等效电路建模，发现温度对用于浓缩氢酸的电渗析电池不同传输电阻的影响。EED电池由Nafion 117膜隔开的两个隔室组成，每个隔室有一个铂电极。两个隔室都填充了55wt%HI含0.5M碘的水溶液。在308-353K的四个不同温度范围内进行了阻抗测量。电池的等效电路由电池欧姆电阻的电阻、扩散边界层的电阻的Warburg元件和膜上非电中性的非电中性非均相传输层的离子传输阻力的恒相元件组成。温度对非均相输运阻抗的影响小于Warburg阻抗以及溶液和膜电阻。异质传输层的有效电容随温度的升高而减小。研究发现，随着电池工作温度的升高，非均相传输层和扩散边界层的动力学特性降低。
Effect of temperature on different transport resistances of an electro-electrodialysis (EED) cell used for concentration of hydriodic acid (HI) was found by equivalent circuit modeling of the measured impedance response of the cell. The EED cell consisted of two compartments separated by Nafion 117 membrane and each compartment had a platinum electrode. Both the compartments were filled with aqueous solution of 55 wt% HI containing 0.5 M iodine. Impedance measurements were carried out at four different temperatures in the range of 308–353 K. Equivalent circuit for the cell consisted of a resistor for ohmic resistance of the cell, a Warburg element for the resistance due to diffusion boundary layer and a constant phase element for the resistance to transport of ions due to non-electro neutral heterogeneous transport layer at the membrane. Effect of temperature on impedance due to heterogeneous transport was lower than the Warburg impedance and the solution and membrane resistance. Effective capacitance of the heterogeneous transport layer was found to reduce with temperature. The dynamics of the heterogeneous transport layer along with the diffusional boundary layer were found to reduce with increase in the cell operating temperature.