EIS studies on electro-electrodialysis cell for concentration of hydriodic acid
EIS studies on electro-electrodialysis cell for concentration of hydriodic acid
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DOI：
10.1016/j.ijhydene.2010.06.031
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发表时间：
2010-09
影响因子：
7.2
通讯作者：
P. Sow;S. Sant;A. Shukla
中科院分区：
文献类型：
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作者：
P. Sow;S. Sant;A. Shukla
EIS 研究是在用于浓缩氢碘酸的电电渗析池上进行的，使用铂电极和 nafion117 膜。当碘浓度变化而 HI 浓度固定在 55 wt% 时，获得了不同的阻抗谱。使用等效电路模型来模拟实验数据，发现没有膜的电池的阻抗可以使用单个Warburg元件和串联的欧姆电阻来建模。这表明电极处仅存在扩散传输阻力并且不存在任何非电中性层。带膜的电池的阻抗谱可以使用 Warburg 元件和具有电容特性以及串联欧姆电阻的 CPE 进行建模。这表明除了扩散传输层之外，在膜上还形成了非电中性（异质传输）层。研究发现，欧姆电阻随着碘浓度的增加而增加，而Warburg和异质传输层引起的阻抗则随着碘浓度的增加而减少。
EIS studies were carried out on an electro-electrodialytic cell used for concentration of hydriodic acid using platinum electrodes and nafion117 membrane. Different impedance spectra were obtained where the concentration of iodine was varied while the concentration of HI was kept fixed at 55 wt%. Equivalent circuit model was used to simulate the experimental data and it was found that the impedance of the cell without membrane can be modeled using a single Warburg element along with ohmic resistance in series. This indicates presence of only diffusion transport resistance at the electrode and absence of any non-electroneutral layer. The impedance spectra for cell with membrane can be modeled using a Warburg element and a CPE with capacitive character along with ohmic resistance in series. This indicates formation of a non-electroneutral (heterogeneous transport) layer at the membrane in addition to a diffusion transport layer. It was found that the ohmic resistance increased with increase in the concentration of iodine while the impedances due Warburg and heterogeneous transport layer decreased with increase in iodine concentration.