| 电场增强条件下双极膜水解离的简化模型 |
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| 引用本文： | 徐铜文,杨伟华,何炳林. 电场增强条件下双极膜水解离的简化模型[J]. 中国化学工程学报, 2001, 9(2): 179-185 |
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| 作者姓名： | 徐铜文 杨伟华 何炳林 |
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| 作者单位： | [1]DepartmentofAppliedChemistry;Hefei230026,China [2]TheStateKeyLaboratoryofFunctionalPolymericMaterialsforAdsorptionandSeparation,NankaiUniversity,Tianjin300071,China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (No. 29976040), the Natural Science Foundation of Anhui Province (No. 99045431) and Youth Foundation of USTC. |
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| 摘 要： | This work is concentrated on elucidating the mechanism of the electric field enhanced water dissociation.A simple model was established for the theoretical current-voltage characteristics in water dissociation process on a bipolar membrane based on the existence of a depletion layer and Onsager‘s theory. Particular attention was given to the influence of applied voltage on depletion thickness and the dissociation constant. The factors on the water splitting process, such as water ditfusivity, water content, ion exchange capacity, temperature, relative permittivity,etc. were adequately analysed based on the derived model equations and several suggestions were proposed for decreasing the applied voltage in practical operation. The water dissociation tests were conducted and compared with both the theoretical calculation and the measured current-voltage curves reported in the literature, which showed a very good prediction to practical current-voltage behavior of a bipolar membrane at high current densities when the splitting of water actually commenced.
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| 关 键 词： | 电场增强 双极膜 水解离 模型 电流电压表征 |
| 修稿时间： | |
A Simple Model to Determine the Trends of Electric Field Enhanced Water Dissociation in a Bipolar Membrane |
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| XU Tongwen,Yang Weihua,HE Binglin. A Simple Model to Determine the Trends of Electric Field Enhanced Water Dissociation in a Bipolar Membrane[J]. Chinese Journal of Chemical Engineering, 2001, 9(2): 179-185 |
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| Authors: | XU Tongwen Yang Weihua HE Binglin |
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| Affiliation: | Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China Research Center for Resources and Environments, University of Science and Technology of China, Hefei 230026, China The State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation, Nankai University. Tianjin 300071, China |
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| Abstract: | This work is concentrated on elucidating the mechanism of the electric field enhanced water dissociation. A simple model was established for the theoretical current-voltage characteristics in water dissociation process on a bipolar membrane based on the existence of a depletion layer and Onsager's theory. Particular attention was given to the influence of applied voltage on depletion thickness and the dissociation constant. The factors on the water splitting process, such as water diffusivity, water content, ion exchange capacity, temperature, relative permittivity, etc. were adequately analysed based on the derived model equations and several suggestions were proposed for decreasing the applied voltage in practical operation. The water dissociation tests were conducted and compared with both the theoretical calculation and the measured current-voltage curves reported in the literature, which showed a very good prediction to practical current-voltage behavior of a bipolar membrane at high current densities when the splitting of water actually commenced. |
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| Keywords: | bipolar membrane electric field water dissociation current-voltage characteristics |
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