CIESC Journal

• RESEARCH PAPERS • 上一篇    下一篇

电场增强条件下双极膜水解离的简化模型

徐铜文a,b; 杨伟华a; 何炳林c   

  1. a Department of Applied Chemistry, University of Science and Technology of China, Hefei
    230026, China
    b Research Center for Resources and Environments, University of Science and Technology of
    China, Hefei 230026, China
    c The State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation,
    Nankai University. Tianjin 300071, China
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2001-06-28 发布日期:2001-06-28
  • 通讯作者: 徐铜文

A Simple Model to Determine the Trends of Electric Field Enhanced Water Dissociation in a
Bipolar Membrane

XU Tongwena,b; YANG Weihuaa; HE Binglinc   

  1. a Department of Applied Chemistry, University of Science and Technology of China, Hefei
    230026, China
    b Research Center for Resources and Environments, University of Science and Technology of
    China, Hefei 230026, China
    c The State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation,
    Nankai University. Tianjin 300071, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2001-06-28 Published:2001-06-28
  • Contact: XU Tongwen

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 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.

关键词: bipolar membrane;electric field;water dissociation;current-voltage characteristics

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.

Key words: bipolar membrane, electric field, water dissociation, current-voltage characteristics