Coupling of Electron Transport to Ion Transport in Mosaic Membrane System as the Model of Biomembrane.

在具有电子传递区和离子交换区的镶嵌膜或由阳离子和阴离子交换膜和电子传递膜组成的镶嵌膜系统中，电子传递容易与离子传递耦合。电子和离子在氧化还原电位梯度或浓度梯度的驱动力作用下传输，耦合效率取决于电子传输膜（铂片）界面的表面电阻，表面电阻由质量传输过程和电子传输过程组成。传质过程的表面电阻是由扩散、对流和电迁移引起的，它取决于氧化还原物种的浓度、搅拌强度和支持电解质。电子传递过程的表面电阻主要由氧化还原物种的浓度和电位差决定。表面电阻随电位差的增大而线性增大。斜率和y截距依赖于氧化还原物种的浓度，y截距的电阻与循环伏安法测得的分解电阻一致，氧化还原链反应也提高了偶联效率。可见光照射和海水引起的高盐浓度梯度使电子在该体系中有效传输。

Electron transport is readily coupled to ion transport in a mosaic membrane with electron-transport regions and ion-exchange regions or a mosaic membrane system consisted of cation-and anion-exchange membranes and electron transport membranes. Electrons and ions are transported by the driving forces of the redox potential gradient or the concerntration gradient and the coupling efficiency depends on the surface resistance at the interface of the electron transport membrane, that is, platinum plate.The surface resistance is consisted of the mass transport process and the electron transport process. The surface resistance of the mass transport process is caused by the diffusion, the convection, and the electrical migration and it depends on the concentration of redox species, the stirring intensity, and the supporting electrolyte. The surface resistance of the electron transport process is dominated by the concentration of the redox species and the potential diffrence. The surface resistance increased linearly with the increase of the potential difference. The slope and the y intercept depend on the concentration of the redox species and the resistance of the y intercept agreed well with the decomposition resistance obtained by cyclic voliammetry.The coupling efficiency was also improved by the redox chain reaction. Electrons were transported efficiently in this system by the visual light irradiation and tha high salt concentration gradient caused by sea water.