Nafion基氧化还原聚合物在空气中的电荷传输性能

利用三明治电池和伏安法测试了不同制备条件的Nafion基氧化还原聚合物膜在空气中的电荷传输性能. 研究结果表明, 混合适量聚乙二醇(PEG)的Nafion基金属联吡啶配合物{NafionM(bpy)2+3, PEG](M=Ru, Fe)}膜的表观电荷传递扩散系数(Dct)达到10-6-10-7 cm2·s-1 , 电子或空穴迁移率(μ)达到10-4-10-5 cm2·V-1·s-1. 在导电玻璃(ITO)电极与Nafion基氧化还原聚合物膜界面引入一层导电聚苯胺(PANI)后, 降低了其接触电阻, 使氧化还原聚合物膜的Dct提高至10-5-10-6 cm2·s-1, μ提高至10-3-10-4 cm2·V-1·s-1, 且工作电流提高了近两个数量级. 该固态氧化还原聚合物膜的性能比较稳定, 在空气中放置30天后其Dct和μ降低得很少.

Charge Transport Performance of Nafion-based Redox Polymer in Atmosphere

The charge transport performance of the Nafion-based redox polymer films prepared under different conditions was investigated by cyclic voltammetry in the sandwiched cells. The results showed that the apparent charge transfer diffusion coefficient(Dct) of the NafionM(bpy)2+3, PEG (polyethylene glycol)] (M=Ru or Fe) films is about 10-6-10-7 cm2·s-1 and the mobility of the electron or hole ( μ) was about 10-4-10-5 cm2·V-1·s-1. In order to decrease the resistance of the interface, a polyaniline (PANI) layer was added to the interface of indium tin oxide coated conducting glass (ITO) electrode and the redox polymer. Consequentially , the Dct could be increased to about 10-5-10-6 cm2·s-1 and μ to about 10-3-10-4 cm2·V-1·s-1, and the operating current of the cells under 600 mV bias could be increased by almost 100 times . In addition, the Dct and μ of this redox polymer film had just reduced slightly after 30 d kept in atmosphere. Therefore, the redox polymer film is sufficiently stable.