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Studies on rapid molecular diffusion and charge propagation in a quasi-solid of nanostructured polymers

纳米结构聚合物准固体中快速分子扩散和电荷传播的研究

基本信息

批准号：
15550101
负责人：
KANEKO Masao
金额：
$ 2.37万
依托单位：
Ibaraki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15550101/
关键词：
Polysaccharide solid Solid state electrochemistry Diffusion coefficient of molecules Ionic conduction Alternating current impedance spectroscopy Redox molecules Cyclic voltammogram Dye-sensitized solar cell 多糖類擬固体拡散係数サイクリックボルタモグラム

项目摘要

A quasi solid composed of double helical nanoheterostructured polysaccharide network involving excess water was prepared by heating an aqueous solution of the polysaccharide utilizing microwave irradiation and by the following cooling and solidification. The solid was prepared in the presence of various redox molecules and before cooling down three electrodes (working, counter, and reference) were soaked in the hot solution to prepare a solid involving redox compound installed with three electrodes. Thus, solid state electrochemical measurements were for the first time realized. The ionic conductivity, electrochemical reactivity and diffusion coefficient of molecules in the solid were analyzed by cyclic voltammetry and alternating current impedance spectroscopy. It was shown that electrochemical reactions and molecular diffusion depend on the polysaccharide concentration and the redox compound structure in the solid, so that the behavior was analyzed in relevance to the charge propagat … More ion mechanism through the redox molecules.As for the polymers, agarose, carageenan, agar, etc. were used. Ionic conductivity by various ions was measured. As for the redox molecules to study molecular diffusion, Ru(bpy)_3^<2+> with sensitizing ability, various metal complexes with various catalysis function (cyano complexes, ammine complexes, Prussian Blue, etc.), and methylviologen were used. Fundamental data of ion diffusion and ionic conductivity were accumulated. It was clarified that conductivity by small ions is the same as in an aqueous solution. Alternating current impedance spectroscopy exhibited interesting results that the resistance for charge transfer and double layer capacitance on the electrode surface is larger than those in an aqueous solution, but that the resistance for charge transport decreases with the increase of the polysaccharide concentration. By utilizing these solids photosensor of humidity was fabricated. The solid was successfully applied to solidify the organic liquid electrolyte solution in a dye-sensitized solar cell, giving almost similar conversion efficiency for the solid type cell as a liquid type one. Less

通过利用微波辐射加热多糖的水溶液并通过随后的冷却和固化来制备由涉及过量水的双螺旋纳米异质结构多糖网络组成的准固体。在各种氧化还原分子的存在下制备固体，并且在冷却之前，将三个电极（工作电极、对电极和参比电极）浸泡在热溶液中以制备包含安装有三个电极的氧化还原化合物的固体。因此，固态电化学测量首次实现。采用循环伏安法和交流阻抗法对固体中的离子电导率、电化学反应活性和分子扩散系数进行了分析。结果表明，电化学反应和分子扩散依赖于多糖浓度和固体中氧化还原化合物的结构，因此，该行为与电荷传播有关， ...更多信息对于聚合物，使用琼脂糖、卡拉胶、琼脂等。测量了各种离子的离子电导率。对于研究分子扩散的氧化还原分子，具有敏化能力的Ru（bpy）_3^<2+>，具有各种催化功能的各种金属配合物（氰基配合物、氨配合物、普鲁士蓝等），和甲基紫精。积累了离子扩散和离子电导率的基础数据。澄清了小离子的电导率与水溶液中的电导率相同。交流阻抗谱显示有趣的结果，电荷转移的电阻和双电层电容在电极表面上是大于在水溶液中，但电荷传输的电阻随多糖浓度的增加而减小。利用这些固体制作了湿度传感器。该固体被成功地应用于固化染料敏化太阳能电池中的有机液体电解质溶液，得到固体型电池与液体型电池几乎相似的转换效率。少