基于非碘氧化还原对及固态电解质染料敏化太阳能电池的研制

发布时间：2018-06-26 03:47

本文选题：染料敏化太阳能电池 + 离子液体　；参考：《苏州大学》2014年博士论文

【摘要】：目前I/I3是染料敏化太阳能电池(DSSCs)中应用最广泛的氧化还原电对，但I/I3体系存在对金属导线有强的腐蚀性、具有较低的氧化还原电势，及对光的竞争性吸收等缺点。这些缺点限制了DSSC光电转换效率的提高及其应用。针对以上问题，本论文主要研究了功能性离子液体添加剂和非碘氧化还原对的设计与合成，以及它们在DSSCs中的应用；探索了利用界面改性提高固态电解质与光阳极的界面相容性，提高固态电解质DSSCs的光电转换效率。具体研究内容主要包括以下几个方面： (1)设计合成了吡啶功能化的离子液体添加剂，，用以取代传统的有机溶剂添加剂，并考查了不同浓度的添加剂对电池性能的影响。光电流-电压曲线表明这种新型添加剂在低浓度下能实现高的电池效率，甚至高于常用的具有挥发性的有机溶剂添加剂，并显示较好的稳定性。这类新型的离子液体添加剂能克服挥发性的有机溶剂添加剂的缺点。 (2)设计合成了具有离子液体功能的钴（III/II）配体氧化还原电对，循环伏安表明这种新的钴电对具有较高的氧化还原电位，并且这种新的钴（III/II）配体电对在离子液体体系里具有高的溶解性，在离子液体电解质体系中，光强100mW/cm2的测试条件下，电池的效率可达7.37%。 (3)通过利用表面活性剂修饰TiO2光阳极，制备具有较高光电转换效率的塑性晶体固态电池。光电流-电压曲线，接触角，固态紫外吸收等测试结果表明AerosolOT（AOT）作为表面活性剂修饰光阳极能使电解质与吸附染料的光阳极表面得到更好的接触，减少了TiO2导带与电解质中的I3的电子复合作用，从而使电池的效率得到很大的提高。这种用表面活性剂修饰TiO2光阳极的方法为全固态DSSC效率的提高提供了一种新的思路。
[Abstract]:At present, I / I _ 3 is the most widely used redox pair in dye sensitized solar cells (DSSCs), but I / I _ 3 system has some disadvantages such as strong corrosion to metal wires, low redox potential and competitive absorption of light. These shortcomings limit the efficiency of DSSC photoelectric conversion and its application. In order to solve the above problems, the design and synthesis of functional ionic liquid additives and non-iodine redox pairs and their applications in DSSCs were studied in this paper. The interface compatibility between solid electrolyte and photoanode was improved by interfacial modification, and the photoelectric conversion efficiency of DSSCs was improved. The specific research contents include the following aspects: (1) the functional ionic liquid additives of pyridine were designed and synthesized to replace the traditional organic solvent additives. The effect of different concentration of additives on the performance of the battery was investigated. The photocurrent-voltage curves show that the new additive can achieve high battery efficiency at low concentration, even higher than the volatile organic solvent additives, and show good stability. This new ionic liquid additive can overcome the disadvantages of volatile organic solvent additives. (2) the ligands of cobalt (III / II) with ionic liquid function have been designed and synthesized. Cyclic voltammetry shows that the new cobalt pair has high redox potential, and the new cobalt (III / II) ligand pair has high solubility in ionic liquid system. In ionic liquid electrolyte system, the light intensity is 100 MW / cm ~ 2. The efficiency of the battery can reach 7.37. (3) by modifying TiO2 photoanode with surface active agent, the plastic crystal solid state battery with high photoelectric conversion efficiency is prepared. The results of photocurrent-voltage curve, contact angle and solid-state ultraviolet absorption showed that AerosolOT (AOT) as a surfactant modified photoanode could better contact the electrolyte with the photoanode surface of dye adsorption. The electron recombination of TIO _ 2 conductance band and I _ 3 in electrolyte is reduced, and the efficiency of the battery is greatly improved. The method of modifying TiO2 photoanode with surfactants provides a new way to improve the efficiency of all solid DSSC.
【学位授予单位】：苏州大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM914.4;O646

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