题 目：基于TiO2纳米材料的染料敏化太阳能电池
主讲人：朱正涛 副教授（Tenured Associate Professor）
地 点：纪忠楼YF-102
时 间：2016年4月14日(周四)下午15:30-17:00
主讲人简介：
朱正涛，博士，副教授，现任职于南达科他矿业理工学院（South Dakota School of Mines and Technology）。朱博士分别于1992年和1995年取得复旦大学高分子材料的学士和硕士学位，于2002年在美国纽约州立大学（the State University of New York at Binghamton）取得材料化学博士学位，之后在康奈尔大学（Cornell University, 2002-2004）和伊利诺伊大学厄巴纳-香槟分校（University of Illinois at Urbana-Champaign, 2004-2006）从事博士后研究。朱博士于2006年开始在南达科他矿业理工学院任助理教授，并于2012年晋升具有终身教职资质的副教授（Tenured Associate Professor)。主要的研究方向是纳米材料和器件在能源的转换和储存，柔性电子器件，化学传感器等方面的应用，共发表论文50余篇，相关研究获得美国自然科学基金，美国航天局，美国化学会等机构的资金支持。
报告内容：
Titanium oxide (TiO2) nanomaterials have attracted growing interests for applications in energy conversion and storage applications (e.g., photovoltaics, water splitting, photocatalysis, hydrogen storage, and Li-ion batteries) due to their optical/electrochemical properties, chemical/environmental stability, and cost effectiveness. In this talk, I will present our studies on one-dimensional (1D) TiO2 nanostructures prepared by electrospinning technique for dye-sensitized solar cell (DSSC) applications. 1D TiO2 nanofibers and the composite of TiO2 nanofibers/nanoparticles were evaluated as photoanodes of DSSCs. The charge transport and recombination in the photoanodes were characterized by the dark current, photovoltage as a function of light intensity, and transient photovoltage and photocurrent measurements. The results indicate that the addition of 1D TiO2 nanostructures into the photoanodes leads to substantial reduction of electron recombination and improvement of the charge collection efficiency. This is due to highly crystalline grains with fewer grain boundaries in 1D TiO2 nanostructures as observed in structural characterizations. Further, flexible and high-temperature durable photoanode based on a hybrid mat of the TiO2/SiO2 nanofibers impregnated with TiO2 nanoparticles was developed. In the flexible photoanode, the TiO2 nanoparticles enhance the dye loading, the TiO2 nanofibers improve the electron transport, and the SiO2 nanofibers provide the mechanical strength/flexibility. The DSSC based on this composite photoanode achieves a power conversion efficiency of 6.74 ± 0.33% on FTO/glass substrate. The freestanding composite mat of TiO2 nanoparticles and electrospun TiO2/SiO2 nanofibers, as well as the preparation methods, not only is ideal for flexible DSSCs, but also can be applied for a broad range of flexible and low-cost energy conversion devices.
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