成果報告書詳細
管理番号20130000000528
タイトル*平成24年度中間年報 最先端研究開発支援プログラム 低炭素社会に資する有機系太陽電池の開発 高度構造制御された酸化チタンナノ微粒子の高速合成及び製膜技術の開発
公開日2014/6/11
報告書年度2012 - 2012
委託先名国立大学法人岐阜大学
プロジェクト番号P09026
部署名新エネルギー部
和文要約
英文要約Title: Development of the methods for synthesizing TiO2 nanoparticles and evaluation of their photoelectrode properties (FY2010-FY2013) FY2012 Annual Report
Gifu University

We developed a cost-effective method for producing nanostructured TiO2 crystals via the rapid hydrothermal reactions of aqueous titanium precursors. In particular, we focused on relationships between TiO2 nanostructures and functions in dye-sensitized solar cells (DSSCs). Some of the controlled aspects of the TiO2 nanoparticles included size, morphology, and exposed crystal facets. The aim of this study was to optimize TiO2 nanostructures for different dye molecules and electrolytes.
A microwave rapid heating of the alkaline homogeneous solution of colloidal titanates and citric acids as the structure directing agent (SDA) allowed us to produce size-tunable anisotropic TiO2 nanorods within 60 minutes, which were proven to dominantly expose (101) facets. Among TiO2 samples with different aspect ratios, the DSSC photoelectrodes consisting of such nanorods with the mean width of 15nm, length of 38nm, and their V-shaped twins have the most significant advantage for increased light-to-electricity conversion efficiency of both N719 and D149-sensitized solar cells.
By using a flow-type supercritical water reaction system, the rapid hydrolysis of titanium tetraisopropoxide at 380°C and 30MPa, with triethanolamine as the SDA, produced the TiO2 nanoparticles with narrowly distributed sizes of around 20nm. The pH control of reaction mixtures lead to the flexible control of crystal facets of anatase TiO2 nanocrystals. Most notably, N719-sensitized DSSCs, built from the (101) dominant TiO2 nanoparticles, exhibited a marked improvement of incident photon to current conversion efficiency (IPCE) as compared to the DSSCs of analogous (103) facets-exposing TiO2 nanoparticles. This result is probably due to more efficient electron injection from excited dye molecules to the TiO2 electrodes for the (101) dominant TiO2 nanocrystals.
Our findings suggested that designing molecular scaffolds as the SDA will open new avenues for tailoring a wide range of nanostructured TiO2s, which need to be optimized for different dye sensitizers and electrolytes. In addition, it should be noted that the use of an aqueous precursor is environmentally benign. The results obtained by our synthetic strategy are thus promising for the low-cost production of functional TiO2 nanomaterials, whose applicability extends not only to their use in high performance DSSCs, but also to utilization in other renewable energy technologies such as photocatalysis and lithium ion batteries.
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