成果報告書詳細
管理番号20120000000527
タイトル*平成23年度中間年報 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2013/7/27
報告書年度2011 - 2011
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
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果
光電極用酸化チタンの安価・高速量産手法の開発を目的として、マイクロ波水熱反応装置による合成スクリーニングを行い、水熱反応の条件確立を進めた。チタン原料には、アルカリ性で均一溶解する層状チタン酸コロイドを用いて、昨年度に引き続き微粒子合成を行った。高速水熱反応の際、特に、ナノ構造制御試薬であるSDA (Structure Directing Agent)として、有機酸やアミン等を用いて、結晶成長の抑制や異方性発現に影響する因子を調べ、サイズ、形態、表面積等の結晶構造に関する基礎物性を明らかにした。SDA分子には、クエン酸のみならず、アロマティックな主骨格を有する水溶性色素分子を用いて、より高度なナノ構造制御を目指した。
英文要約Title: Rapid synthesis of highly structure-controlled TiO2 nanoparticles and development of their film production methods (FY2010-FY2011) FY2011 Annual Report
We have developed a cost-effective method for synthesizing highly crystallized TiO2 nanoparticles as photoelectrode materials for high-performance dye-sensitized solar cells (DSCs).
1.This research is focused on the rapid nanostructure control of TiO2 particles by a microwave hydrothermal reaction in the presence of organic structure directing agents (SDA). Microwave heating of the alkaline homogeneous solution of layered colloidal titanates and use of citric acid as the SDA allowed us to rapidly produce size-tunable anisotropic TiO2 nanocrystals within 60 min. The particular importance lies in (i) the rapid nanostructure formation of anisotropic TiO2 particles with zigzag anatase (101) crystal planes by the controlled oriented attachment of titanate, and (ii) the high-performance photoelectrode property for even thicker films and their high dye-adsorption capacity, which contribute to increased incident photon-to-current conversion efficiency (IPCE). DSCs employing the mesoporous film adsorbed with N719 dye exhibited a remarkably high IPCE of 86% with the light-to-electricity conversion efficiency of 8.3% achieved without using a light scattering layer.
2.We have also examined the rapid hydrolysis of titanium tetraisopropoxide (TTIP) by using a flow-type supercritical reaction system, where a Ti(IV) precursor was prepared by mixing TTIP and triethanolamine as the SDA in water. Notably, the reaction at 400°C and 30MPa was completed in less than several seconds. The pH control of reaction mixtures allowed the flexible structure control of anatase TiO2 nanocrystals. The anisotropic growth of TiO2 single crystals with a nanowire shape was achieved at pH12.5, whereas highly-crystallized TiO2 nanoparticles with an approximate size of 20nm~30nm formed at pH4~pH11.5. DSCs built from the TiO2 nanoparticles exhibited a comparable light-to-electricity conversion efficiency to that of the Degussa P25 cell. Our findings suggested that designing molecular scaffolds as the SDA will open up new perspectives for the development of a wide range of nanostructured TiO2, which needs to be optimized for different 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 to their use in high performance DSCs.
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