Dinitrogen Fixation Using Conducting Polymer/Titanium Oxide Junction

使用导电聚合物/氧化钛连接处固定二氮

• 批准号: 13640590
• 负责人: HOSHINO Katsuyoshi
• 金额: $ 2.5万
• 依托单位: Chiba University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640590/
• 关键词: Nitrogen Fixation; Titanium Oxides; Conducting Polymers; Organics; Inorganics Hybrid Materials; Semiconductors; Electrochemistry; Photocatalysts; Material Conversion

Nitrogen fixation systems driven by white light under mild conditions was investigated. The typical system consists of titanium oxide (TiO_x) and poly(3-methylthiophene)(P3MeT), and their heterojunction is previously shown to produce ammonium salt crystals (NH_4ClO_4) when exposed to white light in air at 20℃ and 40%RH. The purpose of this study is to identify the nitrogen-fixation products and to obtain the information on the fixation mechanism. X-ray photoelectron spectroscopic analyzes of the junctions before and after the photoirradiation revealed that ammonia is also formed as one of the fixation products. Additionaly, the combination of quantification of the products and electron-dispersive analysis of X-rays revealed that the reaction is initiated by annmonia formation (at the TiO_x/P3MeT interface) and followed by its partial conversion into NH_4ClO_4 in the P3MeT bulk. Further investigations showed the contribution of water molecules and polaron/biporaron species in the P3MeT film to the fixation reaction. These results led to the materials/device structures and increasing the efficiency of the light-to-chemical energy conversion.

研究了温和条件下白色光驱动的固氮系统。典型的体系由二氧化钛（TiO_x）和聚3-甲基噻吩（P3 MeT）组成，它们的异质结在20℃和40%RH的空气中暴露于白色光下时产生铵盐晶体（NH_4ClO_4）。本研究的目的是鉴定固氮产物并获得固氮机理的信息。X射线光电子能谱分析的交界处之前和之后的光照射显示，氨也形成的固定产品之一。此外，产物的定量分析和X射线电子色散谱分析表明，反应是由TiO_x/P3 MeT界面上的NH_2生成和P3 MeT本体中的NH_4ClO_4部分转化而引发的。进一步的研究表明，水分子和极化子/biporaron物种在P3 MeT膜的固定反应的贡献。这些结果导致了材料/器件结构的改进，并提高了光到化学能转换的效率。

项目成果

星野 勝義: "有機/無機半導体接合を用いた空中窒素固定"触媒. 44・5. 323-327 (2002)

星野胜义：“利用有机/无机半导体结的空中固氮”催化剂44・5。

Tomohisa Ogawa: "Visible-Light Sensitive, Highly-Reactive, and Long-Standing Nitrogen Fixation under Ordinary Pressure and Temperature"Journal of Physical Chemistry B. in press.

Tomohisa Okawa：“常压和温度下的可见光敏感、高反应性和长期固氮”《物理化学杂志》B. 出版中。

星野 勝義: "有機/無機半導体接合を用いた空中窒素固定"触媒. 44. 323-327 (2002)

Katsuyoshi Hoshino：“利用有机/无机半导体结进行空中固氮”催化剂，44. 323-327 (2002)

Tomohisa Ogawa: "Visible-Light Sensitive, Highly-Reactive, and Long-Standing Nitrogen Fixation under Ordinary Pressure and Temperature"Journal of Physical Chemistry B. (印刷中).

Tomohisa Okawa：“常压和温度下的可见光敏感、高反应性和长期固氮”《物理化学杂志》B.（出版中）。

Katsuyoshi Hoshino: "Dinitrogen Fixation Using Organic/Inorganic Hybrid Junctions"Catalysts & Catalysis. 44-5. 323-327 (2002)

Katsuyoshi Hoshino：“使用有机/无机混合连接的二氮固定”催化剂