DESIGN OF NEW PHOTOFUNCTIONAL MATERIALS BASED ON EXFOLIATED TWO DIMENSIONAL OXIDES

基于剥离二维氧化物的新型光功能材料的设计

• 批准号: 08554028
• 负责人: DOMEN Kazunari
• 金额: $ 2.5万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08554028/
• 关键词: photofunctional materials; two dimensional compounds; exfoliation; ion exchange; intercalation; K_4Nb_6O_<17>; ソフトケミカル; メソポーラス多孔体; MgO微粒子

Photocatalysts recently attract a great attention from the view point of eco-friendliness. However, already found photocatalysts do not avail the visible light which dominates the solar light. Although several materials such as CdS were found to utilize the visible light, the eco-harm nature of them is the great disadvantage. We have found that the ion-exchangeable transition metal oxides are promising catalysts which have the photoresponse in visible light region. The serious problem of those materials are that their high interlayr electron density inhibit the intercalation of reactants and that the interlayr spase has not been efficiently utilized. On the other hand, the use of intercalation of organic ions such as tri-butyl-ammonium ion (TBA+) enabled the exfoliation of the layr to produce macropolyanion sheets highly dispersed in water. Furthermore, the dispersed two dimensional inorganic sheets were found to be starting materials of microporous materials and inorganic thin films. These novel materials demonstrated higher photoactivity than the original transition metal oxide and showed different chemical nature. The new types of layred materials were synthesized and are expected to be utilized as functional materials.

近年来，光催化剂从环境友好的角度引起了人们的极大关注。然而，已经发现的光催化剂并不能利用支配太阳光的可见光。虽然一些材料，如镉，被发现利用可见光，但它们的生态危害性质是很大的劣势。我们发现，可离子交换的过渡金属氧化物是一种在可见光范围内具有光响应的很有前景的催化剂。这些材料的严重问题是其高的层间电子密度抑制了反应物的插层，并且层间空间没有得到有效的利用。另一方面，使用三丁基铵离子(TBA+)等有机离子的插层使LAIR的剥离能够产生高度分散在水中的大分子聚阴离子片层。此外，还发现分散的二维无机薄片是微孔材料和无机薄膜的起始材料。这些新材料表现出比原来的过渡金属氧化物更高的光活性，并表现出不同的化学性质。合成了新型铺层材料，有望作为功能材料使用。

项目成果

T.TAKATA: "highly active photocatalyst for overall water splitting with a hydrated layred perovskite structure" J.Photochem.Photobiol., A : Chemistry. 106. 45-49 (1997)

T.TAKATA：“具有水合层状钙钛矿结构的用于整体水分解的高活性光催化剂”J.Photochem.Photobiol.，A：化学。

R. Abe: "Preparation of porous niobium oxides by soft-chemical process and their photocatalytic activity" Chem. Mater. 9・10. 2179-2194 (1997)

R. Abe：“软化学法制备多孔铌氧化物及其光催化活性”Mater. 9・10（1997）。

T.Takata: "Photocatalytic decomposition of water on spontaneously hydrated layered perovskite" Chem.Mater.9. 1063-1064 (1997)

T.Takata：“自发水合层状钙钛矿上水的光催化分解”Chem.Mater.9。

A.Tanaka and K.Domen: "Photocatalytic Properties of Some Ion-Exchangeable Layered Oxides" Critical Rev.Surf.Chem.(in press.). 167-174 (1996)

A.Tanaka 和 K.Domen：“一些离子交换层状氧化物的光催化性能”Critical Rev.Surf.Chem.（正在印刷中）。

T.Takata: "A highly active Photocatalyst for overall water splitting with a hydrated layered perovskite structure" J.Photochem.Photobiol.,A : Chemistry. 106. 45-49 (1997)

T.Takata：“一种具有水合层状钙钛矿结构的用于整体水分解的高活性光催化剂”J.Photochem.Photobiol.,A：化学。