Mechanisms and Applications of Photocatalytic Reactions in the Gas Phase

气相光催化反应机理及应用

基本信息

批准号：
14050028
负责人：
TATSUMA Tetsu
金额：
$ 34.75万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2006
项目状态：
已结题

项目摘要

Major mechanisms of photocatalytic remote oxidation and photocatalytic lithography were revealed to be as follows: hydrogen peroxide generated on a photocatalyst diffuses in the gas phase, followed by photolysis to hydroxyl radicals, which are the active species. Photocatalytic lithography was applied to development of multichannel biosensor arrays.Regarding electron exchange between a photocatalyst with redox-active solids and the application to energy storage photocatalysts, photo-induced electron transfer and proton transport from TiO_2 to WO_3 and MoO_3 were studied. Quantum efficiencies and capacities of the reductive energy storage and effects of adsorbed water on the energy storage were studied. It was found that electron transfer is possible from Ni(OH)_2 to holes in photo-excited TiO_2. A TiO_2-Ni(OH)_2 composite film works as an oxidative energy storage photocatalyst. It should be able to remove some harmful compounds such as formaldehyde even after dark. An Ir oxide and a Ru oxide exhibit higher oxidation abilities as oxidative energy storage materials.Regarding plasmon photoelectrochemistry of metal nanoparticles-semiconductor systems, multicolor photochromism of Ag nanoparticles-TiO_2 systems was found. In the mechanistic study of the photochromism, it was found that photo-induced charge separation at the metal nanoparticle-semiconductor interface plays an essential role. The charge separation process can be applied to solar cells and photocatalysis. I was evidenced that photoelectrochemical dissolution of Ag nanoparticles resonant with an incident light and deposition and growth of non-resonant Ag nanoparticles are responsible for the spectral changes.Au nanostructures were developed and nanopyramids were found to exhibit a broad plasmon resonance band. Photoelectrochemical actuators, which swell and shrink in response to light were developed. Biosensors based on algal phototaxis were also developed.

光催化远程氧化和光催化光刻的主要机制被揭示如下：光催化剂上产生的过氧化氢在气相中扩散，然后光解为羟基自由基，羟基自由基是活性物质。将光催化光刻技术应用于多通道生物传感器阵列的开发。针对光催化剂与氧化还原活性固体之间的电子交换及其在储能光催化剂中的应用，研究了TiO_2到WO_3和MoO_3的光诱导电子转移和质子传输。研究了还原储能的量子效率和容量以及吸附水对储能的影响。研究发现电子可以从Ni(OH)_2转移到光激发TiO_2中的空穴。 TiO_2-Ni(OH)_2复合薄膜作为氧化储能光催化剂。即使在天黑后，它也应该能够去除甲醛等一些有害化合物。 Ir氧化物和Ru氧化物作为氧化储能材料表现出较高的氧化能力。在金属纳米粒子-半导体体系的等离子体光电化学方面，发现了Ag纳米粒子-TiO_2体系的多色光致变色现象。在光致变色机理研究中，发现金属纳米颗粒-半导体界面处的光致电荷分离起着至关重要的作用。电荷分离过程可应用于太阳能电池和光催化。我证明，与入射光共振的银纳米颗粒的光电化学溶解以及非共振银纳米颗粒的沉积和生长是造成光谱变化的原因。开发了金纳米结构，并发现纳米金字塔表现出宽的等离子体共振带。开发了能够响应光而膨胀和收缩的光电化学执行器。还开发了基于藻类趋光性的生物传感器。