光催化被认为是降解毒性污染物最具发展前景的新技术之一，如何提高能量效率是其面临的主要科学问题。异质结材料虽然能够有效促进光生电荷分离，提高能量效率，但是其代价是氧化还原能力降低，限制了其在毒性污染物降解领域的应用。本研究提出构建隧道结光催化材料，利用其特殊的光生电荷电荷迁移方式，在确保有效促进光生电荷分离的前提下能够利用高氧化还原能力的光生电荷降解污染物，实现光催化技术对有毒污染物的高效治理。拟开展的研究工作对开发隧道结材料的制备技术，深入了解其光生电荷迁移和调控机制，并探索其在光催化领域的应用途径具有指导意义。

The photocatalysis is considered as one of the most promising techniques for the control of toxic pollutants. However, the low energy efficiencies of the technology in pollution control is currently one of the major problems that restrict its practical application. Heterojunction photocatalysts can improve the photogenerated charge separation and sequentially enhance the energy efficiency, however its oxidation and reduction capabilities are weakened，and this disadvantage limited the development of heterojunction photocatalyst in toxic pollutant control. In the project, tunnel junction with the unique photogenerated charge transfer approach will be introduced in area of pollution control. It can provide photogenerated electrons with high reduction capability and holes with high oxidation capability.Therefore,it is reasonable to expect that the tunnul junction can carry out good performance in both pollutant degradation and light energy conversion.The results are significant for the design and synthesis of tunnel junction as photocatalysts, detection of their photogenerated change transfer and control method, and their application in the pollution control.