冷等离子体强化制备TiO_2光催化材料及其机理

Preparation of Photocatalytic TiO_2 via Plasma Intensification and Its Mechanism

等离子体技术在材料制备和改性方面的优势得到众多研究者的认可。Ti O2具有化学稳定性高、氧化活性强、生产成本低等优势,被广泛应用于太阳能电池和光催化领域。本文综述了近年来介质阻挡放电等离子体在强化制备Ti O2光催化材料方面的研究成果,包括等离子体辅助制备Ti O2光催化薄膜和Ti O2的等离子体法掺杂两个方面,并分析了其作用机理。从目前的研究成果来看,等离子体技术制得的Ti O2光催化材料具有更好的均匀性和催化活性,这主要得益于等离子体中的高能电子,一方面,Ti O2粒子吸附电子,彼此之间产生静电场的斥力作用,可以抑制颗粒的团聚,另一方面,电子的强还原能力,能够打断Ti-O键,形成氧空位,从而提高其催化性能。

It is commonly recognized that plasma has advantages on material preparation and modification. TiO2 , widely used in the research fields of solar cells and photocatalysis, is characterized by high chemical stability, higher antioxidant activity, lower production cost and so on. This paper reviews the preparation of photocatalytic TiO2 by dielectric barrier discharge （DBD） intensification, including the plasma assistant preparation of photocatalytic TiO2 thin films and the doped TiO2 by plasma, and the mechanism is analyzed. According to the research results, the photocatalytic TiO2 prepared by plasma has better uniformity and catalytic activity, which can be ascribed to the electrons with high energy. Firstly, TiO2 particles can adsorb electrons and produce electrostatic repulsive force, hindering the agglomeration of particles. Moreover, the election with high reduction capability can break the Ti-O bond, forming oxygen vacancy and enhancing its catalytic performance.