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为了研究Pt/TiO_2作为光解水催化剂的功能,我们用电化学动电位扫描方法(包括循环电位扫描和线性电位扫描),考察了TiO_2和Pt/TiO_2上的电极过程。发现在TiO_2表面上在半导体能隙电位范围内,仅有微弱的授受电子的能力。而担Pt以后,由于金属Pt和TiO_2载体之间的相互作用,在禁带中出现了原来没有的能级,为传递电子打开了通道,使Pt/TiO_2比TiO_2有高得多的活性。实验还说明,由于表面能态的存在,在Pt/TiO_2—水溶液界面上受光辐照时,可能在光解水反应的同时还发生溶氧反应,导致复杂的光解水反应,在放氢的同时还生成H_2O_2等其它氧的还原产物。
In order to investigate the function of Pt / TiO_2 as a photolysis water catalyst, we investigated the electrode processes on TiO_2 and Pt / TiO_2 with electrochemical kinetic potential scan method (including cyclic potential scan and linear potential scan). It is found that there is only a weak ability to accept electrons on the surface of TiO 2 in the potential gap of semiconductor gap. However, due to the interaction between the Pt and TiO 2 carriers, Pt originally appeared in the forbidden band, which opened the channel for the transfer of electrons and made Pt / TiO 2 much more active than TiO 2. The experiment also shows that due to the existence of surface energy states, when irradiated by light at the interface of Pt / TiO_2-water solution, the reaction of photolysis and dehydration may occur at the same time, which leads to the reaction of photolysis and dehydration, At the same time also generate H_2O_2 other oxygen reduction products.