Since 1972, Japanese scientists found that the use of titanium dioxide (TiO2) as the electrode can photolysis of hydrogen production , how to efficiently utilize TiO2 catalysts for producing hydrogen become a hot topic of scientific research. Recently, the Chinese Academy of Sciences Research Fellow Yang Xueming DICP research team in terms of hydrogen production mechanism of TiO2 make progress , will open up new ways to develop efficient catalysts .
The team used high-sensitivity mass spectrometry -based surface photochemical device developed by systematically studied monolayer (ML) of methanol -covered TiO2 reaction kinetics after UV irradiation . Studies have shown that the introduction of methanol to improve the TiO2 photocatalytic decomposition of water, hydrogen production efficiency, while methanol itself can photocatalytic hydrogen production . The study also found that the methanol molecules in single crystals of anatase (101 ) surface photochemical behavior and rutile ( 110 ) surface is very similar. In light process, methanol molecules dissociate to produce formaldehyde molecule , methyl molecules further generate product , and it will generate a lot of dissociated hydrogen atoms. In the subsequent heating process , about 40% of the hydrogen atoms on the bridge oxygen to form hydrogen desorbed , which explains the high efficiency of hydrogen causes the surface of anatase single crystal ( 101 ) .
At the molecular level of methanol in-depth understanding and study of the mechanism of different surfaces in hydrogen production , for environmental governance , efficient solar energy conversion catalysts , clinical medicine , construction, development of transport materials industry needed to provide more ways .
Prior studies have proven the most widely photocatalyst can absorb a high activity of 4% to 5 % of sunlight , this good stability of the catalyst , non-toxic , inexpensive, without adding other chemicals can decompose organic contaminants, oxidation and reduction process at the same time , can oxidize other advanced oxidation stability can not be decomposed organic matter . Currently , to develop into a TiO2 photocatalytic technology there are still many practical difficulties, such as the hair should be slow, low quantum efficiency, we must improve the performance of the catalyst itself fundamentally solve these problems.（http://www.lubonchem.com supply）