Titanium Dioxide Semiconductor
Titanium Dioxide Semiconductor – Semiconductor Coatings – Cheersonic
Today’s energy and environmental crisis are two major problems faced by all mankind. Photocatalysis technology with semiconductor materials as the core (the technology of the 21st century dream) provides us with a way to use solar energy to achieve sustainable development. Photocatalytic pollutant degradation, sterilization, carbon dioxide reduction and photocatalytic hydrolysis of water to produce hydrogen all show great attraction and development prospects, and hydrogen energy is considered to be the cleanest energy in the 21st century. The traditional titanium dioxide (TiO2) semiconductor has shown great appeal in the field of photocatalysis due to its low cost, good chemical stability and environmental protection. However, the high electron-hole recombination rate and wide band gap of TiO2 limit its application. .
TiO2 forms strongly interacting heterojunctions with molybdenum disulfide and titanium nitride, respectively, and the obtained ternary composites have abundant and tight interfacial carrier channels. Molybdenum disulfide with tunable bandgap can be grown vertically on the surface of titania as a cocatalyst for titania, which can maximize the utilization of its edge-abundant catalytically active sites. However, due to the limited photogenerated electrons accepted by molybdenum disulfide, the photoelectrons generated by titanium oxide cannot be utilized to the maximum extent. Introducing a second cocatalyst might be a good option. Inspired by the sandwich structure, the researchers introduced the cocatalyst titanium nitride in situ on the other side of the titanium oxide. The nitrogen-oxygen bond between titanium oxide and titanium nitride ensures smooth carrier transport. The photogenerated electrons photoexcited from TiO2 migrate through the interface, while molybdenum disulfide and titanium nitride as photogenerated electron harvesters expose a large number of catalytically active sites for proton reduction reaction.
Imagine that the migration effect of a large number of carriers on a limited country road is obviously not as good as that of multiple highways. Therefore, the double-promoter-modified complex promotes the separation of electrons and holes, broadens the light absorption range of TiO2, and achieves a hydrogen production performance of 128.77 µmol g−1 h−1. Through energy band structure analysis, the researchers further analyzed the photocatalytic hydrogen production mechanism of ternary composites. This work provides a new idea for the design of titania-based photocatalysts and a new reference for the migration pathway of photogenerated electrons in ternary composites. It is believed that in the near future, TiO2, an ancient and classic old tree, will burst out with infinite vitality, bloom new flowers, and benefit all mankind, because it is a material born for the sun.
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