Hydrogen Plasma Reduction of Titanium Dioxide, Absorption Spectroscopy, PEC (AFM 2013)
Preparation of nanometer black titanium by low temperature aluminum reduction method and its thermodynamic analysis (EES 2013)
Black Sulfur-Doped Rutile Titanium Dioxide Preparation Diagrams, Absorption Spectra, and Photoelectric Conversion (JACS 2013)
Two-step method for non-metallic doping of black titanium dioxide (EES 2014)
As an important new energy source and environmental protection material, titanium dioxide is widely used in photocatalysis, solar power generation, and solar energy collectors. However, the solar energy utilization of titanium dioxide faces enormous challenges, mainly due to the narrow light absorption range and low separation efficiency of electron-hole pairs. Titanium dioxide can only absorb ~5% of ultraviolet light in the solar spectrum, and cannot use the energy of visible light and near-infrared light; the intrinsic conductivity is only ~10-10 S/cm, which is not conducive to the separation and transmission of photoelectron-hole pairs. . These problems have seriously affected the widespread use of titanium dioxide in the energy and environmental fields and are unable to make full use of solar energy.
Recently, the Shanghai Institute of Ceramics, Chinese Academy of Sciences, and the School of Chemistry of Peking University have conducted cooperative research. Huang Fuqiang, Wang Zhou, Yang Zhongyi, Lin Tianquan and other researchers have developed a variety of new preparation methods (hydrogen plasma method, aluminum reduction method, The two-step non-metallic doping method greatly improves the absorption of visible light and near-infrared light in the solar spectrum. The effect is obvious.
These newly discovered black titanium dioxide nanocrystals, unlike the high temperature hydrogen-reduced black titanium oxide, are a core-shell structure, the core region is still crystalline titanium dioxide, and the shell is an amorphous structure in which the disordered shell is white titanium dioxide. Turns into a black functional area, and the disordered shell contains oxygen vacancies or non-metal X-doping (X = H, N, S, I). This structure can result in absorption of sunlight up to 85%, far superior to the literature (30%).
Good solar spectrum absorption, chemical and physical stability, and improved carrier concentration and electron migration performance can meet the requirements of high-efficiency solar energy. Among them, nitrogen-doped nano-black TiO 2 catalyzes the decomposition of water by sunlight, and the hydrogen production rate reaches 15 mmol h-1 g-1, which is among the best reported visible light catalysts; the degradation rate of organic pollutants is commercial nano TiO 2 (P25) four times. The black TiO2 nanotube array was used as a photochemical cell (PEC) electrode, and the conversion efficiency of light energy to hydrogen chemical energy reached 1.67%, which was the optimal value for the conversion efficiency of titanium dioxide-based PEC.
The research results have been featured by Chemistry Views on the topic of Titania: Black is the New White. It is considered that there are promising applications in the fields of new energy (solar power generation, photocatalytic hydrogen production) and environment (pollution degradation, antibacterial disinfection). . International companies and universities have already purchased small batches of samples for environmental protection applications. Some of the findings are published in J. Am. Chem. Soc. (2013), Adv. Funct. Mater. (2013), Energy Environ. Sci. (2013, 2014), Chem. Euro. J. (2013) and others. Has applied for 3 invention patents.
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