Abstract
Black brookite TiO2 single-crystalline nanosheets with outstanding photocatalytic activity toward CO2 reduction is prepared by a facile oxidation-based hydrothermal reaction method combined with post-annealing treatment. Large amount of Ti3+ defects are introduced into the bulk of brookite nanoparticles, which increases the solar energy absorption and enhances the photocatalytic activity.
Highlights
The emission of greenhouse gases, carbon dioxide (CO2), could result in the global climate change and unhealthful regional air quality[1,2]
When the temperature reaches 700 °C, no rutile or anatase characteristic diffraction peaks were detected, indicating that the brookite phase can be stabilized at higher temperatures
The morphology of the synthesized brookite powders is investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) as shown in Fig. 1b,c, respectively
Summary
The emission of greenhouse gases, carbon dioxide (CO2), could result in the global climate change and unhealthful regional air quality[1,2]. CO2 photoreduction in engineered systems, still faces severe challenges like low conversion yields and quantum efficiencies due to fast electron-hole recombination, narrow sunlight absorption range, and backward reactions[3,4,5,6]. Strategies to resolve those challenges have been a research hotspot in the area[7,8,9,10]. The black brookite TiO2−x (T500) shows drastically enhanced visible-light absorption and exhibits excellent photocatalytic activity toward CO2 reduction
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