Abstract
To promote the interaction of p–n semiconductors, raspberry‐like microspheres of core–shell Cr2O3@TiO2 nanoparticles have been fabricated through a five‐step process. Raman spectroscopy of products calcined at various temperatures reveal that the titania shell causes crystal distortion of the Cr2O3 core, without changing the microstructures of the fabricated core–shell microspheres. In situ and time‐resolved synchrotron‐based powder XRD reveals the formation of monoclinic TiO2 in the fourth step, but these monoclinic TiO2 nanocrystals undergo a phase transition when the applied calcination temperature is above 550 °C. As a result, TiO2(B), a magnéli phase of Ti4O7 and Cr2Ti6O15 compounds, resulting from inner doping between Cr2O3 and TiO2, is formed. The close interaction of Cr2O3 and TiO2 forms a p–n junction that decreases the recombination of photogenerated electron–hole pairs, leading to enhanced production of CH4 by photocatalytic reduction of CO2.
Highlights
In contrast to the use of fossil fuels and associated adverse global environmental effects, solar energy has the potential to provide our energy demands if it can be efficiently harvested and transformed
The laboratory and synchrotron-based powder X-ray diffraction (PXRD) patterns of the likely a result of magnØli Ti4O7.[23]. The peaks centered at 302.6, 349.2, 523.6, 551.2 and 611.3 cmÀ1 can be assigned to crystalline Cr2O3 (Figure 1 B).[24]. The pattern of these peaks did not change with increasing calcination temperatures, but the inas-prepared Cr2O3 revealed high crystallinity and the peaks matched well with Cr2O3 in the database
The Raman intensity of the Cr2O3@TiO2 nanocomposites increased with calcination temperature compared with the pristine Cr2O3
Summary
In contrast to the use of fossil fuels and associated adverse global environmental effects, solar energy has the potential to provide our energy demands if it can be efficiently harvested and transformed. Cao et al reported that the inner doping of Cr on TiO2 thin films could significantly enhance the photo(electro)catalytic water splitting efficiency.[17] Recently, Zhao and co-workers proposed that the use of core–shell structures offers an excellent system for light/chemical CO2 photoreduction. Duction reaction to CH4.[18] The group proposed the fabrication of core–shell bimetallic (i.e., Au@Pd and Pt@Ru) nanoparticles decorated on TiO2 to enhance the optical properties of TiO2, reduce the recombination of photogenerated charges and improve the CO2 adsorption capability for CO2 photoreduction.[19] In addition, the product selectivity of CO2 photoreduction can be tuned through adjusting the. Using in situ and time-resolved synchrotron-based powder X-ray diffraction (PXRD) and Raman spectroscopy, the change of crystal phase of the fabricated Cr2O3@TiO2 nanocomposite with increasing calcination temperature was ob-.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
