期刊
CHEMSUSCHEM
卷 12, 期 24, 页码 5246-5252出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201901712
关键词
CO2 conversion; core-shell nanoparticles; photocatalysis; solar fuels; X-ray diffraction
资金
- Engineering and Physical Sciences Research Council [EP/K021796/1]
- Research Centre for Carbon Solutions (RCCS) at Heriot-Watt University
- EPSRC Capital for Great Technologies Grant [EP/L017008/1]
- EPSRC [EP/K021796/1] Funding Source: UKRI
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 degrees C. As a result, TiO2(B), a magneli 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.
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