Abstract
TiO2-x/W18O49 with core-shell or double-shelled hollow microspheres were synthesized through a facile multi-step solvothermal method. The formation of the hollow microspheres with a double-shell was a result of the Kirkendall effect during the solvothermal treatment with concentrated NaOH. The advanced architecture significantly enhanced the electronic properties of TiO2-x/W18O49, improving by more than 30 times the CO2 photoreduction efficiency compared to the pristine W18O49. Operando DRIFTS measurements revealed that the yellow TiO2-x was a preferable CO2 adsorption and conversion site.
Highlights
TiO2Àx/W18O49 with core–shell or double-shelled hollow microspheres were synthesized through a facile multi-step solvothermal method
The advanced architecture significantly enhanced the electronic properties of TiO2Àx/ W18O49, improving by more than 30 times the CO2 photoreduction efficiency compared to the pristine W18O49
Hong et al fabricated an Ag core with TiO2 shells (14.8 mmol gÀ1), which revealed a higher gas–solid CO2 photoreduction under a solar simulator when compared to the as-prepared TiO2 nanoparticles (3.9 mmol gÀ1) and Ag deposited on TiO2 (4.4 mmol gÀ1) after 3 h
Summary
The characteristic peaks of WO3 were observed in the TW12h sample (JCPDS card no.: 31035, discussed in paragraph).[15] Prolonging the solvothermal treatment time to 24 h resulted in a further decrease of the intensity of TiO2Àx as well as the WO3 peaks (Fig. S1A(d), ESI†). When the solvothermal time was extended to 24 h, the intensity of the anatase peak (141 cmÀ1) increased again (Fig. S1B(d), ESI†).
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