The energy crisis and greenhouse effect due to the increasing amospheric concentration of carbon dioxide (CO2) are recognized to be the two major problems for us in recent years. The solar photocatalytic conversion of CO2 and H2O to renewable hydrocarbon fuels, which would help to reduce atmospheric CO2 level and partly fulfill energy demands, can be realized by using active photocatalysts. Among the photocatalysts, titanium dioxide (TiO2), which is cheap, nontoxic, abundant and resistant to photocorrosion, has been most widely used in the field of photocatalysis research. Three-dimensionally ordered macroporous (3DOM) materials with big pore size have a diffuse light effect, and the noble metal co-catalyst may facilitate the separation of photogenerated electrons and holes. In this study, a series of photocatalysts of 3DOM TiO2-supported core-shell structural Pt@CdS nanoparticles were facilely synthesized by the gas bubbling-assisted membrane reduction-precipitation (GBMR/P) method. All the catalysts possess well-defined 3DOM structure and the Pt@CdS core-shell nanoparticles are well dispersed on the inner wall of uniform macropore. 3DOM structure can enhance the light-harvesting efficiency and the all-solid-state Z-scheme system with CdS(shell)-Pt(core)-TiO2(support) nanojunction is favourable for the separation of photogenerated electrons and holes. Among the as-prepared catalysts, 3DOM Pt@CdS/TiO2-1 catalyst with the moderate thickness of CdS nanolayer shell shows the highest photocatalytic activity for CO2 reduction, which the formation rate of CH4 is 36.8 μmol g-1 h-1.

3D-ordered, macroporous TiO2-supported Pt@CdS core-shell nanoparticles for efficient, photocatalytic CO2 conversion

251st National Meeting (2016)

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