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Nano Research

Article Title

Photocatalytic reduction of CO2 with H2O over modified TiO2 nanofibers: Understanding the reduction pathway

Keywords

TiO2, photocatalysis, CdSe quantum dots, CO2 photoreduction

Abstract

Nanosized metal (Pt or Pd)-decorated TiO2 nanofibers (NFs) were synthesizedby a wet impregnation method. CdSe quantum dots (QDs) were then anchoredonto the metal-decorated TiO2 NFs. The photocatalytic performance of thesecatalysts was tested for activation and reduction of CO2 under UV-B light. Gaschromatographic analysis indicated the formation of methanol, formic acid,and methyl formate as the primary products. In the absence of CdSe QDs,Pd-decorated TiO2 NFs were found to exhibit enhanced performance comparedto Pt-decorated TiO2 NFs for methanol production. However, in the presence ofCdSe, Pt-decorated TiO2 NFs exhibited higher selectivity for methanol, typicallyproducing ~90 ppmg−1·h−1 methanol. The CO2 photoreduction mechanism isproposed to take place via a hydrogenation pathway from first principlescalculations, which complement the experimental observations.

Graphical Abstract

Publisher

Tsinghua University Press

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