Journal
NANO RESEARCH
Volume 9, Issue 7, Pages 1956-1968Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-016-1087-9
Keywords
TiO2; photocatalysis; CdSe quantum dots; CO2 photoreduction
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Funding
- Kempe Foundations
- Bio4Enenrgy programme
- Artificial Leaf project under Knut & Alice Wallenberg Foundation
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Nanosized metal (Pt or Pd)-decorated TiO2 nanofibers (NFs) were synthesized by a wet impregnation method. CdSe quantum dots (QDs) were then anchored onto the metal-decorated TiO2 NFs. The photocatalytic performance of these catalysts was tested for activation and reduction of CO2 under UV-B light. Gas chromatographic 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 compared to Pt-decorated TiO2 NFs for methanol production. However, in the presence of CdSe, Pt-decorated TiO2 NFs exhibited higher selectivity for methanol, typically producing similar to 90 ppmg(-1).h(-1) methanol. The CO2 photoreduction mechanism is proposed to take place via a hydrogenation pathway from first principles calculations, which complement the experimental observations.
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