کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1272375 | 1497481 | 2014 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Cobalt sulfide quantum dots modified TiO2 nanoparticles for efficient photocatalytic hydrogen evolution Cobalt sulfide quantum dots modified TiO2 nanoparticles for efficient photocatalytic hydrogen evolution](/preview/png/1272375.png)
• CoSx/TiO2 heterojunction photocatalysts are synthesized.
• The CoSx/TiO2 shows remarkable UV and visible light photocatalytic activity.
• The hydrogen evolution rate was greatly improved.
• The intimate contact of the phases promotes the charge transfer and separation.
Cobalt sulfide quantum dots (CoSx QDs) modified TiO2 nanoparticles are prepared with a precipitation-deposition method using TiO2, cobalt acetate and sodium sulfide as the precursors. CoSx QD acts as an effective cocatalyst, which accelerates the transfer of the photo-generated electrons and serves as the active site for the reaction between electrons and H2O, thus enhancing the separation of the e−/h+ pairs and the photocatalytic H2 production activity of TiO2. The amount of CoSx exhibits an optimum value at about 5% (mole ratio to TiO2), at which the H2 production rate achieves 838 μmol h−1 g−1 using ethanol as the sacrificial reagent. This exceeds that of the pure TiO2 by more than 35 times.
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Journal: International Journal of Hydrogen Energy - Volume 39, Issue 28, 23 September 2014, Pages 15387–15393