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ZnO@CdS Core-Shell Heterostructures: Fabrication, Enhanced Photocatalytic, and Photoelectrochemical Performance.

Ding M, Yao N, Wang C, Huang J, Shao M, Zhang S, Li P, Deng X, Xu X - Nanoscale Res Lett (2016)

Bottom Line: ZnO nanorods and ZnO@CdS heterostructures have been fabricated on carbon fiber cloth substrates via hydrothermal and electrochemical deposition.The result illustrated that the photodegradation efficiency of ZnO@CdS heterostructures was better than that of pure ZnO nanorods, in which the rate constants were about 0.04629 and 0.02617 min(-1).Furthermore, the photocurrent of ZnO@CdS heterostructures achieved 10(2) times enhancement than pure ZnO nanorods, indicating that more free carriers could be generated and transferred in ZnO@CdS heterostructures, which could be responsible for the increased photocatalytic performance.

View Article: PubMed Central - PubMed

Affiliation: School of Physics and Technology, University of Jinan, 336 Nanxinzhuang West Road, Jinan, 250022, Shandong Province, People's Republic of China.

ABSTRACT
ZnO nanorods and ZnO@CdS heterostructures have been fabricated on carbon fiber cloth substrates via hydrothermal and electrochemical deposition. Their photocatalytic properties were investigated by measuring the degradation of methylene blue under ultraviolet light irradiation. The result illustrated that the photodegradation efficiency of ZnO@CdS heterostructures was better than that of pure ZnO nanorods, in which the rate constants were about 0.04629 and 0.02617 min(-1). Furthermore, the photocurrent of ZnO@CdS heterostructures achieved 10(2) times enhancement than pure ZnO nanorods, indicating that more free carriers could be generated and transferred in ZnO@CdS heterostructures, which could be responsible for the increased photocatalytic performance.

No MeSH data available.


The schematic profile exhibiting the energy band alignment between ZnO and CdS
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Fig7: The schematic profile exhibiting the energy band alignment between ZnO and CdS

Mentions: where C0 represents the initial concentration of MB and C refers to the concentrations at different irradiation time t, and k is the reaction rate constant. The linear transform of ln(C/C0) versus time t of MB photodegradation over ZnO and ZnO@CdS is shown in Fig. 6b. The rate constant (k) was evaluated by the slopes of linear fit for each photocatalytic reaction. The observed rate constant was about 0.04629 min−1 for ZnO@CdS heterojunction, which was obviously higher than 0.02617 min−1 for pure ZnO nanorods. Compared with the previous reports, the photodegradation rate is obviously improved. The experimental results indicated that the addition of CdS layer on ZnO nanorods could facilitate charge transfer thus significantly improving the photocatalytic activities. The mechanism for highly efficient carrier separation and transport at the interface of the ZnO@CdS heterostructure was proposed according to the result of photoelectrochemical test and photodegradation experimentation, which is similar with the previous reports [21, 26, 29, 30, 35]. Figure 7 displays the type-II band alignment of ZnO@CdS heterostructure and the mechanism of the photocatalytic reaction, which included the electron–hole pair generation by incident photons, separation and transport of photogenerated carriers, and reduction/oxidation reactions of the absorbed species. This band alignment was beneficial to fast separation and transport of photogenerated holes and electrons at the interface of the of ZnO@CdS heterostructure. Therefore, ZnO@CdS heterostructure exhibited superior photocatalytic performance purer than that of ZnO.Fig. 7


ZnO@CdS Core-Shell Heterostructures: Fabrication, Enhanced Photocatalytic, and Photoelectrochemical Performance.

Ding M, Yao N, Wang C, Huang J, Shao M, Zhang S, Li P, Deng X, Xu X - Nanoscale Res Lett (2016)

The schematic profile exhibiting the energy band alignment between ZnO and CdS
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835407&req=5

Fig7: The schematic profile exhibiting the energy band alignment between ZnO and CdS
Mentions: where C0 represents the initial concentration of MB and C refers to the concentrations at different irradiation time t, and k is the reaction rate constant. The linear transform of ln(C/C0) versus time t of MB photodegradation over ZnO and ZnO@CdS is shown in Fig. 6b. The rate constant (k) was evaluated by the slopes of linear fit for each photocatalytic reaction. The observed rate constant was about 0.04629 min−1 for ZnO@CdS heterojunction, which was obviously higher than 0.02617 min−1 for pure ZnO nanorods. Compared with the previous reports, the photodegradation rate is obviously improved. The experimental results indicated that the addition of CdS layer on ZnO nanorods could facilitate charge transfer thus significantly improving the photocatalytic activities. The mechanism for highly efficient carrier separation and transport at the interface of the ZnO@CdS heterostructure was proposed according to the result of photoelectrochemical test and photodegradation experimentation, which is similar with the previous reports [21, 26, 29, 30, 35]. Figure 7 displays the type-II band alignment of ZnO@CdS heterostructure and the mechanism of the photocatalytic reaction, which included the electron–hole pair generation by incident photons, separation and transport of photogenerated carriers, and reduction/oxidation reactions of the absorbed species. This band alignment was beneficial to fast separation and transport of photogenerated holes and electrons at the interface of the of ZnO@CdS heterostructure. Therefore, ZnO@CdS heterostructure exhibited superior photocatalytic performance purer than that of ZnO.Fig. 7

Bottom Line: ZnO nanorods and ZnO@CdS heterostructures have been fabricated on carbon fiber cloth substrates via hydrothermal and electrochemical deposition.The result illustrated that the photodegradation efficiency of ZnO@CdS heterostructures was better than that of pure ZnO nanorods, in which the rate constants were about 0.04629 and 0.02617 min(-1).Furthermore, the photocurrent of ZnO@CdS heterostructures achieved 10(2) times enhancement than pure ZnO nanorods, indicating that more free carriers could be generated and transferred in ZnO@CdS heterostructures, which could be responsible for the increased photocatalytic performance.

View Article: PubMed Central - PubMed

Affiliation: School of Physics and Technology, University of Jinan, 336 Nanxinzhuang West Road, Jinan, 250022, Shandong Province, People's Republic of China.

ABSTRACT
ZnO nanorods and ZnO@CdS heterostructures have been fabricated on carbon fiber cloth substrates via hydrothermal and electrochemical deposition. Their photocatalytic properties were investigated by measuring the degradation of methylene blue under ultraviolet light irradiation. The result illustrated that the photodegradation efficiency of ZnO@CdS heterostructures was better than that of pure ZnO nanorods, in which the rate constants were about 0.04629 and 0.02617 min(-1). Furthermore, the photocurrent of ZnO@CdS heterostructures achieved 10(2) times enhancement than pure ZnO nanorods, indicating that more free carriers could be generated and transferred in ZnO@CdS heterostructures, which could be responsible for the increased photocatalytic performance.

No MeSH data available.