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Highly Efficient Photocatalytic Hydrogen Production of Flower-like Cadmium Sulfide Decorated by Histidine.

Wang Q, Lian J, Li J, Wang R, Huang H, Su B, Lei Z - Sci Rep (2015)

Bottom Line: Superior photocatalytic activity relative to that of pure CdS is observed on the flower-like CdS photocatalyst under visible light irradiation, which is nearly 13 times of pure CdS.On the basis of the results from SEM studies and our analysis, a growth mechanism of flower-like CdS is proposed by capturing the shape evolution.The imidazole ring of L-Histidine captures the Cd ions from the solution, and prevents the growth of the CdS nanoparticles.

View Article: PubMed Central - PubMed

Affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Gansu Polymer Materials, Lanzhou 730070, China.

ABSTRACT
Morphology-controlled synthesis of CdS can significantly enhance the efficiency of its photocatalytic hydrogen production. In this study, a novel three-dimensional (3D) flower-like CdS is synthesized via a facile template-free hydrothermal process using Cd(NO3)2•4H2O and thiourea as precursors and L-Histidine as a chelating agent. The morphology, crystal phase, and photoelectrochemical performance of the flower-like CdS and pure CdS nanocrystals are carefully investigated via various characterizations. Superior photocatalytic activity relative to that of pure CdS is observed on the flower-like CdS photocatalyst under visible light irradiation, which is nearly 13 times of pure CdS. On the basis of the results from SEM studies and our analysis, a growth mechanism of flower-like CdS is proposed by capturing the shape evolution. The imidazole ring of L-Histidine captures the Cd ions from the solution, and prevents the growth of the CdS nanoparticles. Furthermore, the photocatalytic contrast experiments illustrate that the as-synthesized flower-like CdS with L-Histidine is more stable than CdS without L-Histidine in the hydrogen generation.

No MeSH data available.


XRD patterns of CdS prepared without L-Histidine (a) and with L-Histidine (b) (H: hexagonal phases and C: cubic phases).
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f1: XRD patterns of CdS prepared without L-Histidine (a) and with L-Histidine (b) (H: hexagonal phases and C: cubic phases).

Mentions: XRD analysis is used to investigate the phase structure and crystalline size of the products. Figure 1 presents a comparison of XRD patterns of the as-prepared CdS samples without L-Histidine and with L-Histidine. The positions of the diffraction peaks of samples match well with the theoretical values of the hexagonal structure of CdS (JCPDS No: 41–1049) with the lattice parameters α = 4.140 Å. In addition, cubic structure of CdS typically has a characteristic peak at 30.6° corresponding to the (200) plane with the cell constant α = 5.818 Å (JCPDS No: 10–0454). It clearly indicates that cubic and hexagonal phases coexist in samples.


Highly Efficient Photocatalytic Hydrogen Production of Flower-like Cadmium Sulfide Decorated by Histidine.

Wang Q, Lian J, Li J, Wang R, Huang H, Su B, Lei Z - Sci Rep (2015)

XRD patterns of CdS prepared without L-Histidine (a) and with L-Histidine (b) (H: hexagonal phases and C: cubic phases).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4559807&req=5

f1: XRD patterns of CdS prepared without L-Histidine (a) and with L-Histidine (b) (H: hexagonal phases and C: cubic phases).
Mentions: XRD analysis is used to investigate the phase structure and crystalline size of the products. Figure 1 presents a comparison of XRD patterns of the as-prepared CdS samples without L-Histidine and with L-Histidine. The positions of the diffraction peaks of samples match well with the theoretical values of the hexagonal structure of CdS (JCPDS No: 41–1049) with the lattice parameters α = 4.140 Å. In addition, cubic structure of CdS typically has a characteristic peak at 30.6° corresponding to the (200) plane with the cell constant α = 5.818 Å (JCPDS No: 10–0454). It clearly indicates that cubic and hexagonal phases coexist in samples.

Bottom Line: Superior photocatalytic activity relative to that of pure CdS is observed on the flower-like CdS photocatalyst under visible light irradiation, which is nearly 13 times of pure CdS.On the basis of the results from SEM studies and our analysis, a growth mechanism of flower-like CdS is proposed by capturing the shape evolution.The imidazole ring of L-Histidine captures the Cd ions from the solution, and prevents the growth of the CdS nanoparticles.

View Article: PubMed Central - PubMed

Affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Gansu Polymer Materials, Lanzhou 730070, China.

ABSTRACT
Morphology-controlled synthesis of CdS can significantly enhance the efficiency of its photocatalytic hydrogen production. In this study, a novel three-dimensional (3D) flower-like CdS is synthesized via a facile template-free hydrothermal process using Cd(NO3)2•4H2O and thiourea as precursors and L-Histidine as a chelating agent. The morphology, crystal phase, and photoelectrochemical performance of the flower-like CdS and pure CdS nanocrystals are carefully investigated via various characterizations. Superior photocatalytic activity relative to that of pure CdS is observed on the flower-like CdS photocatalyst under visible light irradiation, which is nearly 13 times of pure CdS. On the basis of the results from SEM studies and our analysis, a growth mechanism of flower-like CdS is proposed by capturing the shape evolution. The imidazole ring of L-Histidine captures the Cd ions from the solution, and prevents the growth of the CdS nanoparticles. Furthermore, the photocatalytic contrast experiments illustrate that the as-synthesized flower-like CdS with L-Histidine is more stable than CdS without L-Histidine in the hydrogen generation.

No MeSH data available.