Limits...
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.


Morphological characterization of flower-like CdS.TEM images of pure CdS (a) and flower-like CdS (b); the HRTEM image of a single petal flower-like CdS (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4559807&req=5

f3: Morphological characterization of flower-like CdS.TEM images of pure CdS (a) and flower-like CdS (b); the HRTEM image of a single petal flower-like CdS (c).

Mentions: Figure 3(a–b) shows the typical TEM images of the reference CdS and flower-like CdS. It can be found that the pure CdS has the irregularity of dendritic architecture. However, TEM image (Fig. 3b) displays that L-Histidine-assisted method for synthesis of CdS does generate flower-like structure and CdS nanorods exist in the flower-like structure. In addition, two main distinct lattice fringes are clearly distinguished in the HRTEM image (Fig. 3c). The spacing of 0.34 nm can be ascribed to the (111) and (002) crystal faces of cubic phase CdS and hexagonal phase CdS, and the spacing of 0.36 nm matches well with the (100) crystal face of hexagonal phase CdS, respectively, according to the XRD of cubic and hexagonal phases 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)

Morphological characterization of flower-like CdS.TEM images of pure CdS (a) and flower-like CdS (b); the HRTEM image of a single petal flower-like CdS (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Morphological characterization of flower-like CdS.TEM images of pure CdS (a) and flower-like CdS (b); the HRTEM image of a single petal flower-like CdS (c).
Mentions: Figure 3(a–b) shows the typical TEM images of the reference CdS and flower-like CdS. It can be found that the pure CdS has the irregularity of dendritic architecture. However, TEM image (Fig. 3b) displays that L-Histidine-assisted method for synthesis of CdS does generate flower-like structure and CdS nanorods exist in the flower-like structure. In addition, two main distinct lattice fringes are clearly distinguished in the HRTEM image (Fig. 3c). The spacing of 0.34 nm can be ascribed to the (111) and (002) crystal faces of cubic phase CdS and hexagonal phase CdS, and the spacing of 0.36 nm matches well with the (100) crystal face of hexagonal phase CdS, respectively, according to the XRD of cubic and hexagonal phases 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.