Facile Decoration of Au Nanoparticles on CdS Nanorods by Polyoxometalate with Enhanced Photocatalytic Activities Toward Hydrogen Evolution

Abstract

The tri-component hybrid CdS nanorods (NRs)/Au nanoparticles (NPs)@polyoxometalate (POM) was successfully prepared by a facile, efficient and green method. The structural properties and component analysis were studied by Transmission electron microscopy (TEM), X-ray Diffraction (XRD) and UV-Vis spectra. The POMs sever as not only reductant and bridge molecules, but also as co-catalyst to play an important role in the photocatalytic process. The as-prepared nanohybrid shows obviously enhanced photocatalytic activity toward photocatalytic evolution of hydrogen.

Recent Advances in Hybrid Materials of Metal Nanoparticles and Polyoxometalates

“…In these cases, the POMs act as multielectron transfer mediators for charge separation between the metal nanoparticles and the supporting materials to increase the photocatalytic efficiency. [23,24] In addition, the immobiliza- Angewandte Chemie Minireviews tion of metal nanoparticles on other supporting materials, such as metal-organic frameworks (MOFs), microporous carbon (MPC), and ordered mesoporous carbon (OMC), has enabled the development of visible-light-driven H 2 evolution, the sensitive detection of chlorogenic acid, and the enhancement of photocurrent, respectively. [25][26][27] Whereas, POMs are well-known for their efficacy in various photocatalytic processes, more in-depth studies are expected to use these photocatalytic properties beyond the simple multielectron transfer ability of POMs in hybrid systems.…”

Adsorption of Keggin-Type Polyoxometalates on Rh Metal Particles under Reductive Conditions

“…Typical examples use POM as both a stabilizer and reducing agent during the preparation of metal particles. , The reaction of the reduced form of POM with a precursor complex of noble metal gives noble metal particles as a colloid. The use of an external reducing agent is also a common approach. , Anyway, the POM after preparation of noble metal particles has been considered to decorate the surface of the particle, and the electrocatalytic ,− and photocatalytic , behaviors of the decorated particles have been investigated by several research groups. However, the structure of POM after preparation or during electro/photocatalysis has not been investigated well because of the difficulty in the characterization of adsorbed POM.…”

“…The use of an external reducing agent is also a common approach. 31,32 Anyway, the POM after preparation of noble metal particles has been considered to decorate the surface of the particle, and the electrocatalytic 31,33−36 and photocatalytic 37,38 behaviors of the decorated particles have been investigated by several research groups. However, the structure of POM after preparation or during electro/photocatalysis has not been investigated well because of the difficulty in the characterization of adsorbed POM.…”

Novel-CdS-nanorod with stacking fault structures: Preparation and properties of visible-light-driven photocatalytic hydrogen production from water

“…CdS nanorods, as a kind of structure for the series of CdS photocatalysts with specific nanostructures, attracted more attention of researchers [17,18]. The CdS nanorods could been modified by many catalysts, such as Ag 2 S, NiS, Co(OH) 4 , Au, ZnFe 2 O 4 , Co 3 O 4 and so on, which promoted effectively the separation of photo-induced electrons and holes, so the activity of photocatalytic H 2 production for CdS nanorods was enhanced [19][20][21][22][23][24][25][26][27][28][29]. Liu et al [30,31] subsequently synthesized a kind of twin-containing CdZnS particles with alternating zinc-blende (ZB) and wurtzite (WZ) segments along the h1 1 1i direction.…”