Hollow AgI:Ag Nanoframes as Solar Photocatalysts for Hydrogen Generation from Water Reduction

Abstract

A facile strategy based on the principle of the Kirkendall effect has been developed to synthesize hollow nanoframes and nanoshells of AgI:Ag composites through the controlled anion-exchange reaction between I(-) ions and solid AgBr:Ag (or AgCl:Ag) nanoparticles that serve as templates. Regardless of the morphologies of the template nanoparticles, they can be chemically transformed to hollow AgI:Ag structures with morphologies similar to those of the templates. The synthesized hollow AgI:Ag nanostructures can be used as efficient photocatalysts for H2 generation from water reduction and the decomposition of organic pollutants owing to the enhanced absorption of visible light by the Ag components in the hybrid nanostructures. The hollow nanostructures exhibit a higher photocatalytic performance than the corresponding solid nanoparticles possibly because of the large surface area and unique AgI/Ag interfaces associated with the hollow nanostructures.

In situ high-energy synchrotron X-ray diffraction revealing precipitation reaction kinetics of silver ions with mixed halide ions

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Among all kinds of silver halides, silver chlorobromide (AgCl x Br 1Àx , 0 o x o 1) nanoparticles represent a class of interesting materials that can offer many advantages in comparison with either AgCl or AgBr. For example, the refractive index of AgCl x Br 1Àx can be tuned by adjusting its chemical composition to make them the promising candidates in interesting applications.…”

Anion replacement in silver chlorobromide nanocubes: two distinct hollowing mechanisms

“…The Kirkendall hollowing process can be triggered by a broad range of reactions including redox reactions 28 and ion exchange reactions. 29 In a typical Kirkendall hollowing process, the initial reaction deposits a thin layer of the desired shell material on the surfaces of the solid sacrificial template nanoparticles, creating interfacial boundaries to facilitate the following Kirkendall hollowing process.…”

Biosynthesis and Characterization of Silver Nanoparticles (Snps) by using Leaf Extracts of Ocimum Sanctum L (Tulsi) and Study of its Antibacterial Activities

“…The use of SNPs have already been reported as anti-angiogenesis [31], anti-inflammatory [32], anti-platelet activity [33], anti-bactarial [34] and anti-viral [35]. The improvement of SNPs are rapidly increasing in different fields and it may use in food packaging, coating for bio-labeling, antimicrobial agent, solar energy and drug delivery [36][37][38].…”