Core–shell Au@AuAg nano-peanuts for the catalytic reduction of 4-nitrophenol: critical role of hollow interior and broken shell structure

Abstract

Bimetallic hollow core-shell nanoparticles have gained immense attention especially, as a high-performance catalyst due to their large surface area and increased number of uncoordinated atoms. But, the synthesis of anisotropic...

Porous Plasmonic Au–Ag@Au Nanostructures for Photoelectrochemical Methanol Oxidation

“…The overall peanut shape indicates a preferential growth from the corner {111} facets of the nanorods, as seen from the increase in dimension of the corner facets. On the other hand, the {100} facets present in the side and tip remain preserved . The blue shift of the LSPR wavelengths of the Au-PNS structure is consistent with an overall decrease of the aspect ratio from 3.15 (for AuNR) to 2.23 (for Au-PNS).…”

“…On the other hand, the {100} facets present in the side and tip remain preserved. 15 The blue shift of the LSPR wavelengths of the Au-PNS structure is consistent with an overall decrease of the aspect ratio from 3.15 (for AuNR) to 2.23 (for Au-PNS). Typically, the TSPR of gold nanorods is observed between 500 and 530 nm.…”

“…Pt and Ru are the most commonly used catalysts for MOR owing to their high efficiencies. − But the high cost, low abundance in the earth’s crust, and instability from the poisoning of intermediates severely restrict the scalability of Pt catalysts. , The major problem is the poisoning of the catalyst, which predominantly inhibits the efficiency because of the adsorption of the residual carbonaceous species formed during methanol oxidation . Various alloys of Pt with several low-cost materials have been used to overcome this shortcoming and have shown improved stability toward poisoning during the MOR process. ,, The surface structure and the elemental composition of these metals have a tremendous effect on the electrocatalytic performance. − For example, an alloy of Pt–Ru has been shown to improve methanol’s electrocatalytic activity by dissociative CO* oxidation with OH – ions. , A particularly interesting approach has been to create porous or hollow core–shell structures, where molecules have access not only to a larger active surface area but also to the high-index planes with low coordinated atoms. Various such structures involving Pt/Pd and other materials have been synthesized and found to be highly active catalysts for site-specific chemical reactions .…”

Yolk–shell type carbon–silica nanoarchitecture with dispersed and stabilized Ru nanoparticles for enhanced hydrogenation of aromatic compounds

“…The yolk–shell structures not only exhibit a substantial surface area, but also possess porosity that enables the entrapment of reactant molecules within their cavities, thereby augmenting the rate of the catalytic reaction. 30 It has been demonstrated that the catalytic reaction occurs within the confines of the hollow nanoparticles (NPs), resulting in an increased reaction rate inside the cavity. 31 In addition, compared with the hollow-structure, the movable core of yolk–shell structures can prevent the active metal within the cavity from migrating and agglomerating.…”

Synthesis of Different Nano‐layer Shells (Mono‐, Bi‐, and Alloy Layers)‐Coated Gold Spherical Nanoparticles Core for Catalysis

“…It is interesting that the catalytic activity of the Au core NPs is influenced by not only the Ag shell but also the same Au shell. The optical and catalytic studies of monolayer shell on Au core (Au@Ag), alloy shell on Au core (Au@AgAu), and multi‐shells on Au core (Au@Ag@Au@Ag) have also been reported [23–27] . However, systematic and detailed analysis of the optical and catalytic properties of various shell layers (such as monolayer shell (MLS), bilayer shell (BLS), and alloy layer shell (AS) on core NPs) are not reported.…”