Dumbbell-like Pt–Fe₃O₄ Nanoparticles Encapsulated in N-Doped Carbon Hollow Nanospheres as a Novel Yolk@Shell Nanostructure toward High-Performance Nanocatalysis

Abstract

Noble metal−Fe 3 O 4 dumbbell-like nanoparticles have aroused considerable attention because of their high potential as heterogeneous nanocatalysts. The designed synthesis of the advanced architecture of noble metal−Fe 3 O 4 dumbbell-like nanoparticles with both improved catalytic activity and stability is still a challenge. Herein, through the combination of yolk@shell and dumbbell-like nanostructures, dumbbell-like Pt−Fe 3 O 4 nanoparticles encapsulated in N-doped carbon hollow nanospheres (Pt−Fe 3 O 4 @N-carbon) as a special yolk@ shell nanostructure were developed. In comparison with Pt−Fe 3 O 4 dumbbell-like nanoparticles, Pt−Fe 3 O 4 @N-carbon yolk@shell nanoparticles showed improved catalytic activity and stability toward the liquid-phase 4-nitrophenol reduction and β-ionone oxidation, making them a promising candidate for catalysis applications.

CoFe Nanoparticle-Decorated Reduced Graphene Oxide for the Highly Efficient Reduction of 4-Nitrophenol

“…Due to the highly toxic, carcinogenic, and teratogenic properties, 4-NP is well-known as one kind of the “priority pollutants” . Many kinds of catalysts have been developed for the catalytic degradation of 4-NP to 4AP, including Pd–Ni nanowires, Pt–Fe 3 O 4 , Pt–Cu bimetallic NPs, Au-Silica, Pd cubes, Au–SnO 2 , and so on. ,− Therefore, the catalytic properties of the CoFe/RGO nanocomposites were evaluated by the reduction of 4-NP to 4-AP. The reaction kinetic parameters were determined from the time-dependent spectra of the solution.…”

Metal/semiconductor interfaces in nanoscale objects: synthesis, emerging properties and applications of hybrid nanostructures

“…Silica is popular as a hard template that can be removed, as demonstrated in the formation of Pt–Fe 3 O 4 HNS encapsulated in N-doped carbon hollow spheres by embedding the dumbbell in silica and polydopamine, which after carbonization and silica removal resulted in a yolk–shell morphology. 270 Naya et al have used ZnO, which dissolves under mild conditions to form a ‘nanoegg’ shape, of half-cut Au(core)–CdS(shell). 271 …”

A Mini Review on Yolk-Shell Structured Nanocatalysts

“…Meanwhile, in terms of addressing catalyst limitations, there are other promising approaches such as the design of dual or multiple functional yolks. Our group synthesized the yolk-shell with dumbbell-like Pt-Fe 3 O 4 encapsulated in the N-doped carbon hollow nanospheres (Sun et al, 2019). With the investigation of the reduction of 4-nitrophenol and oxidation of β-ionone to the epoxide, the as-designed yolk-shell exhibits highly improved catalytic efficiency due to the presence of the heterojunction interface, which largely benefits electron transfer.…”