A seed-engineering approach toward a hollow nanoreactor suitable for the confined synthesis of less-noble Ni-based nanocrystals

Abstract

A hollow nanoreactor suitable for the cultivation of Ni-nanocrystals was developed through a distinct seed-engineering stratagem, which involved the assembly of a catalytically active Au/Pd-heterojunction-nanocrystal inside the hollow silica nanoshell. The resulting hollow nanoreactor demonstrated a targeted performance in the cavity-confined growth of the catalytic Ni nanocrystal.

Fabrication of Supported AuPt Alloy Nanocrystals with Enhanced Electrocatalytic Activity for Formic Acid Oxidation through Conversion Chemistry of Layer‐Deposited Pt2+ on Au Nanocrystals

“…For this purpose, we attempted to incorporate Fe 3 O 4 nanoparticles with the Au/Pt 2+ nanocrystal in the SiO 2 nanosphere by adding oleic acid–stabilized Fe 3 O 4 nanocrystals into the microemulsion suspension used to prepare (Au/Pt 2+ )@SiO 2 nanospheres . Analyses of the resultant solids revealed the formation of a core@shell [(Au/Pt 2+ )/Fe 3 O 4 ]@SiO 2 nanosphere in which a hybrid core, comprising a 6.2 (±0.5) nm Fe 3 O 4 nanocrystal with multiple surrounding Au/Pt 2+ nanocrystals with an average size of 1.6 (±0.3) nm, is encapsulated by an SiO 2 nanoshell ( Figure a) . When the [(Au/Pt 2+ )/Fe 3 O 4 ]@SiO 2 nanosphere was annealed in air at 500 °C, the Au/Pt 2+ nanocrystals were reduced to alloys as well as sintered together on the Fe 3 O 4 surface, and thus transformed into a single AuPt nanocrystal with a diameter of 3.1 (±0.3) nm (Figure b).…”

Multishelled NiO Hollow Microspheres for High-performance Supercapacitors with Ultrahigh Energy Density and Robust Cycle Life

“…S7g ) confirm that pure Ni hollow spheres were obtained from the NiO precursors. Hydrolytic dehydrogenation of ammonia borane (AB) for hydrogen generation was carried out to examine the catalytic performances of the catalysts 36 37 . The samples of 2S-Ni-HMS and 2S-Ni-HMS-CDS were selected respectively to test the H 2 generation ability, and to compare the diffusion resistance of ions through the single and closed double Ni shells.…”

Advanced yolk-shell nanoparticles as nanoreactors for energy conversion

“…Recently, this synthetic route has been successfully used to fabricate noble metal YSNs such as Ag@h-SiO2 YSNs [63], and the research focus has moved to synthesizing non-noble metal cores encapsulated in porous silica shells, e.g. Ni@SiO2 YSNs [64]. Ni, which is one of the most effective catalysts, gives good catalytic performances in many significant reactions.…”

“…As shown in Fig. 3, Pd was used as an effective catalyst for decomposition of Ni 2+ -hydrazine complex [64]. Pd 2+ ions were introduced onto Fe3O4 together with Au to form a stronger seed.…”