Production of NiO, NiO/Ag, NiO/Au, and NiO/Pt hollow spheres by using block copolymer stabilized microspheres as a template

Abstract

Hollow spheres of nickel oxide (NiO) and silver, gold, and platinum nanoparticle loaded NiO composites were successfully produced by using polystyrene (PS) latexes as hard template. Due to the presence of tertiary amine based diblock copolymer stabilizer on the surface of PS, the tertiary amine functional groups provided homogene deposition of nickel hydroxide, and then the precursor NiO salt production on the surface of PS latexes with a controlled precipitation technique. Then, NiO and NiO/metal NP hollow spheres were produced by calcination at 600 °C. Thermogravimetric analysis indicated that the amounts of NiO and NiO‐composite after calcination were in the range of 21.1–29.7 wt%. The diameters of metal oxide spheres were in the range of 2.0–2.7 μm and the shell thickness were in the range of 250–350 nm. These structures had very low densities due to their porous and hollow structures and had outer layers with highly rough surfaces due to formation of nanosheets, which may offer important advantages for catalysis studies.

Low-temperature pyrolysis enables FeNi3 nanoparticle implanted N-doped carbon nanosheets as an efficient bifunctional electrocatalyst for overall water splitting

“…S15b†), indicating partial surface oxidation of FeNi 3 /NCS. 67,68 Meanwhile, the partial surface oxidation of FeNi 3 /NCS during the OER stability test is also reflected by the O 1s spectrum, where the M–O intensity increased obviously (Fig. S15c†).…”

“…5d, the carbonized sample obtained at 350 °C (S-350) exhibits obvious peaks of the (021) plane of Fe 3 O 4 and (220) plane of NiO. 52,67 Distinguishable FeNi 3 NPs peaks with relatively weak Ni peaks are observed after pyrolysis at 400 °C. The FeNi 3 NP characteristic peaks are intensified at 450 °C.…”

Photonic Cooler Based on Multistacked Thin Films with Near-Infrared Filter Properties

“…Consequently, developing an IR filter has to also meet the query of vis light maximization. Initial research works have dealt with doped transparent conductive oxide as they are thermally and chemically stable; − however, their large-scale deployment was not successful due to the low IR cutoff percentage. − NiO/Ag, NiO/Au, NiO/Ni, and NiO/Pt stacked layers were then developed for UV light filtration and photocatalytic activity, but the functionality of IR filtration was not met and remained a persistent technological challenge. − We conducted both experimental and numerical validations to confirm the feasibility of creating a photonic cooling system for smart windows. This technology utilizes nanofilms made from cost-effective oxide materials integrated with metal layers.…”

Preparation of Cu2O/Au Composite Nanomaterials for Effective Reduction of 4‐Nitrophenol

“…), Cu 2 O with suitable band gap energy (2.0-2.2 eV) and more energetic conduction band (∼ À 1.0 eV) has shown a very effective function on the process of catalytic reduction of nitrobenzene. [22][23][24][25][26] Although all of these catalysts show accelerated reaction processes, the conversion of nitrobenzene to the corresponding aniline usually results in possible byproducts, and the p-aminophenol is the only product of Cu 2 O reduction of p-nitrophenol. Therefore, Cu 2 O is widely selected as the catalytic material.…”