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Electrochemical synthesis of core-shell nanoparticles by seed-mediated selective deposition.

ABSTRACT: Conventional solvothermal synthesis of core-shell nanoparticles results in them being covered with surfactant molecules for size control and stabilization, undermining their practicality as electrocatalysts. Here, we report an electrochemical method for the synthesis of core-shell nanoparticles directly on electrodes, free of surfactants. By implementation of selective electrodeposition on gold cores, 1^st-row transition metal shells were constructed with facile and precise thickness control. This type of metal-on-metal core-shell synthesis by purely electrochemical means is the first of its kind. The applicability of the nanoparticle decorated electrodes was demonstrated by alkaline oxygen evolution catalysis, during which the Au-Ni example displayed stable catalysis with low overpotential.

SUBMITTER: Park JH

PROVIDER: S-EPMC8528034 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature

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Electrochemical synthesis of core-shell nanoparticles by seed-mediated selective deposition.

Park Joon Ho JH Jin Seon-Mi SM Lee Eunji E Ahn Hyun S HS

Chemical science 20210908 40

Conventional solvothermal synthesis of core-shell nanoparticles results in them being covered with surfactant molecules for size control and stabilization, undermining their practicality as electrocatalysts. Here, we report an electrochemical method for the synthesis of core-shell nanoparticles directly on electrodes, free of surfactants. By implementation of selective electrodeposition on gold cores, 1<sup>st</sup>-row transition metal shells were constructed with facile and precise thickness c ...[more]

PMID: 34777775

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Project description:Diabetes is a chronic metabolic disease which leads to high glucose levels in the blood, with severe consequences for human health. Due to the worldwide appeal for the reduction in calorie intake, this study presents the development of a nanomaterial able to capture sucrose selectively, thus providing a tool to remove naturally occurring sucrose from food, such as fruit juices, producing low-calorie juices for consumption. Magnetite nanoparticles (Fe3O4 NPs) coated with an inert material (SiO2) and functionalised with the enzyme invertase were designed to remove sucrose from solutions. Fe3O4 NPs were synthesised using the co-precipitation method, whereas the coating with a silica shell was done by the Stöber method. Its physicochemical characteristics were determined, with excellent stability over time. On the other hand, the invertase enzyme was extracted from dry Baker's yeast, purified and immobilised on the surface of the silica-coated Fe3O4 NPs. pH-triggered sucrose capture occurred at pH 3.0 once invertase with protonated catalytic residues was able just to bind with sucrose in a highly selective way. After a short, 1 min interaction, approximately 13.5 mmol L-1 of sucrose was captured per gram of nanomaterial and removed with the use of an external permanent magnet. The complex sucrose/nanomaterial was washed, and the released sucrose was put into buffered solution (pH = 4.8), where it underwent hydrolysis to yield inverted sugar. On the other side, sucrose-free nanomaterial was reused with no loss of enzymatic capability to capture sucrose at pH = 3.0 and maintained the invertase activity at pH 4.8 in ten consecutive rounds of re-use. As sucrose was recovered in the form of inverted sugar, not just low sugar beverage could be obtained, but also a high valued market product. Thus, the developed technology allows for the commercialisation of low-calorie food, offering healthier options to consumers and helping to fight diabetes and obesity.

Dataset Information

Electrochemical synthesis of core-shell nanoparticles by seed-mediated selective deposition.

Publications

Electrochemical synthesis of core-shell nanoparticles by seed-mediated selective deposition.

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