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• W2583653397 abstract "Core–shell nanoparticles containing plasmonic metals (Ag or Au) have been frequently reported to enhance performance of photo-electrochemical (PEC) devices. However, the stability of these particles in water-splitting conditions is usually not addressed. In this study we demonstrate that [email protected]2 core–shell particles are instable in the acidic conditions in which WO3-based PEC cells typically operate, Ag in the core being prone to oxidation, even if the SiO2 shell has a thickness in the order of 10 nm. This is evident from in situ voltammetry studies of several anode composites. Similar to the results of the PEC experiments, the [email protected]2 core–shell particles are instable in slurry-based, Pt/ZnO induced photocatalytic water-splitting. This was evidenced by in situ photodeposition of Ag nanoparticles on the Pt-loaded ZnO catalyst, observed in TEM micrographs obtained after reaction. We explain the instability of [email protected]2 by OH-radical induced oxidation of Ag, yielding dissolved Ag+. Our results imply that a decrease in shell permeability for OH-radicals is necessary to obtain stable, Ag-based plasmonic entities in photo-electro-chemical and photocatalytic water splitting." @default.
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• W2583653397 date "2017-03-01" @default.
• W2583653397 modified "2023-09-24" @default.
• W2583653397 title "Stability of Ag@SiO 2 core–shell particles in conditions of photocatalytic overall water-splitting" @default.
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• W2583653397 doi "https://doi.org/10.1016/j.jechem.2016.12.010" @default.
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