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Synthesis And Catalytic Application Of High Quality AgInS2 And Carbon-Supported Alloyed AuPt Nanocrystals

Posted on:2013-11-16Degree:MasterType:Thesis
Country:ChinaCandidate:Z S LuoFull Text:PDF
GTID:2231330371469031Subject:Applied Chemistry
Abstract/Summary:PDF Full Text Request
In this thesis.the highly luminescent water-soluble AgInS2 nanocrystals (AIS NCs) were synthesized in aqueous phase through a simple and friendly method for the first time, in which acetate salts of silver and indium, and sodium sulfide were used as Ag, In, S precursors and glutathione (GSH) as capping/stabilizing agents, respectively. Various experimental conditions including pH value, the mole ratio of GSH/In, In/Ag, and In/S have been systematically investigated in the effects on the optical properties of the as-prepared NCs. While the ratios of In/Ag and In/S could tunable the emission wavelength from 560 to 660 nm. After modifying with ZnS, the obtained ZnS-AgInS2 (ZAIS) NCs show both stronger PL emission and higher quantum yield increasing to 5 fold. Furthermore, the obtained AIS and ZAIS NCs also show photocatalytic activities in the degradation of organic pollutant.Furthermore, carbon-supported Pt and bimetallic AuPt alloy electrocatalysts have successfully prepared via a facile in-situ chemical co-reduction method, in which HAuCl4 and H2PtCl6 as precursors and polyvinylpyrrolidone (PVP) as ligand, sodium borohydride (NaHB4) as reducing agent, respectively. Various experimental conditions including the amount of precursors, reaction temperature and reaction time have been systematically investigated in the crystal structure and the effects on the electrocatalystic properties of the as-prepared electrocatalysts. By means of UV-vis spectra, X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive X-ray spectrum (EDS) and electrochemical workstation, the crystal structure, particle size and electrocatalytic properties of these nanoparticles have been studied. Compared with Pt/C nanoparticles, AuPt/C showed remarikably high activites towards formic acid oxidation.
Keywords/Search Tags:Aqueous synthesis, Ternary structured nanocrystals, Nanoeletrocatalysts, Formic acid oxidation
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