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Ultrafast Spectroscopic Studies On Materials For Solar Energy Conversion Ultrafast Spectroscopic Studies On Materials For Solar Energy Conversion
Electrochemical Engineering of Hollow Fiber electrodes Electrochemical Engineering of Hollow Fiber electrodes
Electrochemical Compression Electrochemical Compression
Pulsed electrochemical synthesis Pulsed electrochemical synthesis
Characterization of electrochemistry by IR spectroscopy Characterization of electrochemistry by IR spectroscopy
Understanding dynamics of Gas bubble formation Understanding dynamics of Gas bubble formation
Hot photocatalysis Hot photocatalysis
Fundamental heterogeneous photocatalysis Fundamental heterogeneous photocatalysis
Silver Nanocubes Coated in Ceria: Core/Shell Size Effects on Light-Induced Charge Transfer ABSTRACT: Plasmonic sensitization of semiconductors is an attractive approach to increase light-induced photocatalytic performance; one method is to use plasmonic nanostructures in core@shell geometry. The occurrence and mechanism of synergetic effects in photocatalysis of such geometries are under intense debate and proposed to occur either through light-induced charge transfer (CT) or through thermal effects. This study focuses on the relation between the dimensions of Ag@CeO2 nanocubes, the wavelength-dependent efficiency, and the mechanism of light-induced direct CT. A 4mercaptobenzoic acid (4-MBA) linker between core and shell acts as a Raman probe for CT. For all Ag@CeO2 nanocubes, CT increases with decreasing excitation wavelength, with notable increase at and below 514 nm. This is fully explainable by CT from silver to the 4-MBA LUMO, with the increase for excitation wavelengths that exceed the Ag/4-MBA LUMO gap of 2.28 eV (543 nm). A second general trend observed is an increase in CT yield with ceria shell thickness, which is assigned to relaxation of the excited electron further into the ceria conduction band, potentially producing defects. KEYWORDS: plasmonic, sensitized photocatalyst, ceria, silver nanocube, Raman spectroscopy, FDTD, light-induced charge transfer
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