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- 저자 : GUOXIANG TANG (검색결과 3 건)
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Peisong Tang,Yi Tong,Haifeng Chen,Feng Cao,Guoxiang Pan 한국물리학회 2013 Current Applied Physics Vol.13 No.2
Single phase perovskite LaFeO3 nanoparticles are directly synthesized by a one-step microwave-assisted route without additional high temperature calcination process. The prepared sample is characterized by X-ray diffraction (XRD), field emission scanning microscope (FE-SEM), BrunauereEmmetteTeller (BET) specific surface area measurement, diffuse reflectance spectroscopy (DRS) and Fourier transform infrared spectroscopy (FTIR). XRD and SEM show that the prepared LaFeO3 is single phase perovskite and spherelike shape. The DRS result shows that the prepared LaFeO3 has strong visible-light absorption and an optical absorption onset of 525 nm, corresponding to an optical band gap of 2.36 eV. The photocatalytic experiment demonstrates that LaFeO3 is highly visible-light photocatalytic active for the degradation of methylene blue. It is suggested that the narrow band gap and the strong visible-light absorption are responsible for the high visible-light photocatalytic activity of the prepared LaFeO3
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Metallic Hydrogen in Atomically Precise Gold Nanoclusters
Hu, Guoxiang,Tang, Qing,Lee, Dongil,Wu, Zili,Jiang, De-en American Chemical Society 2017 Chemistry of materials Vol.29 No.11
<P>Hydrogen-metal interaction is the foundation of many technologies and processes, but how hydrogen behaves in atomically precise gold nanoclusters remains unknown even though they have been used in hydrogenation catalysis and water splitting. Herein, we investigate how hydrogen interacts with [Au-25(SR)(18)](q) dusters and mono-atom-doped bimetallic [M1Au24(SR)(18)](q) clusters (M = Pt, Pd, Ag, Cu, Hg, or Cd) from first principles. We find that hydrogen behaves as a metal in these clusters and contributes its is electron to the superatomic free-electron count. This opposite behavior compared to that of the hydride in Cu and Ag dusters allows the small hydrogen to interstitially dope the gold dusters and tune their superatomic electronic structure. The doping energetics shows that when an eight-electron superatom is formed after H doping, the binding energy of H is much stronger, while binding of H with an already eight-electron superatom is much weaker. Indeed, frontier orbitals and the HOMO-LUMO gaps of [Au25H1(SR)(18)](0), [Au25H2(SR)(18)](+) [PtAu24H2(SR)(18)](0), [PdAu24H2(SR)(18)](0), [AgAu24H(SR)(18)](0), and [CuAu24H(SR)(18)](0) all have very similar features, because they are all eight-electron superatoms. By calculating the Gibbs free energies of hydrogen adsorption, we predict that PtAu24(SR)(18), PdAu24(SR)(18), and center-doped CuAu24(SR)(18) can be good electrocatalysts for the hydrogen evolution reaction.</P>
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