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Li P.,National Laboratory of Solid State Microstructures | Li P.,Eco Materials and Renewable Energy Research Center | Zhou Y.,Institute of Acoustics | Zhou Y.,National Laboratory of Solid State Microstructures | And 10 more authors.
Journal of the American Chemical Society | Year: 2015

An unprecedented, crystal facet-based CeO2 homojunction consisting of hexahedron prism-anchored octahedron with exposed prism surface of {100} facets and octahedron surface of {111} facets was fabricated through solution-based crystallographic-oriented epitaxial growth. The photocatalysis experiment reveals that growth of the prism arm on octahedron allows to activate inert CeO2 octahedron for an increase in phototocatalytic reduction of CO2 into methane. The pronounced photocatalytic performance is attributed to a synergistic effect of the following three factors: (1) band alignment of the {100} and {111} drives electrons and holes to octahedron and prism surfaces, respectively, aiming to reach the most stable energy configuration and leading to a spatial charge separation for long duration; (2) crystallographic-oriented epitaxial growth of the CeO2 hexahedron prism arm on the octahedron verified by the interfacial lattice fringe provides convenient and fast channels for the photogenerated carrier transportation between two units of homojuntion; (3) different effective mass of electrons and holes on {100} and {111} faces leads to high charge carrier mobility, more facilitating the charge separation. The proposed facet-based homojunction in this work may provide a new concept for the efficient separation and fast transfer of photoinduced charge carriers and enhancement of the photocatalytic performance. © 2015 American Chemical Society.

Liu Q.,Eco Materials and Renewable Energy Research Center | Liu Q.,Nanjing University | Liu Q.,Anhui Polytechnic University | Zhou Y.,Eco Materials and Renewable Energy Research Center | And 4 more authors.
RSC Advances | Year: 2012

A novel, highly crystalline indium germinate hybrid sub-nanowire, which we denote as In 2Ge 2O 7(En) (En = ethylenediamine), with general diameters of 2-3 nm and lengths up to hundreds of nanometres was synthesized using a solvothermal route in a binary En/water solvent system. The hybrid ultrathin nanowire exhibits an ultraviolet photoluminescence emission, a dramatic blue shift by more than 100 nm relative to pure inorganic In 2Ge 2O 7 nanowire and microtubes. The In 2Ge 2O 7(En) ultrathin nanowire performs selectively the photocatalytic reduction of carbon dioxide (CO 2) into carbon monoxide (CO) in the presence of water vapor. With reference to our Zn 2GeO 4 nanoribbon photocatalyst, which was recently used to produce CH 4 under the same photocatalytic conditions, this work is a significant sign that the greenhouse gas, CO 2, can be ameliorated into desirable kinds of renewable fuels using different germanate catalysts. © 2012 The Royal Society of Chemistry.

Yan S.C.,Eco Materials and Renewable Energy Research Center | Li Z.S.,Eco Materials and Renewable Energy Research Center | Li Z.S.,Nanjing University | Zou Z.G.,Eco Materials and Renewable Energy Research Center | Zou Z.G.,Nanjing University
Langmuir | Year: 2010

Graphitic carbon nitride (g-C3N4) and boron-doped g-C3N4 were prepared by heating melamine and the mixture of melamine and boron oxide, respectively. X-ray diffraction, X-ray photoelectron spectroscopy, andUV-vis spectra were used to describe the properties of as-prepared samples. The electron paramagnetic resonance was used to detect the active species for the photodegradation reaction over g-C 3N4. The photodegradation mechanisms for two typical dyes, rhodamine B (Rh B) and methyl orange (MO), are proposed based on our comparison experiments. In the g-C3N4 photocatalysis system, the photodegradation of Rh B and MO is attributed to the direct hole oxidation and overall reaction, respectively; however, for the MO photodegradation the reduction process initiated by photogenerated electrons is a major photocatalytic process compared with the oxidation process induced by photogenerated holes. Boron doping for g-C3N4 can promote photodegradation of Rh B because the boron doping improves the dye adsorption and light absorption of catalyst. © 2010 American Chemical Society.

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