The α-SiC in 0.5μm size powders were coated with Al_2O_3 and Y_2O_3 by a coprecipitation coating (CPC) method forfabrication of SiC/YAG composites. The same powder preparation was carried out by conventional mechani...The α-SiC in 0.5μm size powders were coated with Al_2O_3 and Y_2O_3 by a coprecipitation coating (CPC) method forfabrication of SiC/YAG composites. The same powder preparation was carried out by conventional mechanical mixing(MM) method for comparison. Two kinds of SiC/YAG composites were manufactured by pressureless sintering usingthe different powders, named CPC composite and MM composite thereafter respectively. It is shown that the CPCcomposite has the advantages of homogeneous distribution of YAG phase and of being sintered to high density ata low temperature, 100℃ lower than that of MM composite. The strength (573 MPa) and hardness (23.3 GPa) ofthe CPC composite are significantly higher than those (323 MPa and 13.5 GPa) of the MM composite, respectively.展开更多
Herein,we disclosed the g-C_(3)N_(4)/LaFeO_(3) nanocomposite photocatalyst,a mediator-free direct Z-scheme photocatalytic system,prepared using a mechanical mixing method with reliable interfacial interactions. The na...Herein,we disclosed the g-C_(3)N_(4)/LaFeO_(3) nanocomposite photocatalyst,a mediator-free direct Z-scheme photocatalytic system,prepared using a mechanical mixing method with reliable interfacial interactions. The nanocomposite formation was determined by X-ray diffraction (XRD),transmission electron microscopy (TEM),and X-ray photoelectron spectroscopy (XPS). The optical properties of the nanohybrids were also characterized using UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectroscopy. The results clearly indicated that the g-C_(3)N_(4)/LaFeO_(3) nanocomposite was effectively fabricated,with reliable interfacial interactions and a good heterojunction interaction between g-C_(3)N_(4) and LaFeO_(3),which can considerably enhance the photocatalytic activity as compared to pristine g-C_(3)N_(4) and LaFeO_(3). The high HER (1152 μmol h^(−1) g^(−1)) was also confirmed by the PL spectra,Mott–Schottky plot,electrochemical impedance spectroscopy (EIS),and solid–solid interfacial interactions.展开更多
基金This work was supported by the National Natural Science Foundation of China(No.50372041)National“863”Plan(No.2003AA305620).
文摘The α-SiC in 0.5μm size powders were coated with Al_2O_3 and Y_2O_3 by a coprecipitation coating (CPC) method forfabrication of SiC/YAG composites. The same powder preparation was carried out by conventional mechanical mixing(MM) method for comparison. Two kinds of SiC/YAG composites were manufactured by pressureless sintering usingthe different powders, named CPC composite and MM composite thereafter respectively. It is shown that the CPCcomposite has the advantages of homogeneous distribution of YAG phase and of being sintered to high density ata low temperature, 100℃ lower than that of MM composite. The strength (573 MPa) and hardness (23.3 GPa) ofthe CPC composite are significantly higher than those (323 MPa and 13.5 GPa) of the MM composite, respectively.
文摘Herein,we disclosed the g-C_(3)N_(4)/LaFeO_(3) nanocomposite photocatalyst,a mediator-free direct Z-scheme photocatalytic system,prepared using a mechanical mixing method with reliable interfacial interactions. The nanocomposite formation was determined by X-ray diffraction (XRD),transmission electron microscopy (TEM),and X-ray photoelectron spectroscopy (XPS). The optical properties of the nanohybrids were also characterized using UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectroscopy. The results clearly indicated that the g-C_(3)N_(4)/LaFeO_(3) nanocomposite was effectively fabricated,with reliable interfacial interactions and a good heterojunction interaction between g-C_(3)N_(4) and LaFeO_(3),which can considerably enhance the photocatalytic activity as compared to pristine g-C_(3)N_(4) and LaFeO_(3). The high HER (1152 μmol h^(−1) g^(−1)) was also confirmed by the PL spectra,Mott–Schottky plot,electrochemical impedance spectroscopy (EIS),and solid–solid interfacial interactions.
