A novel and convenient hydrolysis and oxidation method was first used in preparation of carbon contained Y2O3 phosphor powders. The alloy was hydrolyzed in deionized water and the obtained Y(OH)3 powders were heat treated in air atmosphere. The final products - Y2O3 powders were micron clusters which were aggregated by hundreds of nanoparticles with the size of about 5 nm. The chemical composition, structural and morphological features of the samples were characterized by means of X-ray powder diffraction (XRD) analysis, transmission electron microscopy (TEM), Fourier-transform infrared (FT-IR) spectra, X-ray photoelectron spectra (XPS) and carbon sulfur analyzer. The obtained powders showed good bluish-white photoluminescence (PL) emissions (ranging from 430 to 600 nm, peaking at 468 nm and 578 nm) under the xenon light excitation. The luminescent mechanism was ascribed to the carbon impurities in the Y2O3 host.A novel and convenient hydrolysis and oxidation method is first used in preparation of carbon contained Y2O3 phosphor powders, which show good bluish-white photoluminescence (PL) emissions under xenon light excitation

•Zinc source is added into LiFePO4 precursor in the form of Zn(OH)2 solution.•ZnO help LiFePO4 form fine and even particles in the hydrothermal condition.•ZnO particles and Zn2+ ions act on the electrochemical performance of LiFePO4 together.LiFePO4 particles doped with zinc oxide was synthesized via a hydrothermal route and used as cathode material for lithium-ion battery. Sample of preferable shape and structure was obtained by a concise and efficient process. ZnO doping into the LiFePO4 matrix was positively confirmed by the results of X-ray diffraction (XRD); high-resolution transmission electron microscopy (HRTEM); energy dispersive spectrometer (EDS), and X-ray photoelectron spectroscopy (XPS). LiFePO4 doped with ZnO tends to form nanometer-size and homogeneous particles, which can improve markedly the performance and stability of charge-discharge cycle. A specific discharge capacity of ZnO-doped LiFePO4 at 132.3 mAh g−1 was achieved, with 1.8% decrease after 100 cycles. Based on the cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) results, it has further shown that ZnO doping effectively reduces the impacts of polarization and transfer resistance during electrochemical processes.

This paper designs and fabricates CeO2 nanoparticles on a large scale by hydrolysis and oxidation of cerium carbide. The electrochemical supercapacitor behavior of CeO2 nanoparticles was investigated. The nickel foam (NF) supported CeO2 nanoparticles show a high areal capacitance of 119 mF/cm2, demonstrating a strong synergistic effect between NF and CeO2 nanoparticles. The high capacitance of the CeO2/NF nanoparticles is possibly due to an improved conductivity by NF and a better utilization of CeO2 nanoparticles.