Search

Molybdenum diselenide (MoSe 2) have attracted much attention as an anode material for lithium/sodium ion batteries due to its specific layered structure. Here, highly-uniform MoSe 2 nanoparticles are successfully synthesized via a one-pot hydrothermal method with addition of polyvinyl pyrrolidone (PVP) following by calcination treatment. PVP serves as a surfactant preventing the over-agglomeration of MoSe 2 nanosheets and contributing to the well-organized accumulation of MoSe 2 nanosheets into nanoparticles. When evaluated as anode for lithium ion batteries, the MoSe 2 nanoparticles show enhanced cycle stability and rate performance comparing to the MoSe 2 bulk prepared without addition of PVP. After 200 cycles, the MoSe 2 nanoparticles remain a specific capacity of 573.9 mAh g−1 at a rate of 200 mA g−1. Meanwhile, MoSe 2 nanoparticles also display good sodium storage performance. Under the current density of 500 mA g−1, MoSe 2 nanoparticles exhibit reversible capacity of 374.9 mA h g−1 after 100 cycles. [Display omitted] • Highly-uniform MoSe2 nanoparticles are successfully synthesized via a simple method. • The effect of PVP during the particle formation has been studied in detail. • The as-prepared MoSe2 nanoparticles show enhanced electrochemical performance as anode materials. [ABSTRACT FROM AUTHOR]

Supported perovskite promoted catalysts La 2 NiMnO 6 –CuCl 2 /γ-Al 2 O 3 and La 1.7 K 0.3 NiMnO 6 –CuCl 2 /γ-Al 2 O 3 were prepared by mechanical mixing method, and characterized by XRD, H 2 -TPR, XRF, XPS and magnetization techniques. The catalyst doped with potassium La 1.7 K 0.3 NiMnO 6 –CuCl 2 /γ-Al 2 O 3 possesses a large amount of Mn 4+ and surface-adsorbed oxygen species, which accelerate the oxidation of Cu + by a circular reaction and increase the release of Cl 2 , and therefore promote the conversion of C 2 H 6 and the selectivity to C 2 H 3 Cl. The catalyst La 1.7 K 0.3 NiMnO 6 –CuCl 2 /γ-Al 2 O 3 shows better catalytic activity for ethane oxychlorination with the C 2 H 6 conversion of 100% and the C 2 H 3 Cl selectivity to 59.4%. The total selectivity to C 2 H 4 and C 2 H 3 Cl maintains over 81% in 95 h. This study points out a potential way to develop more active perovskite-type oxide catalysts for ethane oxychlorination. [ABSTRACT FROM AUTHOR]