Nanostructured transition metal oxides are promising alternative anodes for lithium ion batteries. Li-ion storage performance is expected to improve if high packing density energy particles are available. Herein, Mn2O...Nanostructured transition metal oxides are promising alternative anodes for lithium ion batteries. Li-ion storage performance is expected to improve if high packing density energy particles are available. Herein, Mn2O3 microspheres with a ca. 18 μm diameter and a tapped density of 1.33 g/cm3 were synthesized by a facile solvothermal-thermal coversion route. Spherical MnCO3 precursors were obtained through solvotbermal treatment and they decomposed and converted into Mn2O3 microspheres at an annealing temperature of 700℃. The Mn2O3 microspheres consisted of Mn2O3 nanoparticles with an average 40 nm diameter. These porous Mn2O3 microspheres allow good electrolyte penetration and provide an ion buffer reservoir to ensure a constant electrolyte supply. The Mn2O3 microspheres have reversible capacities of 590 and 320 mAh/g at 50 and 400 mA/g, respectively. We thus report an efficient route for the fabrication of energy particles for advanced energy storage.展开更多
The development of highly active and enantioselective ligands and catalysts for the asymmetric hydrogenation of ketone has been the goal of synthetic chemists for more than fifty years.Herein,a series of ferrocene-bas...The development of highly active and enantioselective ligands and catalysts for the asymmetric hydrogenation of ketone has been the goal of synthetic chemists for more than fifty years.Herein,a series of ferrocene-based tetradentate ligands were developed and applied in Ir-catalysed asymmetric hydrogenation of ketone.The hydrolytic ring-opening of the oxazoline moiety of ligand f-amphox leads to the accidental discovery of a highly efficient and enantioselective tetradentate ligand f-phamidol which showed extraordinarily high reactivity and enantioselectivity(up to 99%yield,up to>99%ee and up to 1,000,000 TON).In addition,two types of other tetradentate ligands f-phamida and f-phamide were also synthesized and evaluated.展开更多
基金supported by the National Natural Science Foundation of China(21422604)the PetroChina Technology R&D Project on New Technology and the Method for Oil & Gas Development(2011A-1006)CNPC Innovation Foundation (2014D-5006-0207)
文摘Nanostructured transition metal oxides are promising alternative anodes for lithium ion batteries. Li-ion storage performance is expected to improve if high packing density energy particles are available. Herein, Mn2O3 microspheres with a ca. 18 μm diameter and a tapped density of 1.33 g/cm3 were synthesized by a facile solvothermal-thermal coversion route. Spherical MnCO3 precursors were obtained through solvotbermal treatment and they decomposed and converted into Mn2O3 microspheres at an annealing temperature of 700℃. The Mn2O3 microspheres consisted of Mn2O3 nanoparticles with an average 40 nm diameter. These porous Mn2O3 microspheres allow good electrolyte penetration and provide an ion buffer reservoir to ensure a constant electrolyte supply. The Mn2O3 microspheres have reversible capacities of 590 and 320 mAh/g at 50 and 400 mA/g, respectively. We thus report an efficient route for the fabrication of energy particles for advanced energy storage.
基金X.Zhang is indebted to the National Key R&D Program of China(No.2021YFA1500201)the Shenzhen Science and Technology Innovation Committee(SSTIC)(No.KQTD2015071710315717)+5 种基金Stable Support Plan Program of Shenzhen Natural Science Fund(No.20200925161222002)Key-Area Research and Development Program of Guangdong Province(No.2020B010188001)Innovative Team of Universities in Guangdong Province(No.2020KCXTD016)National Natural Science Foundation of China(No.21991113)G.Q.Chen gratefully acknowledges the National Natural Science Foundation of China(Nos.21901107 and 22171129)SSTIC(No.JCYJ20210324104202007)for financial support.
文摘The development of highly active and enantioselective ligands and catalysts for the asymmetric hydrogenation of ketone has been the goal of synthetic chemists for more than fifty years.Herein,a series of ferrocene-based tetradentate ligands were developed and applied in Ir-catalysed asymmetric hydrogenation of ketone.The hydrolytic ring-opening of the oxazoline moiety of ligand f-amphox leads to the accidental discovery of a highly efficient and enantioselective tetradentate ligand f-phamidol which showed extraordinarily high reactivity and enantioselectivity(up to 99%yield,up to>99%ee and up to 1,000,000 TON).In addition,two types of other tetradentate ligands f-phamida and f-phamide were also synthesized and evaluated.
