钠离子电池(sodium-ion batteries,SIBs)具有成本低的潜在优势,有望成为替代锂离子电池(lithium ion batteries,LIBs)的储能设备。为提升钠离子电池的性能,开发出适应钠离子脱嵌的负极材料尤为重要。硫化锑(Sb_(2)S_(3))因其理论比容量...钠离子电池(sodium-ion batteries,SIBs)具有成本低的潜在优势,有望成为替代锂离子电池(lithium ion batteries,LIBs)的储能设备。为提升钠离子电池的性能,开发出适应钠离子脱嵌的负极材料尤为重要。硫化锑(Sb_(2)S_(3))因其理论比容量高被认为是较好的钠离子电池负极材料。本文使用简单水热法将Sb_(2)S_(3)与石墨烯复合,制备Sb_(2)S_(3)/石墨烯复合材料(Sb_(2)S_(3)/Gr)。结果表明:Sb_(2)S_(3)/Gr作为钠离子电池负极时,不仅表现出良好的电导率(3.5×10~(-3)S/cm)和钠离子扩散速率(4.853×10~(-13)cm~2/s),而且在0.5 A/g的电流密度下,首圈库伦效率为76.27%,经150次循环后的比容量稳定在488 m A·h/g,表现出较高的比容量。Sb_(2)S_(3)/Gr复合材料表现出了极大的应用潜力,为高性能钠离子电池负极材料的研发提供了一定的参考价值。展开更多
通过探索一系列静电纺丝-硫化-煅烧等工艺参数,制备了N-掺杂碳纤维复合Sb_(2)S_(3)柔性电极材料(Sb_(2)S_(3)/NC),并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等对样品的晶体结构、微观...通过探索一系列静电纺丝-硫化-煅烧等工艺参数,制备了N-掺杂碳纤维复合Sb_(2)S_(3)柔性电极材料(Sb_(2)S_(3)/NC),并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等对样品的晶体结构、微观形貌及化学组成等进行了表征.制备的Sb_(2)S_(3)/NC纳米纤维具有优异的机械柔性和独特的复合结构.30 nm大小的Sb_(2)S_(3)纳米粒子相互连接成串珠状形貌,均匀地分散在N-掺杂碳纳米纤维中,有利于提高电子/离子的传输速率和电极材料的循环稳定性.Sb_(2)S_(3)/NC作为负极材料直接组装成的钠离子电池显示出优异的电化学性能,电流密度0.1和2.0 A g^(-1)下,比容量分别达到476.5和266.2 mAh g^(-1),0.1 A g^(-1)下循环280次后比容量保持为466.3 mAh g^(-1).展开更多
The efficient, green, facile, mild and straightforward conversion procedure for the oxidation of cyclic ketones to lactones at room temperature utilizing potassium peroxydisulfate （K2S2O8） in acidic media is satisfa...The efficient, green, facile, mild and straightforward conversion procedure for the oxidation of cyclic ketones to lactones at room temperature utilizing potassium peroxydisulfate （K2S2O8） in acidic media is satisfactory to high yields without using traditional chlorinated solvents is reported. This oxidative reagent is cheap and friendly environmental procedure for industrial purposes than use of organic peracids.展开更多
The reaction between sodium perfluoroalkanesulfinate(1)(Rf=a,Cl(CF_2)_4;b, Cl(CF_2)_6;c,Cl(CF_2)_8;d,n-C_6F_(13);e,n-C_8F_(17);f,H(CF_2)_4OCF_2CF_2)and phosphorus trichloride in acetonitrile at 0℃ resulted in the for...The reaction between sodium perfluoroalkanesulfinate(1)(Rf=a,Cl(CF_2)_4;b, Cl(CF_2)_6;c,Cl(CF_2)_8;d,n-C_6F_(13);e,n-C_8F_(17);f,H(CF_2)_4OCF_2CF_2)and phosphorus trichloride in acetonitrile at 0℃ resulted in the formation of an unstable intermediate,which was hydrolysed directly with aqueous sodium hydro- xide solution to give the corresponding perfluorocarboxylic acid in good yield.展开更多
3′-Daidzein sulfonate sodium（DSS） is a new synthetic water-soluble compound derived from daidzein,a soya isoflavone that plays regulatory roles in neurobiology.In this study,we hypothesized that the regulatory role...3′-Daidzein sulfonate sodium（DSS） is a new synthetic water-soluble compound derived from daidzein,a soya isoflavone that plays regulatory roles in neurobiology.In this study,we hypothesized that the regulatory role of DSS in neurobiology exhibits therapeutic effects on hippocampal damage and memory impairment.To validate this hypothesis,we established rat models of chronic cerebral hypoperfusion（CCH） by the permanent occlusion of the common carotid arteries using the two-vessel occlusion method.Three weeks after modeling,rat models were intragastrically administered 0.1,0.2,and 0.4 mg/kg DSS,once a day,for 5 successive weeks.The Morris water maze test was performed to investigate CCH-induced learning and memory deficits.TUNEL assay was used to analyze apoptosis in the hippocampal CA1,CA3 regions and dentate gyrus.Hematoxylin-eosin staining was performed to observe the morphology of neurons in the hippocampal CA1,CA3 regions and dentate gyrus.Western blot analysis was performed to investigate the phosphorylation of PKA,ERK1/2 and CREB in the hippocampal PKA/ERK1/2/CREB signaling pathway.Results showed that DSS treatment greatly improved the learning and memory deficits of rats with CCH,reduced apoptosis of neurons in the hippocampal CA1,CA3 regions and dentate gyrus,and increased the phosphorylation of PKA,ERK1/2,and CREB in the hippocampus.These findings suggest that DSS protects against CCH-induced memory impairment and hippocampal damage possibly through activating the PKA/ERK1/2/CREB signaling pathway.展开更多
文摘钠离子电池(sodium-ion batteries,SIBs)具有成本低的潜在优势,有望成为替代锂离子电池(lithium ion batteries,LIBs)的储能设备。为提升钠离子电池的性能,开发出适应钠离子脱嵌的负极材料尤为重要。硫化锑(Sb_(2)S_(3))因其理论比容量高被认为是较好的钠离子电池负极材料。本文使用简单水热法将Sb_(2)S_(3)与石墨烯复合,制备Sb_(2)S_(3)/石墨烯复合材料(Sb_(2)S_(3)/Gr)。结果表明:Sb_(2)S_(3)/Gr作为钠离子电池负极时,不仅表现出良好的电导率(3.5×10~(-3)S/cm)和钠离子扩散速率(4.853×10~(-13)cm~2/s),而且在0.5 A/g的电流密度下,首圈库伦效率为76.27%,经150次循环后的比容量稳定在488 m A·h/g,表现出较高的比容量。Sb_(2)S_(3)/Gr复合材料表现出了极大的应用潜力,为高性能钠离子电池负极材料的研发提供了一定的参考价值。
文摘通过探索一系列静电纺丝-硫化-煅烧等工艺参数,制备了N-掺杂碳纤维复合Sb_(2)S_(3)柔性电极材料(Sb_(2)S_(3)/NC),并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等对样品的晶体结构、微观形貌及化学组成等进行了表征.制备的Sb_(2)S_(3)/NC纳米纤维具有优异的机械柔性和独特的复合结构.30 nm大小的Sb_(2)S_(3)纳米粒子相互连接成串珠状形貌,均匀地分散在N-掺杂碳纳米纤维中,有利于提高电子/离子的传输速率和电极材料的循环稳定性.Sb_(2)S_(3)/NC作为负极材料直接组装成的钠离子电池显示出优异的电化学性能,电流密度0.1和2.0 A g^(-1)下,比容量分别达到476.5和266.2 mAh g^(-1),0.1 A g^(-1)下循环280次后比容量保持为466.3 mAh g^(-1).
基金support and purchase of Hewlett-Packard 6890 GC-Hewlett-Packard 5973N MSD instrument.
文摘The efficient, green, facile, mild and straightforward conversion procedure for the oxidation of cyclic ketones to lactones at room temperature utilizing potassium peroxydisulfate （K2S2O8） in acidic media is satisfactory to high yields without using traditional chlorinated solvents is reported. This oxidative reagent is cheap and friendly environmental procedure for industrial purposes than use of organic peracids.
文摘The reaction between sodium perfluoroalkanesulfinate(1)(Rf=a,Cl(CF_2)_4;b, Cl(CF_2)_6;c,Cl(CF_2)_8;d,n-C_6F_(13);e,n-C_8F_(17);f,H(CF_2)_4OCF_2CF_2)and phosphorus trichloride in acetonitrile at 0℃ resulted in the formation of an unstable intermediate,which was hydrolysed directly with aqueous sodium hydro- xide solution to give the corresponding perfluorocarboxylic acid in good yield.
基金supported by the National Natural Science Foundation of China,No.81560583the Natural Science Foundation of Jiangxi Province of China,No.20142BAB205021
文摘3′-Daidzein sulfonate sodium（DSS） is a new synthetic water-soluble compound derived from daidzein,a soya isoflavone that plays regulatory roles in neurobiology.In this study,we hypothesized that the regulatory role of DSS in neurobiology exhibits therapeutic effects on hippocampal damage and memory impairment.To validate this hypothesis,we established rat models of chronic cerebral hypoperfusion（CCH） by the permanent occlusion of the common carotid arteries using the two-vessel occlusion method.Three weeks after modeling,rat models were intragastrically administered 0.1,0.2,and 0.4 mg/kg DSS,once a day,for 5 successive weeks.The Morris water maze test was performed to investigate CCH-induced learning and memory deficits.TUNEL assay was used to analyze apoptosis in the hippocampal CA1,CA3 regions and dentate gyrus.Hematoxylin-eosin staining was performed to observe the morphology of neurons in the hippocampal CA1,CA3 regions and dentate gyrus.Western blot analysis was performed to investigate the phosphorylation of PKA,ERK1/2 and CREB in the hippocampal PKA/ERK1/2/CREB signaling pathway.Results showed that DSS treatment greatly improved the learning and memory deficits of rats with CCH,reduced apoptosis of neurons in the hippocampal CA1,CA3 regions and dentate gyrus,and increased the phosphorylation of PKA,ERK1/2,and CREB in the hippocampus.These findings suggest that DSS protects against CCH-induced memory impairment and hippocampal damage possibly through activating the PKA/ERK1/2/CREB signaling pathway.
