采用一步滴涂法在掺氟二氧化锡(FTO)导电玻璃上制备了Bi_(1-x)Fe_(x)VO_4(x=0,0.05,0.10,0.25,0.40)薄膜,表征了其结构、形貌、光学以及光电化学方面的性质.结果表明,掺入Fe后Bi_(1-x)Fe_(x)VO_(4)薄膜的光电流密度与BiVO_(4)薄膜相比...采用一步滴涂法在掺氟二氧化锡(FTO)导电玻璃上制备了Bi_(1-x)Fe_(x)VO_4(x=0,0.05,0.10,0.25,0.40)薄膜,表征了其结构、形貌、光学以及光电化学方面的性质.结果表明,掺入Fe后Bi_(1-x)Fe_(x)VO_(4)薄膜的光电流密度与BiVO_(4)薄膜相比均有所提高,其中25%Fe-BiVO_(4)薄膜表现出最优的光电化学性能.在0.1 mol/L磷酸缓冲溶液(pH=7.0)中,1.23 V(vs.RHE)电势下25%Fe-BiVO_(4)薄膜的光电流密度为0.50 m A/cm~2,与BiVO_(4)薄膜的0.15m A/cm^(2)相比提高了3倍多.结合X射线衍射(XRD)、拉曼光谱(Raman)和X射线光电子能谱(XPS)表征结果证实Fe~(3+)以FeVO_(4)的形式存在于Bi_(1-x)Fe_(x)VO_(4)薄膜中,形成了BiVO_(4)/FeVO_(4)复合物薄膜.紫外-可见光谱(UV-Vis)结果显示,所有Bi_(1-x)Fe_(x)VO_4薄膜的禁带宽度均为2.4~2.5 e V.25%Fe-BiVO_(4)薄膜光电化学性能的提升主要归因于光生载流子转移效率(η_(trans))和分离效率(η_(sep))的提高.能级结构图表明,BiVO_(4)和FeVO_(4)之间可以形成TypeⅡ型能级结构排列,可以促进光生载流子的分离与转移,是25%Fe-BiVO_(4)薄膜光电化学性能提升的内在机理.展开更多
In the presence of active metal bismuth (Bi) which was prepared from the combination of bismuth trichloride and sodium borohydride,aldehydes have been found to react with allyl bromide in aqueous media,and the corresp...In the presence of active metal bismuth (Bi) which was prepared from the combination of bismuth trichloride and sodium borohydride,aldehydes have been found to react with allyl bromide in aqueous media,and the corresponding homoallylic alcohols were obtained in excellent yields with high chemo-and stereoselectivity.展开更多
New composition perovskite-type compounds with formula Sr0.6Bi0.4FeO2.7,Sr1-xBixFeO3-y(x=0.1 to 0. 9 in interveral of 0.1),and Ba1.5Pt0.5Mn2O6 have been synthsized and structurally characterized.The crystal structure ...New composition perovskite-type compounds with formula Sr0.6Bi0.4FeO2.7,Sr1-xBixFeO3-y(x=0.1 to 0. 9 in interveral of 0.1),and Ba1.5Pt0.5Mn2O6 have been synthsized and structurally characterized.The crystal structure of Sr0.6Bi0.4FeO2.7has been determined by X-ray single crystal diffraction,and the data of neutron powder diffraction collected at both room temperature and elevated temperature(380℃).The compound Sr0.6Bi0.4FeO2.7 crystallizes in the cubic space group of Pm3m with Z=1,a=3.9330(6) at room temperature,a=3.9498(6)A at 380℃.The magnetic structure from the neutron powder diffraction data collected at room temperature is consistent with a simple G-type antiferromagnetism and has a magnetic moment of 4.98 μB per Fe atom.The structures of Sr1-xBixFeO3-y with x other than 0.4 were also refined from the X-ray powder diffraction data.The data were consistent with a tetragonal cell when x=0.1,a rhombohedral cell when x= 0.9,and a cubic cell for x=0.2～0.8.From single crystal X-ray diffraction data,Ba1.5Pt0.5Mn2O6 crystallizes in hexagonal space group of P63mc with a= 5.7722 (6),c=4.4504(9),V=128.42(2),Z=1.The Sr(1-x)BixFeO(3-y)are found to be a good electronic and ionic conductor.展开更多
In the presence of samarium-bismuth(III) chloride, inter-molecular aldol typereactions of α-bromoacetophenone with various aldehydes in tetrahydrofuran-water mixed solventafford β-hydroxy ketones in moderate to good...In the presence of samarium-bismuth(III) chloride, inter-molecular aldol typereactions of α-bromoacetophenone with various aldehydes in tetrahydrofuran-water mixed solventafford β-hydroxy ketones in moderate to good yields under mild and neutral conditions.展开更多
文摘采用一步滴涂法在掺氟二氧化锡(FTO)导电玻璃上制备了Bi_(1-x)Fe_(x)VO_4(x=0,0.05,0.10,0.25,0.40)薄膜,表征了其结构、形貌、光学以及光电化学方面的性质.结果表明,掺入Fe后Bi_(1-x)Fe_(x)VO_(4)薄膜的光电流密度与BiVO_(4)薄膜相比均有所提高,其中25%Fe-BiVO_(4)薄膜表现出最优的光电化学性能.在0.1 mol/L磷酸缓冲溶液(pH=7.0)中,1.23 V(vs.RHE)电势下25%Fe-BiVO_(4)薄膜的光电流密度为0.50 m A/cm~2,与BiVO_(4)薄膜的0.15m A/cm^(2)相比提高了3倍多.结合X射线衍射(XRD)、拉曼光谱(Raman)和X射线光电子能谱(XPS)表征结果证实Fe~(3+)以FeVO_(4)的形式存在于Bi_(1-x)Fe_(x)VO_(4)薄膜中,形成了BiVO_(4)/FeVO_(4)复合物薄膜.紫外-可见光谱(UV-Vis)结果显示,所有Bi_(1-x)Fe_(x)VO_4薄膜的禁带宽度均为2.4~2.5 e V.25%Fe-BiVO_(4)薄膜光电化学性能的提升主要归因于光生载流子转移效率(η_(trans))和分离效率(η_(sep))的提高.能级结构图表明,BiVO_(4)和FeVO_(4)之间可以形成TypeⅡ型能级结构排列,可以促进光生载流子的分离与转移,是25%Fe-BiVO_(4)薄膜光电化学性能提升的内在机理.
文摘In the presence of active metal bismuth (Bi) which was prepared from the combination of bismuth trichloride and sodium borohydride,aldehydes have been found to react with allyl bromide in aqueous media,and the corresponding homoallylic alcohols were obtained in excellent yields with high chemo-and stereoselectivity.
文摘New composition perovskite-type compounds with formula Sr0.6Bi0.4FeO2.7,Sr1-xBixFeO3-y(x=0.1 to 0. 9 in interveral of 0.1),and Ba1.5Pt0.5Mn2O6 have been synthsized and structurally characterized.The crystal structure of Sr0.6Bi0.4FeO2.7has been determined by X-ray single crystal diffraction,and the data of neutron powder diffraction collected at both room temperature and elevated temperature(380℃).The compound Sr0.6Bi0.4FeO2.7 crystallizes in the cubic space group of Pm3m with Z=1,a=3.9330(6) at room temperature,a=3.9498(6)A at 380℃.The magnetic structure from the neutron powder diffraction data collected at room temperature is consistent with a simple G-type antiferromagnetism and has a magnetic moment of 4.98 μB per Fe atom.The structures of Sr1-xBixFeO3-y with x other than 0.4 were also refined from the X-ray powder diffraction data.The data were consistent with a tetragonal cell when x=0.1,a rhombohedral cell when x= 0.9,and a cubic cell for x=0.2～0.8.From single crystal X-ray diffraction data,Ba1.5Pt0.5Mn2O6 crystallizes in hexagonal space group of P63mc with a= 5.7722 (6),c=4.4504(9),V=128.42(2),Z=1.The Sr(1-x)BixFeO(3-y)are found to be a good electronic and ionic conductor.
基金theNationalNaturalScienceFoundationofChina (No .2 0 0 72 0 33)andtheNaturalScienceFoundationofZhejiangProvince ,China
文摘In the presence of samarium-bismuth(III) chloride, inter-molecular aldol typereactions of α-bromoacetophenone with various aldehydes in tetrahydrofuran-water mixed solventafford β-hydroxy ketones in moderate to good yields under mild and neutral conditions.
基金financially supported by the National Natural Science Foundation of China(22072107 and 21872105)the Science&Technology Commission of Shanghai Municipality(19DZ2271500)the Fundamental Research Funds for the Central Universities。
