Green nanophosphors(Gd,Y)PO4:Tb were prepared by solid state chemical reaction of precursors at room temperature.The formation process,particle-size,shape and fluorescence properties of the phosphor were characterized...Green nanophosphors(Gd,Y)PO4:Tb were prepared by solid state chemical reaction of precursors at room temperature.The formation process,particle-size,shape and fluorescence properties of the phosphor were characterized by means of XRD,TEM and solid fluorescence techniques.The results indicate the nanophosphor of(Gd,Y)PO4:Tb belong to the monoclinic system,its space group is P21/ n,its average particle size is 35nm,has better particle dispersion.The phosphor exhibits green fluorescence when excited by ultraviolet radiation of 380nm wavelength.The strongest peak is at 545nm,which assigned to 5D4→7F5 transition of Tb3+ ion.The phosphor is a kind of efficient green-emitting luminescence material.展开更多
以MnSO_4,(NH_4)_2S_2O_8为反应物,Ag^+作为催化剂的溶液相方法合成了线团状的α-MnO_2。采用XRD、SEM和TEM等手段对合成产物进行了表征。发现反应温度和反应时间对产物的结晶度和形貌有很大的影响。通过恒电流充电/放电测试和循环伏安...以MnSO_4,(NH_4)_2S_2O_8为反应物,Ag^+作为催化剂的溶液相方法合成了线团状的α-MnO_2。采用XRD、SEM和TEM等手段对合成产物进行了表征。发现反应温度和反应时间对产物的结晶度和形貌有很大的影响。通过恒电流充电/放电测试和循环伏安法(CV)对最终产物的电化学性能进行了表征。结果表明,由于其独特的形态,25℃下反应2d的产物作为锂离子电池正极材料,表现出良好的循环稳定性(100次循环后放电比容量为124 m Ah·g^(-1))。线团状α-MnO_2在锂离子电池应用中可能是一个潜在的正极材料。展开更多
文摘Green nanophosphors(Gd,Y)PO4:Tb were prepared by solid state chemical reaction of precursors at room temperature.The formation process,particle-size,shape and fluorescence properties of the phosphor were characterized by means of XRD,TEM and solid fluorescence techniques.The results indicate the nanophosphor of(Gd,Y)PO4:Tb belong to the monoclinic system,its space group is P21/ n,its average particle size is 35nm,has better particle dispersion.The phosphor exhibits green fluorescence when excited by ultraviolet radiation of 380nm wavelength.The strongest peak is at 545nm,which assigned to 5D4→7F5 transition of Tb3+ ion.The phosphor is a kind of efficient green-emitting luminescence material.
文摘以MnSO_4,(NH_4)_2S_2O_8为反应物,Ag^+作为催化剂的溶液相方法合成了线团状的α-MnO_2。采用XRD、SEM和TEM等手段对合成产物进行了表征。发现反应温度和反应时间对产物的结晶度和形貌有很大的影响。通过恒电流充电/放电测试和循环伏安法(CV)对最终产物的电化学性能进行了表征。结果表明,由于其独特的形态,25℃下反应2d的产物作为锂离子电池正极材料,表现出良好的循环稳定性(100次循环后放电比容量为124 m Ah·g^(-1))。线团状α-MnO_2在锂离子电池应用中可能是一个潜在的正极材料。
文摘以Fe Cl3·7H2O和Na2Mo O4为原料,采用水热合成法制备三维花状Fe2(Mo O4)3微米球。探讨不同合成温度对样品形貌的影响,利用XRD、SEM和EDS等分析技术对样品的结构、形貌进行了表征,对该材料的电化学性能进行了测试。结果表明:Fe2(Mo O4)3微米球是由二维纳米片自组装而成的花状结构,合成温度为160℃时,制备的样品具有良好的电化学性能,当电流密度为100 m A·g-1,首次放电比容量为1 431 m Ah·g-1;并具有较好的循环性能和倍率性能。并对160℃合成样品表现较好电化学性能的原因进行了探讨。
