MoS_(2)的理论比容量高(670 mAh g^(-1)),层间距大,有利于钠离子的嵌入脱出,但由于充放电过程中会不可避免地产生体积膨胀进而造成堆叠,导致容量衰减。合成超小MoS_(2)片与碳材料复合可以有效解决MoS_(2)充放电过程中产生的堆叠问题。...MoS_(2)的理论比容量高(670 mAh g^(-1)),层间距大,有利于钠离子的嵌入脱出,但由于充放电过程中会不可避免地产生体积膨胀进而造成堆叠,导致容量衰减。合成超小MoS_(2)片与碳材料复合可以有效解决MoS_(2)充放电过程中产生的堆叠问题。本工作利用粗酞菁作为前驱体,成功地合成出锚定在3D纳米碳上的超薄MoS_(2).少层的MoS_(2)提供了更多的空间,缓解了钠离子嵌入脱出引起的体积膨胀,并且当固定在碳材料上时,MoS_(2)的(002)层间距提高到了0.67 nm.此外,所得的材料在0.1 C循环200圈后仍能保持356 mAh g^(-1)的比容量,库伦效率保持在99.8%.展开更多
以生物质废弃物柚子皮为原材料,采用先水热后碳化的方法,制备出三维碳纳米材料.通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等分析手段对产物的物相、形貌进行了表征分析,并将产物作为钠离子电池的负极材料,研究...以生物质废弃物柚子皮为原材料,采用先水热后碳化的方法,制备出三维碳纳米材料.通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等分析手段对产物的物相、形貌进行了表征分析,并将产物作为钠离子电池的负极材料,研究不同碳化温度对其电化学性能的影响.结果表明,当碳化温度为600℃时得到的三维碳纳米材料电化学性能最好,在50 m A·g^(-1)电流密度下,初始放电比容量高达430 m Ah·g^(-1),500圈循环后容量保持率可达稳定时的90%.展开更多
Two new complexes [Cu（dafo）2（en）]（ClO4）2·2H2O （en=NH2CH2CH2NH2） 1 and [Cu（dafo）2（dap）]（ClO4）2·2H2O [dap=NH2CH2CH（CH3）NH2] 2 （dafo=4,5-diazafluoren-9-one） have been synthesized and character...Two new complexes [Cu（dafo）2（en）]（ClO4）2·2H2O （en=NH2CH2CH2NH2） 1 and [Cu（dafo）2（dap）]（ClO4）2·2H2O [dap=NH2CH2CH（CH3）NH2] 2 （dafo=4,5-diazafluoren-9-one） have been synthesized and characterized by elemental analysis, IR and UV spectra. Meanwhile, the complex 1 has been characterized by single crystal X-ray diffraction analysis. The initial DNA binding interactions of the complexes 1 and 2 have been investigated by UV spectra, emission spectra and cyclic voltammogram. Concluding the results of three methods used to measure the interaction of complexes 1 and 2 with DNA, the action mode of the two complexes with DNA is intercalation, and character of ligands and steric effect may affect the interaction of the complexes with DNA.展开更多
文摘MoS_(2)的理论比容量高(670 mAh g^(-1)),层间距大,有利于钠离子的嵌入脱出,但由于充放电过程中会不可避免地产生体积膨胀进而造成堆叠,导致容量衰减。合成超小MoS_(2)片与碳材料复合可以有效解决MoS_(2)充放电过程中产生的堆叠问题。本工作利用粗酞菁作为前驱体,成功地合成出锚定在3D纳米碳上的超薄MoS_(2).少层的MoS_(2)提供了更多的空间,缓解了钠离子嵌入脱出引起的体积膨胀,并且当固定在碳材料上时,MoS_(2)的(002)层间距提高到了0.67 nm.此外,所得的材料在0.1 C循环200圈后仍能保持356 mAh g^(-1)的比容量,库伦效率保持在99.8%.
文摘以生物质废弃物柚子皮为原材料,采用先水热后碳化的方法,制备出三维碳纳米材料.通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等分析手段对产物的物相、形貌进行了表征分析,并将产物作为钠离子电池的负极材料,研究不同碳化温度对其电化学性能的影响.结果表明,当碳化温度为600℃时得到的三维碳纳米材料电化学性能最好,在50 m A·g^(-1)电流密度下,初始放电比容量高达430 m Ah·g^(-1),500圈循环后容量保持率可达稳定时的90%.
基金funded by the National Natural Science Foundation of China under Grant No.50832004the Research Fund of State Key Laborat ory of Solidification Processing (NWPU),China(Grant No.25-TZ-2009)the Doctorate Foundation of Northwestern Polytechnical University~~
基金Project supported by the Program for Changjiang Scholars and Innovative Research Team in University, PCSIRT （No. IRT 0559）, the National Natural Science Foundation of China （No. 20671076）, the Major State Basic Research Development Program of China （the 973 Program, No. 2003CB214606）, the Key Laboratory Research and Establishment Program of Shaanxi Education Section （No. 03JS006）, and the Special Foundation of Shaanxi Education Section （No. 04JK143）.
文摘Two new complexes [Cu（dafo）2（en）]（ClO4）2·2H2O （en=NH2CH2CH2NH2） 1 and [Cu（dafo）2（dap）]（ClO4）2·2H2O [dap=NH2CH2CH（CH3）NH2] 2 （dafo=4,5-diazafluoren-9-one） have been synthesized and characterized by elemental analysis, IR and UV spectra. Meanwhile, the complex 1 has been characterized by single crystal X-ray diffraction analysis. The initial DNA binding interactions of the complexes 1 and 2 have been investigated by UV spectra, emission spectra and cyclic voltammogram. Concluding the results of three methods used to measure the interaction of complexes 1 and 2 with DNA, the action mode of the two complexes with DNA is intercalation, and character of ligands and steric effect may affect the interaction of the complexes with DNA.
