以V_2O_5、C_(12)H_(22)O_(11)和AgNO_3为原料,采用水热法制备Ag掺杂VO_2(B)正极材料,通过XRD、FESEM、XPS、EDS、循环伏安(CV)、交流阻抗(EIS)等表征手段,研究掺Ag对VO_2(B)的结构、形貌及电化学性能的变化规律。结果表明,当掺杂量为0....以V_2O_5、C_(12)H_(22)O_(11)和AgNO_3为原料,采用水热法制备Ag掺杂VO_2(B)正极材料,通过XRD、FESEM、XPS、EDS、循环伏安(CV)、交流阻抗(EIS)等表征手段,研究掺Ag对VO_2(B)的结构、形貌及电化学性能的变化规律。结果表明,当掺杂量为0.43%(atom)时,样品(Ag_1)首次放电比容量为340.5 m A·h·g^(-1),较未掺杂样品(Ag_0)提高了80.5%。当掺杂量为1.28%(atom)时,样品(Ag_3)表现出最好的循环稳定性,首次放电容量为213.6 m A·h·g^(-1),100次循环后,容量保持率为58.3%。展开更多
A new six intraperitoneal injection insulin-mimetic vanadyl(Ⅱ) compounds [(VD3^-1)(VO^+2)(AAn^-1)](where(n=1~6);AA1=isoleucine, AA2=threonine, AA3=proline, AA4=phenylalanine, AA5=lysine and AA6=glutamine) were synthe...A new six intraperitoneal injection insulin-mimetic vanadyl(Ⅱ) compounds [(VD3^-1)(VO^+2)(AAn^-1)](where(n=1~6);AA1=isoleucine, AA2=threonine, AA3=proline, AA4=phenylalanine, AA5=lysine and AA6=glutamine) were synthesized by the chemical reactions between vitamin D3(VD3), VOSO4 and amino acids(AAn) with equal molar ratio 1∶1∶1 in neutralized media. The structures of these complexes were elucidated by spectroscopic methods like, infrared and solid reflectance spectroscopes. Magnetic moments and electronic spectra reveal square pyramid geometrical structure of the complexes. The infrared spectra assignments of these complexes revealed that the chelation towards vanadyl(Ⅳ) ions existed via deprotonation of the hydroxyl group of VD3 drug ligand and so amino acids act as bidentate ligand via N-amino and O-carboxylate groups. The anti-diabetic efficiency of these complexes were evaluated against streptozotocin induced diabetic male albino rats.展开更多
以V_2O_5作为钒源,乙二醇作为结构导向剂和还原剂,在不使用模板的情况下,通过水热法制备VO_2(B)纳米带阵列结构。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对合成产物的晶体结构和形貌进行表征,研究乙二醇的含...以V_2O_5作为钒源,乙二醇作为结构导向剂和还原剂,在不使用模板的情况下,通过水热法制备VO_2(B)纳米带阵列结构。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对合成产物的晶体结构和形貌进行表征,研究乙二醇的含量和水热反应时间对产物结构和形貌的影响。作为钠离子电池正极材料,研究水热反应时间和充放电电压范围对VO_2(B)电化学性能的影响。结果表明:当乙二醇含量为10 m L时,在180℃水热反应6 h所合成的VO_2(B)纳米带阵列在1.5~4 V的电压范围内具有更好的电化学性能。展开更多
A facile synthesis of vanadium oxide with reduced graphene oxide（rGO） is developed and used as cathode material for lithium ion batteries. VO_2（B） nanorods and VO_2（B）-rGO composite were prepared by a hydrotherm...A facile synthesis of vanadium oxide with reduced graphene oxide（rGO） is developed and used as cathode material for lithium ion batteries. VO_2（B） nanorods and VO_2（B）-rGO composite were prepared by a hydrothermal method using NaVO_3 precursor and sodium oxalate as a reducing agent. The monoclinic phase and nanorod like morphology of synthesized materials were confirmed by XRD, SEM, and TEM respectively. The electrochemical properties of samples were investigated at 1.5–4.0 V, and 0.1 C rate,and the VO_2（B） nanorods exhibit reversible capacity of about 159 mAh g^（-1）, whereas VO_2（B）-rGO exhibits 274 mAh g^（-1）. The reasonable discharge capacities were obtained at high rates. The enhanced performance in electrical energy storage system reveals the effectiveness of rGO in the composite, as it enhances the conductive electron pathway to overcome the intrinsic limits of single phase VO_2（B）.展开更多
VO2（B） nanosheets were prepared by a liquid-phase exfoliation from VO2（B） bulk.The lithium storage properties of VO2（B） nanosheets as capacity cathode materials for rechargeable lithium secondary batteries were ...VO2（B） nanosheets were prepared by a liquid-phase exfoliation from VO2（B） bulk.The lithium storage properties of VO2（B） nanosheets as capacity cathode materials for rechargeable lithium secondary batteries were investigated.It was found that the nanosheets with the thickness of several nanometers and width of tens of nanometer had a preferential growth direction along[001]orientation.By comparing with VO2（B） bulk,the VO2（B） nanosheets showed a higher initial discharge capacity and a slower capacity fading rate.The reasons for these phenomena were discussed and analyzed.展开更多
文摘以V_2O_5、C_(12)H_(22)O_(11)和AgNO_3为原料,采用水热法制备Ag掺杂VO_2(B)正极材料,通过XRD、FESEM、XPS、EDS、循环伏安(CV)、交流阻抗(EIS)等表征手段,研究掺Ag对VO_2(B)的结构、形貌及电化学性能的变化规律。结果表明,当掺杂量为0.43%(atom)时,样品(Ag_1)首次放电比容量为340.5 m A·h·g^(-1),较未掺杂样品(Ag_0)提高了80.5%。当掺杂量为1.28%(atom)时,样品(Ag_3)表现出最好的循环稳定性,首次放电容量为213.6 m A·h·g^(-1),100次循环后,容量保持率为58.3%。
文摘A new six intraperitoneal injection insulin-mimetic vanadyl(Ⅱ) compounds [(VD3^-1)(VO^+2)(AAn^-1)](where(n=1~6);AA1=isoleucine, AA2=threonine, AA3=proline, AA4=phenylalanine, AA5=lysine and AA6=glutamine) were synthesized by the chemical reactions between vitamin D3(VD3), VOSO4 and amino acids(AAn) with equal molar ratio 1∶1∶1 in neutralized media. The structures of these complexes were elucidated by spectroscopic methods like, infrared and solid reflectance spectroscopes. Magnetic moments and electronic spectra reveal square pyramid geometrical structure of the complexes. The infrared spectra assignments of these complexes revealed that the chelation towards vanadyl(Ⅳ) ions existed via deprotonation of the hydroxyl group of VD3 drug ligand and so amino acids act as bidentate ligand via N-amino and O-carboxylate groups. The anti-diabetic efficiency of these complexes were evaluated against streptozotocin induced diabetic male albino rats.
文摘以V_2O_5作为钒源,乙二醇作为结构导向剂和还原剂,在不使用模板的情况下,通过水热法制备VO_2(B)纳米带阵列结构。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对合成产物的晶体结构和形貌进行表征,研究乙二醇的含量和水热反应时间对产物结构和形貌的影响。作为钠离子电池正极材料,研究水热反应时间和充放电电压范围对VO_2(B)电化学性能的影响。结果表明:当乙二醇含量为10 m L时,在180℃水热反应6 h所合成的VO_2(B)纳米带阵列在1.5~4 V的电压范围内具有更好的电化学性能。
基金supported financially by DST-SERB Govt of India, New Delhi (SB/FT/CS-083/2012)DST Nanomission Govt.of India, New Delhi (Project No.SR/NM/NS-1262/2013 (G) dated 18-03-2015) for financial support
文摘A facile synthesis of vanadium oxide with reduced graphene oxide（rGO） is developed and used as cathode material for lithium ion batteries. VO_2（B） nanorods and VO_2（B）-rGO composite were prepared by a hydrothermal method using NaVO_3 precursor and sodium oxalate as a reducing agent. The monoclinic phase and nanorod like morphology of synthesized materials were confirmed by XRD, SEM, and TEM respectively. The electrochemical properties of samples were investigated at 1.5–4.0 V, and 0.1 C rate,and the VO_2（B） nanorods exhibit reversible capacity of about 159 mAh g^（-1）, whereas VO_2（B）-rGO exhibits 274 mAh g^（-1）. The reasonable discharge capacities were obtained at high rates. The enhanced performance in electrical energy storage system reveals the effectiveness of rGO in the composite, as it enhances the conductive electron pathway to overcome the intrinsic limits of single phase VO_2（B）.
基金financially supported by the National Natural Science Foundation of China(Nos.51372250 and 51402304)
文摘VO2（B） nanosheets were prepared by a liquid-phase exfoliation from VO2（B） bulk.The lithium storage properties of VO2（B） nanosheets as capacity cathode materials for rechargeable lithium secondary batteries were investigated.It was found that the nanosheets with the thickness of several nanometers and width of tens of nanometer had a preferential growth direction along[001]orientation.By comparing with VO2（B） bulk,the VO2（B） nanosheets showed a higher initial discharge capacity and a slower capacity fading rate.The reasons for these phenomena were discussed and analyzed.
