The preparation of peroxodisulfated zirconia titania(PSZT) solid super acid has been investigated as function of molar ratio of Ti to Zr, impregnation time, calcination time and temperature in esterification of maleic...The preparation of peroxodisulfated zirconia titania(PSZT) solid super acid has been investigated as function of molar ratio of Ti to Zr, impregnation time, calcination time and temperature in esterification of maleic anhydride with n octanol. The highest yield of dioctyl maleate was 98 2% at the optimum reaction conditions.展开更多
铬氧化物材料(Cr8O21)用作锂一次电池正极材料时放电倍率性能较差。利用高温固相法以Al_(2)O_(3)、TiO_(2)对Cr8O_(21)进行包覆改性,通过金属氧化物间的协同作用提升了Cr_(8)O_(21)的倍率性能。X射线衍射(XRD)结果显示包覆Al_(2)O_(3)、...铬氧化物材料(Cr8O21)用作锂一次电池正极材料时放电倍率性能较差。利用高温固相法以Al_(2)O_(3)、TiO_(2)对Cr8O_(21)进行包覆改性,通过金属氧化物间的协同作用提升了Cr_(8)O_(21)的倍率性能。X射线衍射(XRD)结果显示包覆Al_(2)O_(3)、TiO_(2)不会改变Cr_(8)O_(21)的晶体结构;扫描电子显微镜(SEM)、能量散射光谱(EDS)结果表明Al2O3和Ti O2都均匀包覆在Cr_(8)O_(21)表面。Cr_(8)O_(21)/Al_(2)O_(3)复合材料以质量比50∶1复合时放电性能最佳,比容量为342 m Ah/g (0.05 m A/cm^(2))、291 m Ah/g(1.0 m A/cm^(2)),容量保持率85%;Cr_(8)O_(21)/TiO_(2)复合材料以质量比100∶1复合时放电性能最佳,比容量为362 m Ah/g(0.05 m A/cm^(2))、303 m Ah/g (1.0 m A/cm^(2)),容量保持率83.75%。在大电流密度下无电压低头现象,容量保持率皆高于Cr8O21的容量保持率(75%)。展开更多
文摘The preparation of peroxodisulfated zirconia titania(PSZT) solid super acid has been investigated as function of molar ratio of Ti to Zr, impregnation time, calcination time and temperature in esterification of maleic anhydride with n octanol. The highest yield of dioctyl maleate was 98 2% at the optimum reaction conditions.
文摘铬氧化物材料(Cr8O21)用作锂一次电池正极材料时放电倍率性能较差。利用高温固相法以Al_(2)O_(3)、TiO_(2)对Cr8O_(21)进行包覆改性,通过金属氧化物间的协同作用提升了Cr_(8)O_(21)的倍率性能。X射线衍射(XRD)结果显示包覆Al_(2)O_(3)、TiO_(2)不会改变Cr_(8)O_(21)的晶体结构;扫描电子显微镜(SEM)、能量散射光谱(EDS)结果表明Al2O3和Ti O2都均匀包覆在Cr_(8)O_(21)表面。Cr_(8)O_(21)/Al_(2)O_(3)复合材料以质量比50∶1复合时放电性能最佳,比容量为342 m Ah/g (0.05 m A/cm^(2))、291 m Ah/g(1.0 m A/cm^(2)),容量保持率85%;Cr_(8)O_(21)/TiO_(2)复合材料以质量比100∶1复合时放电性能最佳,比容量为362 m Ah/g(0.05 m A/cm^(2))、303 m Ah/g (1.0 m A/cm^(2)),容量保持率83.75%。在大电流密度下无电压低头现象,容量保持率皆高于Cr8O21的容量保持率(75%)。
