A novel process for preparation of micrometer-scale functional materials without organic templates has been demonstrated. Titania spheroid with a tailored core-shell structure and high ordered mesoposity has been mani...A novel process for preparation of micrometer-scale functional materials without organic templates has been demonstrated. Titania spheroid with a tailored core-shell structure and high ordered mesoposity has been manipulated in the ethanol hydrothermal system containing ammonia sulfate as a dispersant. Titania spheroid with a mean diameter of 3.6 μm and a high specific surface area of 266 m 2/g has been synthesized by precipitating titanium tetrachloride with ammonia gas released from hydrolysis of urea at a high temperature. A special core-shell structure with a 100 nm thin shell and a 300 nm spacing strip interiors has been characterized by SEM & TEM. The catalytic performance of the titania spheoid supported WO 3 catalyst for the selective oxidation of cyclopentene(CPE) to glutaraldehyde(GA) has been investigated. The WO 3/TiO 2 spheroid catalyst displays an exciting prospect for good selectivity(72.9%) toward GA and a high GA yield(about 70%) for the titled reaction using aqueous H 2O 2 as the oxidant.展开更多
以四氯化钛、盐酸为原料,制备出花状TiO_2纳米微球,利用扫描电子显微镜(SEM)、X射线衍射(XRD)等测试方法,对样品的结构和形貌进行了表征。为了提高TiO_2微球电池的光电性能,利用TiO_2微球作为反射层构造了双层结构的薄膜电极,结果表明,...以四氯化钛、盐酸为原料,制备出花状TiO_2纳米微球,利用扫描电子显微镜(SEM)、X射线衍射(XRD)等测试方法,对样品的结构和形貌进行了表征。为了提高TiO_2微球电池的光电性能,利用TiO_2微球作为反射层构造了双层结构的薄膜电极,结果表明,双层结构染料敏化太阳能电池在100 m W·cm-2(1.5 G)光照条件下,短路光电流Jsc=17.64 m A·cm-2,开路光电压Voc=0.74 V,填充因子FF=0.63和光电转化效率η=8.33%。相比TiO_2微球制备的太阳能电池,双层结构染料敏化太阳能电池光电转化效率提高至5.3倍。最后对电极中染料的吸附量、电极的光散射性能和电池的电化学阻抗做了进一步研究和分析,研究表明,双层结构电池增强光的捕获能力,从而提高光伏性能。展开更多
文摘A novel process for preparation of micrometer-scale functional materials without organic templates has been demonstrated. Titania spheroid with a tailored core-shell structure and high ordered mesoposity has been manipulated in the ethanol hydrothermal system containing ammonia sulfate as a dispersant. Titania spheroid with a mean diameter of 3.6 μm and a high specific surface area of 266 m 2/g has been synthesized by precipitating titanium tetrachloride with ammonia gas released from hydrolysis of urea at a high temperature. A special core-shell structure with a 100 nm thin shell and a 300 nm spacing strip interiors has been characterized by SEM & TEM. The catalytic performance of the titania spheoid supported WO 3 catalyst for the selective oxidation of cyclopentene(CPE) to glutaraldehyde(GA) has been investigated. The WO 3/TiO 2 spheroid catalyst displays an exciting prospect for good selectivity(72.9%) toward GA and a high GA yield(about 70%) for the titled reaction using aqueous H 2O 2 as the oxidant.
文摘以四氯化钛、盐酸为原料,制备出花状TiO_2纳米微球,利用扫描电子显微镜(SEM)、X射线衍射(XRD)等测试方法,对样品的结构和形貌进行了表征。为了提高TiO_2微球电池的光电性能,利用TiO_2微球作为反射层构造了双层结构的薄膜电极,结果表明,双层结构染料敏化太阳能电池在100 m W·cm-2(1.5 G)光照条件下,短路光电流Jsc=17.64 m A·cm-2,开路光电压Voc=0.74 V,填充因子FF=0.63和光电转化效率η=8.33%。相比TiO_2微球制备的太阳能电池,双层结构染料敏化太阳能电池光电转化效率提高至5.3倍。最后对电极中染料的吸附量、电极的光散射性能和电池的电化学阻抗做了进一步研究和分析,研究表明,双层结构电池增强光的捕获能力,从而提高光伏性能。
