The relationship between particle size and catalytic activity of gold nanoparticle catalysts with γ-Al2O3 as support has been investigated. The catalysts were prepared via the gold sol with different particle sizes b...The relationship between particle size and catalytic activity of gold nanoparticle catalysts with γ-Al2O3 as support has been investigated. The catalysts were prepared via the gold sol with different particle sizes by micelle method, and their structures were characterized by HRTEM and XRD, respectively. Furthermore, the catalytic activities were tested by CO oxidation. Experimental results showed that the catalytic activity became much weaker when gold particles were increased from 3.2 to 6.6 nm. Additionally, the particle size was also a key factor to govern catalytic activity with regard to gold supported on TiO2 prepared by the methods of deposition-precipitation.展开更多
利用溶胶-凝胶法及光沉积法制备纳米金-钛酸锌（Nano Au-Zn Ti O_3）复合等离子光催化剂。采用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、紫外可见漫反射光谱、荧光光谱、光电流密度、光催化制氢性能等技术手段和测试表征了...利用溶胶-凝胶法及光沉积法制备纳米金-钛酸锌（Nano Au-Zn Ti O_3）复合等离子光催化剂。采用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、紫外可见漫反射光谱、荧光光谱、光电流密度、光催化制氢性能等技术手段和测试表征了样品的结构及性能。结果表明,Zn Ti O_3在900℃煅烧下呈立方相和六角相的混合相,其形貌呈近似球形,粒径约为50～100 nm。由于纳米金（Nano Au）的表面等离子共振效应,Nano Au-Zn Ti O_3复合材料在可见光区有较强的吸收,吸收峰位于525 nm处。Nano Au-Zn Ti O_3复合等离子光催化剂在可见光激发下呈现出优良的光催化分解水制氢活性。展开更多
基金Project supported by the National Natural Science Foundation of China （No.50121202）.
文摘The relationship between particle size and catalytic activity of gold nanoparticle catalysts with γ-Al2O3 as support has been investigated. The catalysts were prepared via the gold sol with different particle sizes by micelle method, and their structures were characterized by HRTEM and XRD, respectively. Furthermore, the catalytic activities were tested by CO oxidation. Experimental results showed that the catalytic activity became much weaker when gold particles were increased from 3.2 to 6.6 nm. Additionally, the particle size was also a key factor to govern catalytic activity with regard to gold supported on TiO2 prepared by the methods of deposition-precipitation.
文摘采用硼氢化钠还原金盐溶液,制备了晶粒尺寸为5 nm的金溶胶,以静电吸附的方法将Au纳米晶均匀地沉积在FTO玻璃基全纳米颗粒组装的SnO2/TiO2薄膜内,用SEM、EDS、TEM、光电流密度等方法对金修饰的全纳米颗粒组装SnO2/TiO2薄膜(Au-SnO2/TiO2)进行了表征。金纳米晶修饰后,光电流密度较相同厚度的SnO2/TiO2薄膜提高了128.3%,更加有利于光生电子的迁移。将Au-SnO2/TiO2薄膜用作染料敏化太阳能电池(Dye-sensitized solar cells,DSSCs)的阻挡层后,发现复合薄膜有效地阻止了导电玻璃基底上光生电子与电解液中I-3的复合,提高了DSSCs的光电转换效率。不同厚度的Au-SnO2/TiO2阻挡层复合薄膜中,含6层Au-SnO2/TiO2复合薄膜阻挡层的DSSCs最终效率为7.12%,较常用的Ti Cl4稀溶液预处理FTO玻璃的工艺(6.06%)提高了17.5%。
文摘利用溶胶-凝胶法及光沉积法制备纳米金-钛酸锌（Nano Au-Zn Ti O_3）复合等离子光催化剂。采用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、紫外可见漫反射光谱、荧光光谱、光电流密度、光催化制氢性能等技术手段和测试表征了样品的结构及性能。结果表明,Zn Ti O_3在900℃煅烧下呈立方相和六角相的混合相,其形貌呈近似球形,粒径约为50～100 nm。由于纳米金（Nano Au）的表面等离子共振效应,Nano Au-Zn Ti O_3复合材料在可见光区有较强的吸收,吸收峰位于525 nm处。Nano Au-Zn Ti O_3复合等离子光催化剂在可见光激发下呈现出优良的光催化分解水制氢活性。
