Bi2MoO6纳米片/TiO2纳米棒阵列复合材料的制备及其可见光响应光电催化性能研究

Novel Bi₂MoO₆/TiO₂ heterojunction was fabricated by growing Bi₂MoO₆ nanosheets arrays on the vertically aligned TiO₂ nanorods arrays via a two-step solvothermal method. The obtained Bi₂MoO₆/TiO₂ hierarchical heterojunction showed excellent visible light photoelectrochemical performance. Compared with the pure TiO₂ and Bi₂MoO₆, the photocurrent density of the heterojunction was increased 57 and 29 times, respectively. Furthermore, the hydrogen generation rate of the Bi₂MoO₆/TiO₂ for photoelectrocatalytic water-splitting was about 6 times higher than that of the pure Bi₂MoO₆. The improved performance can be attributed to the synergistic effects of enhanced absorption of visible light, increase of migration rate and separation efficiency of photo-induced carriers.     

直接Z型CdO-CdS纳米棒阵列的制备及其光电催化性能研究

本文通过简单的水热法制备了一种CdO-CdS一维纳米棒阵列，并系统地研究了材料的结构、形貌及其光电化学性质和产氢活性. 所得纳米棒为直径100至200 nm的六方柱. 通过优化煅烧温度和时间得到了该实验条件下光电催化性能最优的样品. 在0 V vs. Ag/AgCl偏压下，CdO-CdS光电流密度为6.5 mA/cm²，光电催化产氢活性为240 μmol·cm^-2·h^-1，几乎是纯CdS的2倍. 该体系的光电催化性能超过了许多已报道的相似体系. 根据材料结构和光电化学性能表征结果，提出了直接z型光催化机理，该机理可以很好地解释光致载流子的高分离效率和优异的氧化还原性能.