Feng Haifeng, Xu Zhongfei, Wang Liang, Yu Youxing, Mitchell David, Cui Dandan, Xu Xun, Shi Ji, Sannomiya Takumi, Du Yi, Hao Weichang, Dou Shi Xue
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology , Tokyo 152-8552, Japan.
ACS Appl Mater Interfaces. 2015 Dec 23;7(50):27592-6. doi: 10.1021/acsami.5b08904. Epub 2015 Dec 9.
BiOBr nanosheets with highly reactive {001} facets exposed were selectively synthesized by a facile hydrothermal method. The inner strain in the BiOBr nanosheets has been tuned continuously by the pH value. The photocatalytic performance of BiOBr in dye degradation can be manipulated by the strain effect. The low-strain BiOBr nanosheets show improved photocatalytic activity. Density functional calculations suggest that strain can modify the band structure and symmetry in BiOBr. The enhanced photocatalytic activity in low-strain BiOBr nanosheets is due to improved charge separation attributable to a highly dispersive band structure with an indirect band gap.
通过一种简便的水热法选择性地合成了暴露有高反应活性{001}晶面的溴氧化铋纳米片。溴氧化铋纳米片内部的应变已通过pH值进行了连续调节。溴氧化铋在染料降解中的光催化性能可通过应变效应进行调控。低应变的溴氧化铋纳米片表现出更高的光催化活性。密度泛函计算表明，应变可改变溴氧化铋的能带结构和对称性。低应变溴氧化铋纳米片中光催化活性的增强归因于电荷分离的改善，这是由于具有间接带隙的高度分散能带结构所致。
