Thickness-ultrathin and bismuth-rich strategies for BiOBr to enhance photoreduction of CO2 into solar fuels
Thickness-ultrathin and bismuth-rich strategies for BiOBr to enhance photoreduction of CO2 into solar fuels
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BiOBr 的厚度超薄和富铋策略可增强 CO2 光还原成太阳能燃料的能力
DOI：
10.1016/j.apcatb.2016.01.044
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发表时间：
2016-06
期刊：
影响因子：
--
通讯作者：
Po Keung Wong
中科院分区：
文献类型：
--
作者：
Liqun Ye;Xiaoli Jin;Chuan Liu;Chenghua Ding;Haiquan Xie;Ka Him Chu;Po Keung Wong
二维层状BiOX（X = Cl，Br，I）半导体纳米材料是一类重要的光催化剂。我们以前的工作表明，厚度增加和铋丰富的策略是很好的方法，以提高可见光驱动（VLD）的BiOX光催化还原活性。本研究采用甘油前驱体法制备了Bi_4O_5Br_2纳米片组装微球，并通过X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电镜（SEM）、能谱仪（EDS）等手段对其进行了表征，高分辨率透射电子显微镜（HRTEM），时间分辨PL光谱和紫外-可见漫反射光谱（DRS）。Bi_4O_5Br_2O_3纳米片的厚度约为3.7 nm，比普通BiOBr纳米片（65 nm）薄得多。在可见光照射下，由于采用了厚膜和富铋策略，合成的Bi 4 O 5 Br 2样品表现出比BiOBr和BiOBr更高的CO2光催化还原活性。更重要的是，我们发现，厚度的优势和铋丰富的战略发挥了不同的作用。对于CO2的光还原反应，浓度-浓度策略只能增加CO的生成，而富铋策略只能增加CH 4的生成。
Two dimension layered BiOX (X = Cl, Br, I) semiconductor nanomaterials are very important photocatalysts. Our previous work showed that thickness-ultrathin and bismuth-rich strategies are excellent methods to improve the visible-light-driven (VLD) photocatalytic reduction activity of BiOX. In this study, thickness-ultrathin and bismuth-rich strategies were ingenuously combined to enhance the photocatalytic performance of the photocatalyst, via a glycerol precursor route, Bi4O5Br2microsphere assembled by ultrathin nanosheets was synthesized and characterized by X-ray diffraction (XRD) patterns, X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), high-resolution transmission electron microscopy (HRTEM), time-resolved PL spectra and UV–vis diffuse reflectance spectra (DRS). The thickness of Bi4O5Br2ultrathin nanosheets was about 3.7 nm, which was much thinner than the common BiOBr nanosheets (65 nm). Due to the thickness-ultrathin and bismuth-rich strategies, the synthesized Bi4O5Br2sample displayed a higher photocatalytic reduction activity of CO2conversion than BiOBr and ultrathin BiOBr under visible-light irradiation. More importantly, we found that thickness-ultrathin and bismuth-rich strategies played different roles. Thickness-ultrathin strategy only can increase the CO generation while bismuth-rich strategy only can increase the CH4generation for photoreduction of CO2.
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作者：
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