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Enhanced photocatalytic activity induced by sp3 to sp2 transition of carbon dopants in BiOCl crystals
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2017-09-19 , DOI: 10.1016/j.apcatb.2017.09.037
Jianguo Sun , Sujuan Wu , Shi-Ze Yang , Qi Li , Jiawei Xiong , Zhenzhong Yang , Lin Gu , Xixiang Zhang , Lidong Sun

The insufficient light absorption and low quantum efficiency limit the photocatalytic performance of wide bandgap semiconductors. Here, we report a facile strategy to engineer the surface disordered defects of BiOCl nanosheets via carbon doping. The surface defects boost the light absorption and also the quantum yields, as the doped carbon atoms exhibit a transition from sp3 to sp2 hybridization at elevated temperature, corresponding to a change of assembly state from 3D cluster to 2D graphite-like structure. This transition results in an effective charge separation and thus one order of enhancement in photocatalytic activity toward phenol degradation under visible light. The current study opens an avenue to introduce sp3 to sp2 transition of carbon dopants for simultaneous increment of light absorption and quantum efficiency for application in photocatalysis and energy conversion.



中文翻译:

BiOCl晶体中碳掺杂物的sp 3到sp 2跃迁引起的增强的光催化活性

光吸收不足和量子效率低限制了宽带隙半导体的光催化性能。在这里,我们报告了一种通过碳掺杂工程化BiOCl纳米片表面无序缺陷的简便策略。由于掺杂的碳原子在升高的温度下显示出从sp 3到sp 2杂化的转变,因此表面缺陷不仅提高了光的吸收,而且还提高了量子产率,这对应于组装状态从3D簇转变为2D石墨状结构。这种转变导致有效的电荷分离,从而在可见光下对苯酚降解的光催化活性增强了一个顺序。当前的研究为将sp 3引入sp 2开辟了一条途径。 碳掺杂剂的过渡过程,以同时增加光吸收和量子效率,以用于光催化和能量转换。

更新日期:2017-09-19
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