Photoassisted Construction of Holey Defective g‐C3N4 Photocatalysts for Efficient Visible‐Light‐Driven H2O2 Production,Small

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Photoassisted Construction of Holey Defective g‐C3N4 Photocatalysts for Efficient Visible‐Light‐Driven H2O2 Production
Small ( IF 13.0 ) Pub Date : 2018-01-10 , DOI: 10.1002/smll.201703142
Li Shi _{1,

2} , Liuqing Yang ₂ , Wei Zhou ₃ , Yanyu Liu ₃ , Lisha Yin ₂ , Xiao Hai _{1,

2} , Hui Song _{1,

2} , Jinhua Ye _{1,

2,

4,

5}

Affiliation

Holey defective g‐C₃N₄ photocatalysts, which are easily prepared via a novel photoassisted heating process, are reported. The photoassisted treatment not only helps to create abundant holes, endowing g‐C₃N₄ with more exposed catalytic active sites and crossplane diffusion channels to shorten the diffusion distance of both reactants from the surface to bulk and charge carriers from the bulk to surface, but also introduces nitrogen vacancies in the tri‐s‐triazine repeating units of g‐C₃N₄, inducing the narrowing of intrinsic bandgap and the formation of defect states within bandgap to extend the visible‐light absorption range and suppress the radiative electron–hole recombination. As a result, the holey defective g‐C₃N₄ photocatalysts show much higher photocatalytic activity for H₂O₂ production with optimized enhancement up to ten times higher than pristine bulk g‐C₃N₄. The newly developed synthetic strategy adopted here enables the sufficient utilization of solar energy and shows rather promising for the modification of other materials for efficient energy‐related applications.

中文翻译：

光辅助构建有孔缺陷的g-C3N4光催化剂，以有效地产生可见光驱动的H2O2

据报道，有孔的有缺陷的g‐C ₃ N ₄光催化剂可通过新型光辅助加热工艺轻松制备。光辅助处理不仅有助于创建大量孔，使g‐C ₃ N ₄具有更多暴露的催化活性位点和横平面扩散通道，从而缩短了两种反应物从表面到本体的扩散距离以及电荷载体从本体到表面的扩散距离，而且还会在g-C ₃ N ₄的三-三嗪重复单元中引入氮空位，导致本征带隙变窄以及带隙内缺陷态的形成，从而扩大了可见光吸收范围并抑制了辐射电子-空穴的复合。结果，有孔的有缺陷的g-C ₃ N ₄光催化剂对H ₂ O _2的生产显示出更高的光催化活性，并且优化的增强能力比原始的本体g-C ₃ N ₄高出十倍。此处采用的新开发的合成策略可以充分利用太阳能，并且在为高效能源相关应用而对其他材料进行改性方面显示出很大的希望。

更新日期：2018-01-10

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