Shi Li, Yang Liuqing, Zhou Wei, Liu Yanyu, Yin Lisha, Hai Xiao, Song Hui, Ye Jinhua
Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, 060-0814, Japan.
International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
Small. 2018 Mar;14(9). doi: 10.1002/smll.201703142. Epub 2018 Jan 10.
Holey defective g-C N 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-C N 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-C N , 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-C N photocatalysts show much higher photocatalytic activity for H O production with optimized enhancement up to ten times higher than pristine bulk g-C N . 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.
据报道，通过一种新型光辅助加热工艺可轻松制备出多孔缺陷型g-CN光催化剂。光辅助处理不仅有助于产生大量空穴，使g-CN具有更多暴露的催化活性位点和跨平面扩散通道，从而缩短反应物从表面到本体以及电荷载流子从本体到表面的扩散距离，而且还会在g-CN的三嗪重复单元中引入氮空位，导致本征带隙变窄并在带隙内形成缺陷态，从而扩展可见光吸收范围并抑制辐射性电子-空穴复合。结果，多孔缺陷型g-CN光催化剂对H2O生成表现出更高的光催化活性，优化后的增强效果比原始块状g-CN高出十倍。这里采用的新开发合成策略能够充分利用太阳能，并且在用于高效能源相关应用的其他材料改性方面显示出相当大的前景。
