Facile one-pot synthesis of mesoporous g-C3N4 nanosheets with simultaneous iodine doping and N-vacancies for efficient visible-light-driven H2 evolution performance,Catalysis Science & Technology

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Facile one-pot synthesis of mesoporous g-C3N4 nanosheets with simultaneous iodine doping and N-vacancies for efficient visible-light-driven H2 evolution performance
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2019/12/12 , DOI: 10.1039/c9cy02111f
Waheed Iqbal _{1,

2,

3,

4,

5} , Bo Yang _{1,

2,

3,

4} , Xu Zhao _{6,

7,

8,

9,

10} , Muhammad Rauf _{1,

2,

3,

4} , Ibrahim M. A. Mohamed _{1,

2,

3,

4} , Jinlong Zhang _{4,

5,

11,

12,

13} , Yanping Mao _{1,

2,

3,

4}

Affiliation

Direct and efficient visible-light water splitting by photocatalysis is essential for the sustainable conversion of solar energy into H₂ fuel. In this study, mesoporous nanostructured g-C₃N₄ with simultaneously incorporated N-vacancies and iodine dopant was prepared by a straightforward one-step approach. The simultaneous thermolysis of glucose and NH₄I resulted in several phenomena, including (i) synergistic exfoliation of iodine doped mesoporous g-C₃N₄, (ii) introduction of N-vacancies due to the release of more nitrogen-rich dynamic gases, and (iii) extended visible light absorption due to the strategic band positions of midgap states below the conduction band, which functions as an efficient reservoir to temporarily trap the radiative electrons in the modified g-C₃N₄. As a result, the as-synthesized iodine doped mesoporous g-C₃N₄ demonstrated an outstanding photocatalytic H₂ evolution performance of 7819.2 μmol h⁻¹ g⁻¹ under simulated solar light irradiation, which was nearly 6.5 folds higher than that of the bulk g-C₃N₄ and other typical doped g-C₃N₄ photocatalysts. Our work proposed a simple and scalable route to synthesize high-performance metal-free g-C₃N₄ photocatalysts by changing the electron transition via rational band structure engineering.

中文翻译：

方便的一锅法合成中孔g-C3N4纳米片，同时进行碘掺杂和N空位，以实现有效的可见光驱动的H2析出性能

通过光催化直接有效地分解可见光水对于将太阳能可持续转化为H ₂燃料至关重要。在这项研究中，通过直接的一步法制备了同时掺入N空位和碘掺杂剂的中孔纳米结构gC ₃ N ₄。葡萄糖和NH ₄ I的同时热解导致多种现象，包括（i）碘掺杂的介孔gC ₃ N _4的协同剥离。，（ii）由于释放出更多的富氮动态气体而引入了N空位，并且（iii）由于中能带态在导带以下的战略能带位置而扩大了可见光吸收，从而有效地存储了暂时将辐射电子捕获在改性gC ₃ N _4中。结果，合成的碘掺杂的介孔gC ₃ N ₄在模拟的太阳光照射下表现出出色的光催化H ₂析出性能，为7819.2μmolh ^-1 g ^-1，比本体gC高近6.5倍₃ N ₄和其他典型的掺杂gC₃ N₄光催化剂。我们的工作提出了一种简单且可扩展的途径，通过通过合理的能带结构工程改变电子跃迁来合成高性能的不含金属的gC₃ N₄光催化剂。

更新日期：2020-02-13

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