Wu Yunyan, Xiong Pan, Wu Jianchun, Huang Zengliang, Sun Jingwen, Liu Qinqin, Cheng Xiaonong, Yang Juan, Zhu Junwu, Zhou Yazhou
Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China.
School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, People's Republic of China.
Nanomicro Lett. 2021 Jan 4;13(1):48. doi: 10.1007/s40820-020-00571-6.
Graphitic carbon nitride (g-CN)-based photocatalysts have shown great potential in the splitting of water. However, the intrinsic drawbacks of g-CN, such as low surface area, poor diffusion, and charge separation efficiency, remain as the bottleneck to achieve highly efficient hydrogen evolution. Here, a hollow oxygen-incorporated g-CN nanosheet (OCN) with an improved surface area of 148.5 m g is fabricated by the multiple thermal treatments under the N/O atmosphere, wherein the C-O bonds are formed through two ways of physical adsorption and doping. The physical characterization and theoretical calculation indicate that the O-adsorption can promote the generation of defects, leading to the formation of hollow morphology, while the O-doping results in reduced band gap of g-CN. The optimized OCN shows an excellent photocatalytic hydrogen evolution activity of 3519.6 μmol g h for ~ 20 h, which is over four times higher than that of g-CN (850.1 μmol g h) and outperforms most of the reported g-CN catalysts.
基于石墨相氮化碳（g-CN）的光催化剂在水分解方面展现出了巨大潜力。然而，g-CN的固有缺陷，如低比表面积、较差的扩散性能和电荷分离效率，仍然是实现高效析氢的瓶颈。在此，通过在N/O气氛下进行多次热处理制备了一种具有148.5 m²/g改善比表面积的中空氧掺杂g-CN纳米片（OCN），其中C-O键通过物理吸附和掺杂两种方式形成。物理表征和理论计算表明，O吸附可促进缺陷的产生，导致中空形态的形成，而O掺杂导致g-CN的带隙减小。优化后的OCN在约20小时内表现出3519.6 μmol g⁻¹ h⁻¹的优异光催化析氢活性，这比g-CN（850.1 μmol g⁻¹ h⁻¹）高出四倍多，并且优于大多数已报道的g-CN催化剂。
