Phosphorus and sulphur co-doping of g-C3N4 nanotubes with tunable architectures for superior photocatalytic H-2 evolution
Phosphorus and sulphur co-doping of g-C3N4 nanotubes with tunable architectures for superior photocatalytic H-2 evolution
复制标题
具有可调结构的 g-C3N4 纳米管的磷和硫共掺杂可实现卓越的光催化 H-2 析出
DOI：
10.1016/j.ijhydene.2019.06.037
复制
发表时间：
2019
影响因子：
7.2
通讯作者：
Yang Ping
中科院分区：
文献类型：
--
作者：
Liu Zhiguo;Zhang Xiao;Jiang Zhixiang;Chen Hsueh Shih;Yang Ping
非金属掺杂不仅优化了g-C3N4的能带结构，提高了对可见光的吸收，而且加剧了最低和最高未占分子轨道面的畸变，引起偏振，从而提高了光催化活性。首次将S和P共同引入g-C3N4网络中，以增强光催化性能并产生各种管状形态。 S与P的比例对于控制管状形态和性能至关重要。在光催化过程中，S和P元素的极化引起电子和空穴的分离以及管状形貌的协同作用，为光生电子和空穴提供了新的迁移路径。使用优化的制备条件，共掺杂S和P（CNSP）的g-C3N4管表现出非常高的产氢效率（163.27 μmol/h），比纯g-C3N4高两个数量级，表观量子产率在420 nm处为18.93%。在可见光照射下，使用 CNSP 可以在 5 分钟内快速降解罗丹明 B。由于过程可重复，该合成策略为控制具有超活性的g-C3N4基材料的形貌提供了一种新方法。
Non-metal doping not only optimizes the energy band structure of g-C3N4to improve the absorption of visible light, but also exacerbates the distortion of lowest and highest unoccupied molecular orbital plane, causing polarization, thereby improving photocatalytic activity. For the first time, S and P are co-introduced into g-C3N4network to enhance photocatalytic performance and create various tubular morphologies. The ratio of S to P is crucial to control the tubular morphology and property. In the photocatalytic process, the separation of electrons and holes causes by the polarization of the S and P elements and the synergy of the tubular morphology results in new migration paths for photogenerated electrons and holes. Using optimized preparation conditions, g-C3N4tubes co-doped with S and P (CNSP) reveal very high H2generation efficiency (163.27 μmol/h), which is two orders of magnitude higher compared to that of pure g-C3N4and apparent quantum yield is 18.93% at 420 nm. Fast degradation of Rhodamine B by using CNSP occurs within 5 min under visible light irradiation. Because of the reproducible process, the synthetic strategy provides a novel method for controlling the morphology of g-C3N4-based materials with super activity.