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Enhanced full-spectrum photocatalytic activity of 3D carbon-coated C3N4 nanowires via giant interfacial electric field
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2022-08-08 , DOI: 10.1016/j.apcatb.2022.121829
Yajun Wang , Mengmeng Liu , Fan Fan , Gang Li , Jianxia Duan , Yuming Li , Guiyuan Jiang , Wenqing Yao

Strong interfacial electric field can promote the separation and transfer of photogenerated carriers of photocatalysts. Herein, a three-dimensional (3D) network structure assembled from carbon-coated C3N4 nanowires (denoted as 3D C3N4@C) with a giant interfacial electric field was prepared. The unique 3D structure works with the carbon layer to expand the light absorption range of C3N4 to the full spectrum. Under visible-light irradiation (λ ≥ 420 nm), the degradation rate constants of 3D C3N4@C for bisphenol A and phenol were 41.2 and 5.7 times that of bulk g-C3N4, respectively. Meanwhile, the interfacial electric field of 3D C3N4@C-2 mol/L was 5.14 times that of bulk g-C3N4. The charge transfer process of 3D C3N4@C was confirmed by synchronous illumination X-ray photoelectron spectroscopy and DFT. The significantly improved activity was mainly ascribed to the giant interfacial electric field between g-C3N4 and the carbon layer, which significantly promoted the separation and transportation of photo-generated charge carriers.



中文翻译:

通过巨大的界面电场增强 3D 碳包覆 C3N4 纳米线的全光谱光催化活性

强界面电场可以促进光催化剂光生载流子的分离和转移。在此,制备了由具有巨大界面电场的碳涂层C 3 N 4纳米线(表示为3D C 3 N 4 @C)组装而成的三维(3D)网络结构。独特的 3D 结构与碳层一起将 C 3 N 4的光吸收范围扩大到全光谱。在可见光照射下(λ≥420 nm),3D C 3 N 4 @C对双酚A和苯酚的降解速率常数分别是体gC 3 N 4的41.2和5.7倍, 分别。同时,3D C 3 N 4 @C-2 mol/L的界面电场是体gC 3 N 4的5.14倍。通过同步照射X射线光电子能谱和DFT证实了3D C 3 N 4 @C的电荷转移过程。显着提高的活性主要归因于gC 3 N 4与碳层之间的巨大界面电场,显着促进了光生电荷载流子的分离和传输。

更新日期:2022-08-11
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