Drastic Layer-Number-Dependent Activity Enhancement in Photocatalytic H2Evolution overnMoS2/CdS (n≥ 1) Under Visible Light

2015 ◽  
Vol 5 (10) ◽  
pp. 1402279 ◽  
Author(s):  
Kun Chang ◽  
Mu Li ◽  
Tao Wang ◽  
Shuxin Ouyang ◽  
Peng Li ◽  
...  
Keyword(s):  
Visible Light ◽  
Layer Number ◽  
Dependent Activity ◽  
Activity Enhancement

Synergistic effects of Fe and graphene on photocatalytic activity enhancement of TiO2 under visible light

2012 ◽  
Vol 258 (15) ◽  
pp. 5827-5834 ◽  
Author(s):  
N.R. Khalid ◽  
Zhanglian Hong ◽  
E. Ahmed ◽  
Yuewei Zhang ◽  
He Chan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Synergistic Effects ◽  
Activity Enhancement

scholarly journals Construction of K+ ions gradient in crystalline carbon nitride to accelerate charge separation for efficient visible light H2 production

2021 ◽  
Author(s):  
Guoqiang Zhang ◽  
Yangsen Xu ◽  
Chuan-Xin He ◽  
Yongliang Li ◽  
Xiangzhong Ren ◽  
...  
Keyword(s):  
Visible Light ◽  
Driving Force ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
H2 Production ◽  
H2 Evolution ◽  
Concentration Gradients ◽  
Diffusion Controlled ◽  
Activity Enhancement ◽  
First Time

Abstract Like most of the recent reported semiconductor photocatalysts, the sluggish dynamic charges transfer and separation caused by weak driving force still restricts the further improvement of photocatalytic performance in crystalline carbon nitride (CCN). Here, we successfully prepared a series of heptazine-based K+ implanted CCN (KCN) for the first time, where the K+ ions concentration was gradiently inserted through controlling its diffusion from the surface to bulk in carbon nitride (CN). As a powerful driving force, the built-in electric field (BIEF) induced by this concentration gradient, greatly accelerates the drift movement and the transport from bulk to the surface, as well as the separation of photogenerated carriers. Consequently, the KCN with optimized BIEF displays a ～34 times promotion than original CN for visible-light H2 evolution. Such a high activity enhancement factor is at a relatively good level in reported CCN. Our proposed strategy to induce BIEF production by constructing concentration gradients through thermodynamically feasible diffusion controlled solid-state reaction, can be adopted to build other efficient photocatalytic systems.

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