Construction of K+ Ion Gradient in Crystalline Carbon Nitride to Accelerate Exciton Dissociation and Charge Separation for Visible Light H2 Production

ACS Catalysis ◽  
2021 ◽  
pp. 6995-7005
Author(s):  
Guoqiang Zhang ◽  
Yangsen Xu ◽  
Dafeng Yan ◽  
Chuanxin He ◽  
Yongliang Li ◽  
...  
Keyword(s):  
Visible Light ◽  
Charge Separation ◽  
Carbon Nitride ◽  
H2 Production ◽  
Exciton Dissociation ◽  
Ion Gradient

scholarly journals Enhanced charge separation and transport efficiency induced by vertical slices on the surface of carbon nitride for visible-light-driven hydrogen evolution

RSC Advances ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 4404-4414 ◽  
Author(s):  
Qian Yang ◽  
Zehao Li ◽  
ChengCheng Chen ◽  
Zhengguo Zhang ◽  
Xiaoming Fang
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Charge Separation ◽  
Carbon Nitride ◽  
Post Treatment ◽  
Transport Efficiency ◽  
Visible Light Driven

A hierarchical g-C3N4 structure with vertical slices and enhanced efficiency of charge separation is achieved via an NH4NO3-aided hydrothermal post-treatment.

Porous P-doped graphitic carbon nitride nanosheets for synergistically enhanced visible-light photocatalytic H2 production

2015 ◽  
Vol 8 (12) ◽  
pp. 3708-3717 ◽  
Author(s):  
Jingrun Ran ◽  
Tian Yi Ma ◽  
Guoping Gao ◽  
Xi-Wen Du ◽  
Shi Zhang Qiao
Keyword(s):  
Visible Light ◽  
Quantum Efficiency ◽  
Carbon Nitride ◽  
H2 Production ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Production Activity ◽  
Carbon Nitride Nanosheets ◽  
Visible Light Photocatalytic

Porous P-doped g-C3N4 nanosheets prepared by combining P doping and thermal exfoliation exhibit a high visible-light photocatalytic H2-production activity of 1596 μmol h−1 g−1 and a quantum efficiency of 3.56% at 420 nm.

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.

Construction of Spatial Charge Separation Facets on BaTaO2N Crystals by Flux Growth Approach for Visible-Light-Driven H2 Production

2019 ◽  
Vol 11 (25) ◽  
pp. 22264-22271 ◽  
Author(s):  
Ying Luo ◽  
Sayaka Suzuki ◽  
Zheng Wang ◽  
Kunio Yubuta ◽  
Junie Jhon M. Vequizo ◽  
...  
Keyword(s):  
Visible Light ◽  
Charge Separation ◽  
H2 Production ◽  
Flux Growth ◽  
Spatial Charge ◽  
Visible Light Driven ◽  
Growth Approach
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