强化 H2O 吸附和光生载流子分离：g-C3N4 光催化剂的表面 C 耦合羟基化，实现高效产氢,Journal of Materials Chemistry A

当前位置： X-MOL 学术 › J. Mater. Chem. A › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

强化 H2O 吸附和光生载流子分离：g-C3N4 光催化剂的表面 C 耦合羟基化，实现高效产氢
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-01-30 , DOI: 10.1039/d3ta07832a
Jun Hu ₁ , Lixu Wu ₁ , Hongyin Liu ₁ , Chun Sun ₁ , Syed Aamir Hussain ₁ , Fei-peng Jiao ₁ , Yaochi Liu ₁

Affiliation

基于光催化的gC ₃ N ₄系统是一种绿色环保的制氢方法，但gC ₃ N ₄的有限活性是不希望的。目前，大多数gC ₃ N ₄基光催化体系的改性策略都集中在体相外的掺杂和异质结工程，而很少考虑体相内的官能团改性。在此，提出了用于有效产生H ₂的表面C耦合羟基化gC ₃ N _{4光催化剂。}_{提出了通过甲醛与gC 3} N ₄骨架中的不饱和碳反应的C耦合羟基化过程。_{与原始gC 3} N ₄光催化剂相比，表面C耦合羟基化gC ₃ N _{4光催化剂的H}₂生产光催化效率高出11.18倍以上，并且具有令人印象深刻的表观量子产率。_{实验结果和理论计算表明，在gC 3} N ₄表面引入C耦合羟基化后，形貌、光响应特征和晶体结构得以保持，但gC的H ₂ O吸附和H ₂生产效率下降。由于优异的光致载流子迁移效率，₃ N _{4显着增加。}因此，利用C偶联羟基化对gC ₃ N ₄光催化剂进行功能改性是非常有利的。这项工作可以为从结构修饰的角度设计高效功能光催化剂提供一种新的有用的方案。

"点击查看英文标题和摘要"

Strengthened H2O adsorption and photogenerated carrier separation: surface C-coupled hydroxylation of g-C3N4 photocatalysts for efficient H2 production

A photocatalysis based g-C₃N₄ system is a green and eco-friendly method for hydrogen production, but limited activity of g-C₃N₄ is undesirable. Presently, most of the modification strategies for the g-C₃N₄-based photocatalytic system are centered on doping and heterojunction engineering outside the bulk phase, and little consideration is given to functional group modification within the bulk phase. Herein, surface C-coupled hydroxylated g-C₃N₄ photocatalysts for efficient H₂ evolution are presented. A C-coupled hydroxylation process is proposed through the reaction of formaldehyde with the unsaturated carbon in the g-C₃N₄ framework. Compared to pristine g-C₃N₄ photocatalysts, the surface C-coupled hydroxylated g-C₃N₄ photocatalyst exhibited over 11.18 times more photocatalytic efficiency for H₂ production, and impressive apparent quantum yield. The experimental findings and theoretical calculations reveal that the morphology, photo-response features, and crystal structure are maintained after the introduction of C-coupled hydroxylation on the g-C₃N₄ surface, but the H₂O adsorption and H₂ production efficiency of g-C₃N₄ are significantly increased due to excellent photoinduced carrier migration efficiency. Therefore, the functional modification of g-C₃N₄ photocatalysts with C-coupled hydroxylation is highly favorable. This work could offer a new and useful protocol for designing highly efficient functional photocatalysts from a structural modification perspective.

更新日期：2024-01-30

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南