首页|Enhanced visible-light photocatalytic hydrogen evolution using two-dimensional carbon nitride sheets with the removal of amine groups

Enhanced visible-light photocatalytic hydrogen evolution using two-dimensional carbon nitride sheets with the removal of amine groups

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Two-dimensional(2D)carbon nitride sheets(CNs)with atomically thin structures are regarded as one of the most promising materials for solar energy conversion.However,due to their substantially en-larged bandgap caused by the strong quantum size effect and their incomplete polymerisation with a large number of non-condensed surface amino groups,the practical applicability of CNs in photocatalysis is limited.In this study,CNs with broad visible-light absorption were synthesised using a 5-min fast ther-mal annealing.The removal of uncondensed amine groups reduces the bandgap of CNs from 3.06 eV to 2.60 eV,increasing their absorption of visible light.Interestingly,the CNs were distorted after annealing,which can differentiate the spatial positions of electrons and holes,enhancing the visible-light absorption efficiency.As a result,when exposed to visible light,the photocatalytic hydrogen production activity of atomically thin 2D CNs rose by 8.38 times.This research presents a dependable and speedy method for creating highly effective visible-light photocatalysts with narrowed bandgaps and improved visible-light absorption.

2D carbon nitride sheetsRapid thermal annealingDFT calculationsVisible-light absorptionvisible-light photocatalysis

Yu Zhang、Liting Wu、Shaopeng Wang、Dingyi Yang、Huan Liang、Yizhang Wu、Jian Hao、Youqing Wang、Jianke Liu、Yong Wang

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Department of Physics,Shaanxi University of Science and Technology,Xi'an 710021,China

School of Advanced Materials and Nanotechnology,Academy of Advanced Interdisciplinary Research,Xidian University,Xi'an 710126,China

Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructures,Nanjing University,Nanjing 210093,China

State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering,Ningxia University,Yinchuan 750021,China

The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology,Xidian University,Xi'an 710126,China

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国家自然科学基金国家自然科学基金中央高校基本科研业务费专项中央高校基本科研业务费专项Foundation of State Key Laboratory of Highefficiency Utilization of Coal and Green Chemical Engineering陕西省自然科学基金陕西省自然科学基金

1210435212204294XJS2122082020BJ-562022-K672019JCW-172020JCW-15

2024

10.1016/j.cclet.2023.108551

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(2)
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