一步法构建S型BaTi2O5/g-C3N4异质结用于增强光催化析氢
One-step direct construction of S-scheme BaTi205/g-C3N4 heterojunction for enhanced photocatalytic hydrogen evolution
李亚莹 1杨惠娟 1李吉利 2李晔飞 2任伟 3闻瑾 1肖琪 1许景三4
作者信息
- 1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China
- 2. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials,Fudan University,Shanghai 200433,China
- 3. Physics Department,Shanghai Key Laboratory of High Temperature Superconductors,and International Center of Quantum and Molecular Structures,Materials Genome Institute,and State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China
- 4. School of Chemistry and Physics & Centre for Materials Science,Queensland University of Technology,Brisbane,QLD 4001,Australia
- 折叠
摘要
作为一种将太阳能有效转化为化学物质的方法,异质结光催化已被广泛研究.然而,开发高性能异质结光催化系统的主要挑战在于实现各组分之间电子的高效转移.本文通过将BaTi2O5纳米棒与g-C3N4薄片相结合,构建了一种新型S型异质结光催化剂.通过一步浸渍-还原法在g-C3N4纳米片上优先沉积Pt纳米颗粒作为助催化剂,增强了界面接触和强电子相互作用,这对光催化性能的提升至关重要.实验结果显示,所构建的PtImp/20BaTi2O5/g-C3N4光催化剂的最佳析氢速率为2587 μmol g-1 h-1,并且在循环后依旧保持较高的稳定性.光电化学分析和理论计算进一步表明,BaTi2O5/g-C3N4异质结的构建导致了交错能带排列的形成和电荷载流子动力学的改善.这项工作凸显了利用新型S型异质结和可行的助催化剂促进光催化发展的重要性和可行性.
Abstract
Heterojunction photocatalysis has been widely studied as a means of efficiently converting solar energy to chemicals.However,the major challenge in developing high-performing heterojunction photocatalytic systems lies in achieving efficient transfer of electrons between the compo-nents.Herein,a novel S-scheme heterojunction photocatalyst was developed by combining BaTi2O5 nanorods with g-C3N4 lamellae.The preferential deposition of Pt nanoparticles as cocatalyst via the one-step impregnation-reduction method on g-C3N4 nanosheets with enhanced interfacial contact and strong electronic interaction has been proved essential for the photocatalytic performance.The developed Ptimp/20BaTi2O5/g-C3N4 photocatalyst delivers the optimal hydrogen produc-tion rate of 2587 μmol g-1 h-1 with high stability after cycles.Photoelectrochemical analysis and theoretical calculation suggest that the formation of BaTi2O5/g-C3N4 heterojunction results in the staggered band alignment and improved charge carrier dynamics.This work highlights the importance and feasibility of promoting photocatalysis by a new S-scheme heterojunction with viable cocatalysts.
关键词
BaTi2O5/g-C3N4/S-scheme heterojunction/cocata-lyst/charge carrier dynamics/photocatalytic H2 evolutionKey words
BaTi2O5/g-C3N4/S-scheme heterojunction/cocata-lyst/charge carrier dynamics/photocatalytic H2 evolution引用本文复制引用
基金项目
Shanghai Pujiang Program(21PJ1400400)
Shanghai Municipal Science and Technology Commission(22511103900)
Fundamental Research Funds for the Central Universities(2232023A-02)
National Natural Science Foundation of China(22173017)
出版年
2024
NETL
NSTL
万方数据