论文成果
Construction of intramolecular donor-acceptor type carbon nitride for photocatalytic hydrogen production
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关键字:TRANSITION; WATER; RING
摘要:High-efficiency photocatalysts based on organic polymeric semiconductor are often limited by slow charge separation kinetics and sluggish redox reaction dynamics. Herein, the donor-acceptor conjugated polymeric carbon nitride (D/A-CN) was synthesized by grafting benzene ring and pyridine moiety into the backbone of CN through a flexible pyrolysis strategy. The D/A-CN shows a high photocatalytic H2 evolution rate of 4795 mu mol & sdot;h- 1 & sdot;g- 1, which is approximate to 6.08 times higher than that of pristine CN (787.5 mu mol & sdot;h- 1 & sdot;g- 1). Both experimental and theoretical results confirm that the robust internal electric field is established in the D/A-CN framework due to the enhanced molecular dipole, which apply a kinetic force to facilitate the separation and mobility of photogenerated carriers. Meanwhile, the deeper conduction band potential caused by the elevated orbital energy level of D/A-CN contributes to the enhanced reduction ability of photoinduced electron. Consequently, the faster carrier transfer kinetics and the stronger thermodynamic reduction driving force synergistically lead to efficient photocatalytic H2 production of D/A-CN. This work reinforces the comprehension of the structure-performance relationship of donor-acceptor structural photocatalysts and provides an insight for enhancing the photocatalytic activity of polymeric photocatalysts at the molecular level.
卷号:655
期号:
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李桂村

教授 博士生导师 硕士生导师

教师拼音名称:liguicun

出生日期:1974-05-12

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所在单位:材料学院综合办公室

职务:材料科学与工程学院院长

学历:博士研究生

办公地点:材料楼225房间

性别:男

联系方式:guicunli@qust.edu.cn Tel:13730918070

学位:工学博士

毕业院校:中国海洋大学

所属院系:材料科学与工程学院

学科:材料物理与化学

曾获荣誉:

2016-01-01    山东省有突出贡献的中青年专家

2012-11-07    山东省第三届优秀研究生指导教师

2011-04-01    青岛拔尖人才

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