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    陈硕

    • 教授   博士生导师   硕士生导师
    • 主要任职:无
    • 性别:女
    • 毕业院校:大连理工大学
    • 学位:博士
    • 在职信息:在职
    • 所在单位:环境学院
    • 学科:环境工程 环境科学
    • 办公地点:大连理工大学环境学院B717
    • 联系方式:0411-84706263
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    Nanoscale lightning rod effect in 3D carbon nitride nanoneedle: Enhanced charge collection and separation for efficient photocatalysis

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    论文类型:期刊论文

    第一作者:Zeng, Zhenxing

    通讯作者:Quan, X (reprint author), Dalian Univ Technol, Sch Environm Sci & Technol, Minist Educ, Key Lab Ind Ecol & Environm Engn, Dalian 116024, Peoples R China.

    合写作者:Quan, Xie,Yu, Hongtao,Chen, Shuo,Zhang, Shushen

    发表时间:2019-07-01

    发表刊物:JOURNAL OF CATALYSIS

    收录刊物:SCIE、EI

    卷号:375

    页面范围:361-370

    ISSN号:0021-9517

    关键字:Lightning rod effect; Carbon nitride nanoneedle; Photocatalysis; Hydrogen evolution; Hydrogen peroxide generation

    摘要:Polymeric materials are promising photocatalysts for clean energy (e.g. hydrogen) production, however their catalytic performances are largely restricted to the low charge mobility and sluggish electron-hole separation efficiency. Herein, we propose a novel three dimensional (3D) branched carbon nitride integrated by one dimensional (1D) nanoneedles (3DBC-C3N4-N) to overcome this obstacle. We verify that the integrated crystalline nanoneedles with high curvature tips could induce a "lightning rod effect" property to accelerate charge transfer and separation by guiding electron migration along the sharp tip direction. Both 3D finite-difference time-domain (FDTD) calculation and experimental results reveal that the high curvature crystalline tip can intensify the local electric intensity by concentrating the photogenerated electrons around the tip area, therefore significantly enhance electron-hole separation. As a result, the 3DBC-C3N4-N exhibits excellent visible light (lambda > 420 nm) photocatalytic H2O2 production as well as H2 evolution performance with obvious bubbles bubble out from the surface of catalyst and a notable apparent quantum efficiency (AQE) of 26% at 420 nm, higher than most reported polymeric materials. The innovative "lightning rod effect" strategy described here shows great potential to manipulate charge transfer and separation process for achieving efficient solar energy conversion. (C) 2019 Elsevier Inc. All rights reserved.