Constructing CdSe QDs modified porous g-C3N4 heterostructures for visible light photocatalytic hydrogen production
Constructing CdSe QDs modified porous g-C3N4 heterostructures for visible light photocatalytic hydrogen production
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构建用于可见光催化制氢的 CdSe QDs 修饰多孔 g-C3N4 异质结构
DOI：
10.1016/j.jmst.2021.02.068
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发表时间：
2021
影响因子：
10.9
通讯作者：
Gang Liu
中科院分区：
文献类型：
--
作者：
Zheng Zhang;Yuyang Kang;Li-Chang Yin;Ping Niu;Chao Zhen;Runze Chen;Xiangdong Kang;Fayu Wu;Gang Liu
利用窄禁带半导体构建异质结构是一种很有前途的策略，可以在扩大石墨化碳氮化物(g-C3N4)光吸收范围的同时促进电荷分离，从而提高其光催化活性。然而，g-C3N4的高度局域电子态阻碍了光载流子通过体相向异质结界面的迁移，导致固体体相g-C3N4异质结的载流子分离效率较低。本论文以多孔化的g-C3N4(PCN)材料为载体，将载流子从体相到表面的迁移距离大大缩短，构建了用于光催化制氢的CdSe/PCN的II型异质结。通过对整个PCN中的CdSe量子点进行均匀的修饰，再加上CdSe和PCN之间的适当的能带排列，可以有效地分离异质结中的光生载流子。结果表明，CdSe/PcN异质结光催化剂的光催化产氢活性为192.3μ−·h-1，分别是CdSe和PcN的4.4倍和8.1倍。这项工作为构建氮化碳基异构光催化剂以提高可见光驱动的水分解性能提供了一种可行的策略。
Constructing heterostructures with narrow-band-gap semiconductors is a promising strategy to extend light absorption range of graphitic carbon nitride (g-C3N4) and simultaneously promote charge separation for its photocatalytic activity improvement. However, its highly localized electronic states of g-C3N4hinder photo-carrier migration through bulk towards heterostructure interfaces, resulting in low charge carrier separation efficiency of solid bulk g-C3N4-based heterostructures. Herein, porous g-C3N4(PCN) material with greatly shortened migration distance of photo-carriers from bulk to surface was used as an effective substrate to host CdSe quantum dots to construct type II heterostructure of CdSe/PCN for photocatalytic hydrogen production. The homogeneous modification of the CdSe quantum dots throughout the whole bulk of PCN together with proper band alignments between CdSe and PCN enables the effective separation of photo-generated charge carriers in the heterostructure. Consequently, the CdSe/PCN heterostructure photocatalyst gives the greatly enhanced photocatalytic hydrogen production activity of 192.3 μmol h−1, which is 4.4 and 8.1 times that of CdSe and PCN, respectively. This work provides a feasible strategy to construct carbon nitride-based heterostructure photocatalysts for boosting visible light driven water splitting performance.
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影响因子：
10.9
作者：
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通讯作者：
Songcan Wang;Jung‐Ho Yun;Bin Luo;T. Butburee;Piangjai Peerakiatkhajohn;Supphasin Thaweesak;Mu Xiao
影响因子：
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作者：
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通讯作者：
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影响因子：
16.6
作者：
Zhang, Jinshui;Chen, Xiufang;Wang, Xinchen
通讯作者：
Wang, Xinchen
DOI：
10.1021/acsaem.9b01927
发表时间：
2020-02
期刊：
--
影响因子：
--
作者：
Shuying Wang;K. Teramura;T. Hisatomi;K. Domen;Hiroyuki Asakura;S. Hosokawa;Tsunehiro Tanaka
通讯作者：
Shuying Wang;K. Teramura;T. Hisatomi;K. Domen;Hiroyuki Asakura;S. Hosokawa;Tsunehiro Tanaka
影响因子：
19
作者：
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通讯作者：
Cheng, Hui-Ming