Rationally designed ternary CdSe/WS2/g-C3N4 hybrid photocatalysts with significantly enhanced hydrogen evolution activity and mechanism insight
Rationally designed ternary CdSe/WS2/g-C3N4 hybrid photocatalysts with significantly enhanced hydrogen evolution activity and mechanism insight
复制标题
合理设计的三元CdSe/WS2/g-C3N4杂化光催化剂显着增强析氢活性和机理洞察
DOI：
10.1016/j.ijhydene.2021.06.165
复制
发表时间：
2021-07
影响因子：
7.2
通讯作者：
Huang Yuexiang
中科院分区：
文献类型：
--
作者：
Pan Jianhui;Liang Junhui;Xu Zhenxia;Yao Xin;Qiu Jia;Chen Huayu;Qin Laishun;Chen Da;Huang Yuexiang
良好的光收获、高效的电荷分离和充分暴露的表面活性位点是给定光催化剂获得优异光催化性能的关键。构建二维/二维（2D/2D）或零维/二维（0D/2D）二元异质结是解决这些关键问题的有效途径之一。本文通过用CdSe量子点（QDs）修饰WS2/g-C3N42D/2D纳米片（NSs），制备了一种三元CdSe/WS2/g- c3n4复合光催化剂，进一步增加了光收获，加速了光生电子-空穴对的分离和迁移，从而提高了太阳能到氢的转换效率。结果表明，CdSe/WS2/g- c3n4复合光催化剂的光催化析氢速率为1.29 mmol g−1h−1，比原始的g- c3n4nss （0.43 mmol g−1h−1）、WS2/g- c3n42d /2D NSs （0.74 mmol g−1h−1）和CdSe/g- c3n40d /2D复合光催化剂（0.96 mmol g−1h−1）分别提高了3.0、1.7和1.3倍。制备的三元CdSe/WS2/g- c3n4复合材料具有优异的光催化性能，主要是由于在g-C3N4NSs、CdSe量子点和WS2NSs的界面处构建的ii型/ ii型异质结诱导了有效的电荷分离和迁移，以及抑制了光生电荷的重组。因此，本研究开发的0D/2D/2D三元ii型/ ii型异质结为设计新型多相光催化剂以实现高效光催化析氢开辟了新的思路。
Excellent light harvest, efficient charge separation and sufficiently exposed surface active sites are crucial for a given photocatalyst to obtain excellent photocatalytic performances. The construction of two-dimensional/two-dimensional (2D/2D) or zero-dimensional/2D (0D/2D) binary heterojunctions is one of the effective ways to address these crucial issues. Herein, a ternary CdSe/WS2/g-C3N4composite photocatalyst through decorating WS2/g-C3N42D/2D nanosheets (NSs) with CdSe quantum dots (QDs) was developed to further increase the light harvest and accelerate the separation and migration of photogenerated electron-hole pairs and thus enhance the solar to hydrogen conversion efficiency. As expected, a remarkably enhanced photocatalytic hydrogen evolution rate of 1.29 mmol g−1h−1was obtained for such a specially designed CdSe/WS2/g-C3N4composite photocatalyst, which was about 3.0, 1.7 and 1.3 times greater than those of the pristine g-C3N4NSs (0.43 mmol g−1h−1), WS2/g-C3N42D/2D NSs (0.74 mmol g−1h−1) and CdSe/g-C3N40D/2D composites (0.96 mmol g−1h−1), respectively. The superior photocatalytic performance of the prepared ternary CdSe/WS2/g-C3N4composite could be mainly attributed to the effective charge separation and migration as well as the suppressed photogenerated charge recombination induced by the constructed type-II/type-II heterojunction at the interfaces between g-C3N4NSs, CdSe QDs and WS2NSs. Thus, the developed 0D/2D/2D ternary type-II/type-II heterojunction in this work opens up a new insight in designing novel heterogeneous photocatalysts for highly efficient photocatalytic hydrogen evolution.
登录
查看更多内容
影响因子：
13.3
作者：
Xiaowei Shi;M. Fujitsuka;Sooyeon Kim;T. Majima
通讯作者：
Xiaowei Shi;M. Fujitsuka;Sooyeon Kim;T. Majima
影响因子：
7.2
作者：
Shengnan Tang;Yong Zhu;Hua-ming Li;Hui Xu;S. Yuan
通讯作者：
Shengnan Tang;Yong Zhu;Hua-ming Li;Hui Xu;S. Yuan
DOI：
10.5155/eurjchem.10.1.82-94.1809
发表时间：
2019-03
期刊：
European Journal of Chemistry
影响因子：
--
作者：
Eshraq Ahmed Abdullah
通讯作者：
Eshraq Ahmed Abdullah
影响因子：
6.2
作者：
Li, Weibing;Wang, Lin;Sun, Mingxian
通讯作者：
Sun, Mingxian
DOI：
10.1016/j.apcatb.2018.11.031
发表时间：
2019-05
期刊：
Applied Catalysis B: Environmental
影响因子：
--
作者：
Miaoxin Zhou;Zhihua Liu;Qing Song;Xifei Li;BoWen Chen;Zhifeng Liu
通讯作者：
Miaoxin Zhou;Zhihua Liu;Qing Song;Xifei Li;BoWen Chen;Zhifeng Liu