The Ni2+-LaNiO3/CdS hollow core-shell heterojunction towards enhanced visible light overall water splitting H2 evolution via HER/OER synergism of Ni2+/Ov

被引：46
作者：
Que, Lixin [1 ]
Lu, Lei [1 ]
Xu, Yunlong [1 ]
Xu, Xiaoqing [1 ]
Zhu, Mei [2 ]
Pan, Jiaqi [1 ]
Cao, Jun [1 ]
Wang, Jingjing [1 ]
Zheng, Yingying [1 ]
Li, Chaorong [1 ]
机构：
[1] Zhejiang Sci Tech Univ, Dept Phys, Key Lab Opt Field Manipulat Zhejiang Prov, Hangzhou 310018, Peoples R China
[2] Zhejiang Sci Tech Univ, Sch Chem & Chem Engn, Hangzhou 310018, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2023年 / 469卷
基金：
中国国家自然科学基金;
关键词：
Overall water splitting; Hollowcore-shell; Ni2+ions self-doping; HER; OER synergism; RATIONAL DESIGN; Z-SCHEME; HYDROGEN; HETEROSTRUCTURE; PERFORMANCE; NANOWIRES; EFFICIENT; LANIO3;
D O I：
10.1016/j.cej.2023.143902
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The synergetic HER/OER (hydrogen evolution reaction/oxygen evolution reaction) is the crucial issue for overall water splitting. Herein, the Ni2+-LaNiO3/CdS hollow core-shell heterojunction with HER/OER synergism of Ni2+/Ov (oxygen vacancy) is synthesized by a hybrid hydrothermal-reductive-chemical method. As shown, the Ni2+-LaNiO3/CdS (-15480.79 & mu;mol & BULL;g 1 & BULL;h  1) exhibits an obvious visible light photocatalytic enhancement (HER/Photodegradation) than that of single LaNiO3 (-200/-15 folds) and single CdS (-120/-6 folds), and achieves a better overall water splitting performance of -645.23(H2)/321.62(O2) & mu;mol & BULL;g  1 & BULL;h  1 (-110 folds of LaNiO3), and a respectable stability (-5.64% decreasing during 24 h). It mainly ascribes to the synergetic HER/ OER via the Ni2+/Ov, formed heterojunction and hollow core-shell structure. There, the Ni2+ ions can increase solar efficiency and promote photo-generated electron diffusing for HER, the Ov induced by Ni2+ can decrease OER energy barrier and promote hole-related species transportation for OER, the LaNiO3/CdS heterojunction with appropriate potential gradient can improve carrier efficiency, and the hollow core-shell structure can in-crease active sites and solar efficiency. Furthermore, the quickly carrier diffusion can inhibit photocorrosion and hollow spherical structure can increase photocatalytic stability.
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页数：12
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