期刊
CHEMICAL ENGINEERING JOURNAL
卷 469, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.143902
关键词
Overall water splitting; Hollowcore-shell; Ni2+ions self-doping; HER; OER synergism
The synergetic effect of Ni2+-LaNiO3/CdS on photocatalytic water splitting was investigated, and it was found that the material exhibited enhanced activity under visible light, achieving good water splitting performance and stability.
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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