An insight into the trifunctional roles of Cu_2(OH)_2CO_3 cocatalyst in boosting the photocatalytic H_2 evolution activity over Zn_(0.5)Cd_(0.5)S nanoparticles 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials
年/卷/期
2019 / 484 / Aug.1
页码
1061-1069
ISSN号
0169-4332
作者单位
Henan Normal Univ, Sch Chem & Chem Engn, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Key Lab Green Chem Media & React,Minist Educ, Xinxiang 453007, Henan, Peoples R China;Henan Normal Univ, Sch Chem & Chem Engn, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Key Lab Green Chem Media & React,Minist Educ, Xinxiang 453007, Henan, Peoples R China;Henan Normal Univ, Sch Chem & Chem Engn, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Key Lab Green Chem Media & React,Minist Educ, Xinxiang 453007, Henan, Peoples R China;Henan Normal Univ, Sch Chem & Chem Engn, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Key Lab Green Chem Media & React,Minist Educ, Xinxiang 453007, Henan, Peoples R China;Henan Normal Univ, Sch Chem & Chem Engn, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Key Lab Green Chem Media & React,Minist Educ, Xinxiang 453007, Henan, Peoples R China;
作者
Liu, Yumin;Ren, Hao;Lv, Hua;Gong, Zhiyuan;Cao, Yafei;
摘要
The construction of efficient semiconductor/cocatalyst heterojunction is a promising strategy to promote the photocatalytic H-2-production efficiency from water reduction. Herein, a novel Cu-2(OH)(2)CO3/Zn0.5Cd0.5S heterojunction composite with superior photocatalytic H-2-generation activity and stability was prepared via a facile in situ synthetic route, in which Cu-2(OH)(2)CO3 served as cocatalyst stimulating the photocatalytic H-2-evolution performance of Zn0.5Cd0.5S. The Cu-2(OH)(2)CO3/Zn0.5Cd0.5S heterojunction photocatalyst containing 5 wt% of Cu-2(OH)(2)CO3 exhibited a prominent H-2-evolution efficiency of 275.7 mu mol h(-1), which is superior to the noble metal Pt-modified Zn0.5Cd0.5S photocatalyst (237.3 mu mol h(-1)) and much higher than bare Zn0.5Cd0.5S (90.8 mu mol h(-1)). The active Cu+/Cu-0 species generated during the photoreaction process is responsible for the prominent H-2-production activity of the heterojunction photocatalyst, which plays triple roles in enhancing the photoactivity of Zn0.5Cd0.5S via accelerating the charge separation, decreasing the overpotential of H-2-generation and improving the reduction ability of photoinduced electrons. Moreover, the formed Cu+/Cu-0 species during photoreaction can be readily oxidized back to Cu-2(OH)(2)CO3 upon exposure to air, thus restores the photoactivity and therefore enables good reusability of the Cu-2(OH)(2)CO3/Zn0.5Cd0.5S heterojunction photocatalysts. This work provides a new insight into the fabrication of Cu-2(OH)(2)CO3-assisted heterojunction photocatalysts with the highly stable and efficient performances for solar-to-chemical energy conversion.
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关键词/主题词
Photocatalytic H-2-production;Zn0.5Cd0.5S;Cu-2(OH)(2)CO3;Cocatalyst;
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