Efficient Visible-Light-Driven Z-Scheme Overall Water Splitting Using a MgTa2O6-xNy/TaON Heterostructure Photocatalyst for H2 Evolution

被引：250
|
作者：
Chen, Shanshan [1 ,2 ]
Qi, Yu [1 ,2 ]
Hisatomi, Takashi [3 ]
Ding, Qian [1 ,2 ]
Asai, Tomohiro [3 ]
Li, Zheng [1 ,2 ]
Ma, Su Su Khine [3 ]
Zhang, Fuxiang [1 ]
Domen, Kazunari [3 ]
Li, Can [1 ]
机构：
[1] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, State Key Lab Catalysis,iChEM, Dalian 116023, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Univ Tokyo, Sch Engn, Dept Chem Syst Engn, Bunkyo Ku, Tokyo 1138656, Japan
来源：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2015年 / 54卷 / 29期
基金：
日本学术振兴会;
关键词：
heterostructures; hydrogen; overall water splitting; oxynitrides; photocatalysis; HYDROGEN EVOLUTION; OXIDATION; O-2; SEPARATION; OXYNITRIDE; METHANOL; PT/TIO2; TAON;
D O I：
10.1002/anie.201502686
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
An (oxy)nitride-based heterostructure for powdered Z-scheme overall water splitting is presented. Compared with the single MgTa2O6-xNy or TaON photocatalyst, a MgTa2O6-xNy/TaON heterostructure fabricated by a simple one-pot nitridation route was demonstrated to effectively suppress the recombination of carriers by efficient spatial charge separation and decreased defect density. By employing Pt-loaded MgTa2O6-xNy/TaON as a H-2-evolving photocatalyst, a Z-scheme overall water splitting system with an apparent quantum efficiency (AQE) of 6.8% at 420 nm was constructed (PtOx-WO3 and IO3- /I- pairs were used as an O-2-evolving photocatalyst and a redox mediator, respectively), the activity of which is circa 7 or 360 times of that using Pt-TaON or Pt-MgTa2O6-xNy as a H-2-evolving photocatalyst, respectively. To the best of our knowledge, this is the highest AQE among the powdered Z-scheme overall water splitting systems ever reported.
引用
收藏
页码：8498 / 8501
页数：4
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