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Efficient Visible‐Light‐Driven Z‐Scheme Overall Water Splitting Using a MgTa 2 O 6− x N y /TaON Heterostructure Photocatalyst for H 2 Evolution
Author(s) -
Chen Shanshan,
Qi Yu,
Hisatomi Takashi,
Ding Qian,
Asai Tomohiro,
Li Zheng,
Ma Su Su Khine,
Zhang Fuxiang,
Domen Kazunari,
Li Can
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201502686
Subject(s) - photocatalysis , heterojunction , water splitting , quantum efficiency , scheme (mathematics) , physics , visible spectrum , redox , materials science , nanotechnology , optoelectronics , chemistry , catalysis , mathematics , mathematical analysis , biochemistry , metallurgy
An (oxy)nitride‐based heterostructure for powdered Z‐scheme overall water splitting is presented. Compared with the single MgTa 2 O 6− x N y or TaON photocatalyst, a MgTa 2 O 6− x N y /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 MgTa 2 O 6− x N y /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 (PtO x ‐WO 3 and IO 3 − /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‐MgTa 2 O 6− x N y 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.