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
Abstract 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 sup...
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Published in | Angewandte Chemie International Edition Vol. 54; no. 29; pp. 8498 - 8501 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
13.07.2015
|
Online Access | Get full text |
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Summary: | Abstract
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. |
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ISSN: | 1433-7851 1521-3773 |
DOI: | 10.1002/anie.201502686 |