Efficient Visible-Light-Driven Z-Scheme Overall Water Splitting Using a MgTa2O(6-x)N(y)/TaON Heterostructure Photocatalyst for H2 Evolution
In: Angewandte Chemie (International ed. in English), Jg. 54 (2015-03-25), Heft 29
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Zugriff:
An (oxy)nitride-based heterostructure for powdered Z-scheme overall water splitting is presented. Compared with the single MgTa2O(6-x)N(y) or TaON photocatalyst, a MgTa2O(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 MgTa2O(6-x)N(y)/TaON as a H2-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)-WO3 and IO3(-)/I(-) pairs were used as an O2-evolving photocatalyst and a redox mediator, respectively), the activity of which is circa 7 or 360 times of that using Pt-TaON or Pt-MgTa2O(6-x)N)y) as a H2-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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Efficient Visible-Light-Driven Z-Scheme Overall Water Splitting Using a MgTa2O(6-x)N(y)/TaON Heterostructure Photocatalyst for H2 Evolution
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Autor/in / Beteiligte Person: | Qi, Yu ; Li, Can ; Zhang, Fuxiang ; Li, Zheng ; Asai, Tomohiro ; Chen, Shanshan ; Ding, Qian ; Hisatomi, Takashi ; Su Su Khine Ma ; Domen, Kazunari |
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Zeitschrift: | Angewandte Chemie (International ed. in English), Jg. 54 (2015-03-25), Heft 29 |
Veröffentlichung: | 2015 |
Medientyp: | unknown |
ISSN: | 1521-3773 (print) |
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