Efficient Visible‐Light‐Driven Z‐Scheme Overall Water Splitting Using a MgTa2O6−xNy /TaON Heterostructure Photocatalyst for H2 Evolution1. (3rd June 2015)

• Record Type: Journal Article
• Authors: Chen, Shanshan; Qi, Yu; Hisatomi, Takashi; Ding, Qian; Asai, Tomohiro; Li, Zheng; Ma, Su Su Khine; Zhang, Fuxiang; Domen, Kazunari; Li, Can
• Is Part Of: Angewandte Chemie. Volume 127:Number 29(2015)
• Page Start: 8618
• Page End: 8621
• Publication Date: 2015-06-03
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201502686
• Languages: English
• ISSNs: 0044-8249

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>An (oxy)nitride‐based heterostructure for powdered Z‐scheme overall water splitting is presented. Compared with the single MgTa₂O_{6−<italic>x</italic>}N_{<italic>y</italic>} or TaON photocatalyst, a MgTa₂O_{6−<italic>x</italic>}N_{<italic>y</italic>} /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−<italic>x</italic>}N_{<italic>y</italic>} /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_{<italic>x</italic>}‐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−<italic>x</italic>}N_{<italic>y</italic>} 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.</p> </abstract>