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- Title
Engineering Migration Pathway for Effective Separation of Photogenerated Carriers on Multicomponent Heterojunctions Coated with Nitrogen‐Doped Carbon.
- Authors
Zhuang, Yuan; Sun, Liming; Zeng, Suyuan; Zhan, Wenwen; Wang, Xiao‐Jun; Zhao, Yanli; Han, Xiguang
- Abstract
Multicomponent NiTiO3/A‐TiO2/R‐TiO2 photocatalysts coated with nitrogen‐doped carbon (N‐C/NiTiO3/A‐TiO2/R‐TiO2) for efficient H2 production were fabricated by directly pyrolyzing NH2‐MIL‐125(Ni/Ti) metal–organic framework microrods. Owing to the synergistic effect of the N‐doped carbon coating layer and multicomponent heterojunctions, the H2 production rate of N‐C/NiTiO3/A‐TiO2/R‐TiO2 was even higher than that of its Pt‐containing counterpart (Pt/NiTiO3/A‐TiO2/R‐TiO2). N‐C/NiTiO3/A‐TiO2 and N‐C/NiTiO3/R‐TiO2 as control photocatalysts were also prepared by simply adjusting the calcination temperature of NH2‐MIL‐125(Ni/Ti) in air atmosphere. The H2 production rate followed the order of N‐C/NiTiO3/A‐TiO2/R‐TiO2>N‐C/NiTiO3/A‐TiO2>N‐C/NiTiO3>R‐TiO2, which indicates that the multicomponent heterojunction plays a key role in photocatalytic H2 generation. The mechanism for the influence of the multicomponent heterojunction on photocatalytic activity was investigated in combination with molecular simulations, which showed that N‐C/NiTiO3/A‐TiO2/R‐TiO2 has a so‐called double type II heterojunction providing a perfect step‐by‐step migration pathway for effective separation of photogenerated electrons and holes. This work presents a simple and effective method for synthesizing efficient multicomponent photocatalysts.
- Subjects
PHOTOCATALYSTS; METAL-organic frameworks; HETEROJUNCTIONS; CARBON; NITROGEN
- Publication
Chemistry - A European Journal, 2019, Vol 25, Issue 62, p14133
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201902922