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Direct Z-scheme g-C₃N₄/WO₃ photocatalyst with atomically defined junction for H₂ production

Yu, Weilai and Chen, Junxiang and Shang, Tongtong and Chen, Linfeng and Gu, Lin and Peng, Tianyou (2017) Direct Z-scheme g-C₃N₄/WO₃ photocatalyst with atomically defined junction for H₂ production. Applied Catalysis B, 219 . pp. 693-704. ISSN 0926-3373. https://resolver.caltech.edu/CaltechAUTHORS:20170808-100125705

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Abstract

Mimicking the natural photosynthesis, artificial Z-scheme photocatalysis enables more efficient utilization of solar energy for sustainable chemical fuel production. Herein, a direct Z-scheme g-C₃N₄/WO₃ photocatalyst with host-guest architecture is rationally designed, demonstrating significantly enhanced activities of photocatalytic H₂ production. Unprecedented atomic-scale imaging of both the in-plane and interlayer structures in g-C₃N₄ revealed the well-defined interfaces in such architecture, where the 2D g-C₃N₄ layers stand vertically on the flat facets of WO₃ nanocuboids. Through both experimental and theoretical investigations, mechanistic insights regarding the direct Z-scheme electron transfer from WO₃ to g-C₃N₄ were obtained. The Z-scheme electron transfer was driven by the internal electric field at the interfacial junction, defined by the covalent W-O-N-(C)₂ interaction. Under simultaneous light excitation, this atomically defined junction induces a rapid electron injection from WO₃ to inhibit the fast recombination kinetics within g-C₃N4 and prolong the charge carrier lifetime of g-C₃N₄, thereby liberating more excited electrons with high reducing power for H₂ production.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.apcatb.2017.08.018DOIArticle
ORCID:
AuthorORCID
Yu, Weilai0000-0002-9420-0702
Peng, Tianyou0000-0002-2527-7634
Alternate Title:Direct Z-scheme g-C3N4/WO3 photocatalyst with atomically defined junction for H2 production
Additional Information:© 2017 Elsevier B.V. Received 6 July 2017, Revised 29 July 2017, Accepted 3 August 2017, Available online 8 August 2017. This work was supported by National Program on Key Basic Research Project (2014CB921002) and The Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB07030200) and National Natural Science Foundation of China (51522212, 51421002).
Funders:
Funding AgencyGrant Number
National Program on Key Basic Research Projects of China2014CB921002
Chinese Academy of SciencesXDB07030200
National Natural Science Foundation of China51522212
National Natural Science Foundation of China51421002
Subject Keywords:Z-scheme; internal electric field; carbon nitride; atomic structure; photocatalytic H2 production
Record Number:CaltechAUTHORS:20170808-100125705
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170808-100125705
Official Citation:Weilai Yu, Junxiang Chen, Tongtong Shang, Linfeng Chen, Lin Gu, Tianyou Peng, Direct Z-scheme g-C3N4/WO3 photocatalyst with atomically defined junction for H2 production, In Applied Catalysis B: Environmental, Volume 219, 2017, Pages 693-704, ISSN 0926-3373, https://doi.org/10.1016/j.apcatb.2017.08.018.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79925
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Aug 2017 02:17
Last Modified:24 Nov 2020 23:46

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