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Direct Z-scheme g-C_3N_4/WO_3 photocatalyst with atomically defined junction for H_2 production

Yu, Weilai and Chen, Junxiang and Shang, Tongtong and Chen, Linfeng and Gu, Lin and Peng, Tianyou (2017) Direct Z-scheme g-C_3N_4/WO_3 photocatalyst with atomically defined junction for H_2 production. Applied Catalysis B, 219 . pp. 693-704. ISSN 0926-3373. http://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-C_3N_4/WO_3 photocatalyst with host-guest architecture is rationally designed, demonstrating significantly enhanced activities of photocatalytic H_2 production. Unprecedented atomic-scale imaging of both the in-plane and interlayer structures in g-C_3N_4 revealed the well-defined interfaces in such architecture, where the 2D g-C_3N_4 layers stand vertically on the flat facets of WO_3 nanocuboids. Through both experimental and theoretical investigations, mechanistic insights regarding the direct Z-scheme electron transfer from WO_3 to g-C_3N_4 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 WO_3 to inhibit the fast recombination kinetics within g-C_3N_4 and prolong the charge carrier lifetime of g-C_3N_4, thereby liberating more excited electrons with high reducing power for H_2 production.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.apcatb.2017.08.018DOIArticle
http://www.sciencedirect.com/science/article/pii/S0926337317307543PublisherArticle
Additional Information:© 2017 Elsevier B.V. Received 6 July 2017, Revised 29 July 2017, Accepted 3 August 2017, Available online 8 August 2017.
Subject Keywords:Z-scheme; internal electric field; carbon nitride; atomic structure; photocatalytic H2 production
Record Number:CaltechAUTHORS:20170808-100125705
Persistent URL:http://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. (http://www.sciencedirect.com/science/article/pii/S0926337317307543)
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:26 Oct 2017 16:01

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