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3D/2D coral-like C3N5/Ti3C2 MXene Schottky heterojunction for enhanced photocatalytic H2 evolution.

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Title: 3D/2D coral-like C3N5/Ti3C2 MXene Schottky heterojunction for enhanced photocatalytic H2 evolution.
Authors: Yu, Pingping1 (AUTHOR), Chen, Shengwang1 (AUTHOR), Wang, Yanyun1 (AUTHOR), Li, Jinghan1 (AUTHOR), Zhang, Zewu1,2 (AUTHOR), Zhao, Shuo1,3 (AUTHOR), Zhang, Yiwei1 (AUTHOR) zhangchem@seu.edu.cn, Zhou, Yuming1 (AUTHOR) ymzhou@seu.edu.cn
Source: International Journal of Hydrogen Energy. Mar2024, Vol. 58, p1266-1276. 11p.
Subjects: Heterojunctions, Silver, Schottky barrier, Band gaps, Hydrogen evolution reactions, Space charge, Analytical chemistry, Charge carriers
Abstract: The C 3 N 5 is broadly applied in photocatalytic conversion owing to its narrow band gap and excellent visible light absorption. Nevertheless, realizing efficient separation of photogenerated charge carriers on C 3 N 5 is still challenging. Herein, a 3D/2D C 3 N 5 /Ti 3 C 2 Schottky heterojunction (PCN/TC) was constructed by combining 3D coral-like C 3 N 5 with Ti 3 C 2 MXene nanosheets through direct electrostatic self-assembly technique. Benefiting from the peculiar structure of C 3 N 5 and the establishment of C 3 N 5 /Ti 3 C 2 Schottky heterojunction, the H 2 evolution yield of the optimized PCN/TC (2581.23 μmol‧g−1‧h−1) is 8.3 and 2.6 times higher than that of bulk C 3 N 5 and coral-like C 3 N 5 , respectively. The mechanism for improving photocatalytic performance is proposed by physical and chemical characterization analysis. Specifically, structural modification of C 3 N 5 resulted in an increase in specific surface area along with a reduction in the diffusion distance of photoexcited electrons. Besides, Ti 3 C 2 possesses enriched active metal sites, further augmenting photocatalytic H 2 production performance. The tight interfacial contact of PCN/TC effectively promotes the photoexcited electrons migration from C 3 N 5 to Ti 3 C 2. Moreover, the formed Schottky barrier constitutes a unidirectional pathway for electron transfer, realizing efficient spatial separation of photogenerated carriers. The research offers a novel approach to producing C 3 N 5 -based efficient photocatalysts for photoconversion applications. [Display omitted] • Coral-like C 3 N 5 /Ti 3 C 2 Schottky heterojunction is constructed. • Coral-like C 3 N 5 improves the specific surface area and reduces the charge transport distance. • C 3 N 5 /Ti 3 C 2 interfacial Schottky heterojunction accelerates space charge separation. • Ti 3 C 2 nanosheets with functional groups possess plentiful active sites. • The mechanism for improving photocatalytic performance is elucidated. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The C 3 N 5 is broadly applied in photocatalytic conversion owing to its narrow band gap and excellent visible light absorption. Nevertheless, realizing efficient separation of photogenerated charge carriers on C 3 N 5 is still challenging. Herein, a 3D/2D C 3 N 5 /Ti 3 C 2 Schottky heterojunction (PCN/TC) was constructed by combining 3D coral-like C 3 N 5 with Ti 3 C 2 MXene nanosheets through direct electrostatic self-assembly technique. Benefiting from the peculiar structure of C 3 N 5 and the establishment of C 3 N 5 /Ti 3 C 2 Schottky heterojunction, the H 2 evolution yield of the optimized PCN/TC (2581.23 μmol‧g−1‧h−1) is 8.3 and 2.6 times higher than that of bulk C 3 N 5 and coral-like C 3 N 5 , respectively. The mechanism for improving photocatalytic performance is proposed by physical and chemical characterization analysis. Specifically, structural modification of C 3 N 5 resulted in an increase in specific surface area along with a reduction in the diffusion distance of photoexcited electrons. Besides, Ti 3 C 2 possesses enriched active metal sites, further augmenting photocatalytic H 2 production performance. The tight interfacial contact of PCN/TC effectively promotes the photoexcited electrons migration from C 3 N 5 to Ti 3 C 2. Moreover, the formed Schottky barrier constitutes a unidirectional pathway for electron transfer, realizing efficient spatial separation of photogenerated carriers. The research offers a novel approach to producing C 3 N 5 -based efficient photocatalysts for photoconversion applications. [Display omitted] • Coral-like C 3 N 5 /Ti 3 C 2 Schottky heterojunction is constructed. • Coral-like C 3 N 5 improves the specific surface area and reduces the charge transport distance. • C 3 N 5 /Ti 3 C 2 interfacial Schottky heterojunction accelerates space charge separation. • Ti 3 C 2 nanosheets with functional groups possess plentiful active sites. • The mechanism for improving photocatalytic performance is elucidated. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2024.01.272