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Nano Research 2023, 16(7): 8782-8792 https://doi.org/10.1007/s12274-023-5504-6
Research Article | Issue | Published: 17 May 2023

Homojunction and ohmic contact coexisting carbon nitride for efficient photocatalytic hydrogen evolution

Show Author's Information Xiao Fang1,  Lu Chen1,  Hongrui Cheng2,  Xiaoqiong Bian1,  Wenhao Sun1,4,  Kaining Ding1,  Xinghe Xia1,  Xin Chen1( ),  Jiefang Zhu4,5( ),  Yuanhui Zheng1,2,3( )
College of Chemistry, Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated Materials, Fuzhou University, Fuzhou 350116, China
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350116, China
College of Physics and Information Engineering, Fuzhou University, Fuzhou 350116, China
Department of Chemistry − Ångström Laboratory, Uppsala University, Uppsala SE-751 21, Sweden
The Key Laboratory for Ultrafine Materials of The Ministry of Education, East China University of Science and Technology, Shanghai 200237, China
Keywords:
carbon nitride, photocatalysis, hydrogen evolution, ohmic contact, homojunction
Topics:
Hydrogen evolution reaction Semiconductor junctions
Cite this article:
Fang X, Chen L, Cheng H, et al. Homojunction and ohmic contact coexisting carbon nitride for efficient photocatalytic hydrogen evolution. Nano Research, 2023, 16(7): 8782-8792. https://doi.org/10.1007/s12274-023-5504-6
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Abstract Full text Electronic supplementary material About this article

Carbon nitride (CN) has attracted intensive attention as a visible light photocatalyst, but the rapid recombination of photogenerated charge carriers limits its photocatalytic activity. Herein, we develop a new strategy to construct both homojunction and ohmic junction into CN via selectively introducing metallized CN (MCN), which leads to rapid separation and transfer of photogenerated charge carriers. The polymerization of urea in the presence of KOH creates CN homojunction with amino and cyano groups. The subsequent molten salt treatment induces a new type of cyano-terminated CN that can be converted to MCN through photodoping, forming homojunction and ohmic contact coexisting CN (HOCN). The formed HOCN photocatalyst exhibits a high photocatalytic H2 evolution rate of 18.5 mmol·g−1·h−1 under visible light irradiation, 45-fold higher than that of bulk CN. This strategy provides a new idea for designing ohmic contact between semiconductor and metal, and realizing efficient photocatalysis by improving charge separation and transfer.


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About this article

Homojunction and ohmic contact coexisting carbon nitride for efficient photocatalytic hydrogen evolution

Show Author's information Xiao Fang1, Lu Chen1, Hongrui Cheng2, Xiaoqiong Bian1, Wenhao Sun1,4, Kaining Ding1, Xinghe Xia1, Xin Chen1( ), Jiefang Zhu4,5( ), Yuanhui Zheng1,2,3( )
College of Chemistry, Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated Materials, Fuzhou University, Fuzhou 350116, China
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350116, China
College of Physics and Information Engineering, Fuzhou University, Fuzhou 350116, China
Department of Chemistry − Ångström Laboratory, Uppsala University, Uppsala SE-751 21, Sweden
The Key Laboratory for Ultrafine Materials of The Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Abstract

Carbon nitride (CN) has attracted intensive attention as a visible light photocatalyst, but the rapid recombination of photogenerated charge carriers limits its photocatalytic activity. Herein, we develop a new strategy to construct both homojunction and ohmic junction into CN via selectively introducing metallized CN (MCN), which leads to rapid separation and transfer of photogenerated charge carriers. The polymerization of urea in the presence of KOH creates CN homojunction with amino and cyano groups. The subsequent molten salt treatment induces a new type of cyano-terminated CN that can be converted to MCN through photodoping, forming homojunction and ohmic contact coexisting CN (HOCN). The formed HOCN photocatalyst exhibits a high photocatalytic H2 evolution rate of 18.5 mmol·g−1·h−1 under visible light irradiation, 45-fold higher than that of bulk CN. This strategy provides a new idea for designing ohmic contact between semiconductor and metal, and realizing efficient photocatalysis by improving charge separation and transfer.

Keywords: carbon nitride, photocatalysis, hydrogen evolution, ohmic contact, homojunction

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Acknowledgements

Publication history

Received: 14 October 2022
Revised: 10 January 2023
Accepted: 13 January 2023
Published: 17 May 2023
Issue date: July 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

We thank the Recruitment Program of Global Experts, the National Natural Science Foundation of China (Nos. 62175033 and 61775040), the Hundred-Talent Project of Fujian, Fujian Science & Technology Innovation Laboratory for Optoelectronic Information (No. 2021ZZ126), Stiftelsen Olle Engkvist Byggmastare (No. SOEB-2015/167), Swedish Energy Agency (No. 46641-1), and The Key Laboratory for Ultrafine Materials of The Ministry of Education at East China University of Science and Technology for the financial support.

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