Photodepositing CdS on the Active Cyano Groups Decorated g‐C 3 N 4 in Z‐Scheme Manner Promotes Visible‐Light‐Driven Hydrogen Evolution

Wang, Zhipeng; Wang, Zilin; Zhu, Xiaodi; Ai, Changzhi; Zeng, Yamei; Shi, Wenyan; Zhang, Xidong; Zhang, Haoran; Si, Hewei; Li, Jin; Wang, Cai‐Zhuang; Lin, Shiwei

doi:10.1002/smll.202102699

Title: Photodepositing CdS on the Active Cyano Groups Decorated g‐C ₃ N ₄ in Z‐Scheme Manner Promotes Visible‐Light‐Driven Hydrogen Evolution

Journal Article · 15 August 2021 · Small

DOI: https://doi.org/10.1002/smll.202102699 · OSTI ID:1813484

Wang, Zhipeng ^[1]; Wang, Zilin ^[1]; Zhu, Xiaodi ^[2]; Ai, Changzhi ^[1]; Zeng, Yamei ^[1]; Shi, Wenyan ^[3]; Zhang, Xidong ^[1]; Zhang, Haoran ^[1]; Si, Hewei ^[1]; Li, Jin ^[4]; Wang, Cai‐Zhuang ^[5];

^[1]

State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and Engineering Hainan University Haikou 570228 P. R. China
National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 P. R. China
Department of Chemical Engineering and Biotechnology University of Cambridge Cambridge CB3 0AS UK
School of Science Hainan University Haikou 570228 P. R. China
Ames Laboratory‐U. S. Department of Energy, and Department of Physics and Astronomy Iowa State University Ames IA 50011 USA

Abstract g‐C ₃ N ₄ /CdS heterojunctions are potential photocatalysts for hydrogen production but their traditional type‐II configuration generally leads to weak oxidative and reductive activity. How to construct the novel Z‐scheme g‐C ₃ N ₄ /CdS counterparts to address this issue remains a great challenge in this field. In this work, a new direct Z‐scheme heterojunction of defective g‐C ₃ N ₄ /CdS is designed by introducing cyano groups (NC‐) as the active bridge sites. Experimental observations in combination with density functional theory (DFT) calculations reveal that the unique electron‐withdrawing feature of cyano groups in the defective g‐C ₃ N ₄ /CdS heterostructure can endow this photocatalyst with numerous advantageous properties including high light absorption ability, strong redox performance, satisfactory charge separation efficiency, and long lifetime of charge carriers. Consequently, the resultant photocatalytic system exhibits more active performance than CdS and g‐C ₃ N ₄ under visible light and reaches an excellent hydrogen evolution rate of 1809.07 µmol h ⁻¹ g ⁻¹ , which is 6.09 times higher than pristine g‐C ₃ N ₄ . Moreover, the defective g‐C ₃ N ₄ /CdS photocatalyst maintains good stability after 40 h continuous test. This work provides new insights into design and construction of Z‐scheme heterojunctions for regulating the visible‐light‐induced photocatalytic activity for H ₂ evolution.

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Sponsoring Organization:: USDOE

OSTI ID:: 1813484

Journal Information:: Small, Journal Name: Small Journal Issue: 39 Vol. 17; ISSN 1613-6810

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Title: Photodepositing CdS on the Active Cyano Groups Decorated g‐C ₃ N ₄ in Z‐Scheme Manner Promotes Visible‐Light‐Driven Hydrogen Evolution