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In Situ Fabrication of Robust Cocatalyst‐Free CdS/g‐C 3 N 4 2D–2D Step‐Scheme Heterojunctions for Highly Active H 2 Evolution
Author(s) -
Ren Doudou,
Zhang Weinan,
Ding Yingna,
Shen Rongchen,
Jiang Zhimin,
Lu Xinyong,
Li Xin
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900423
Subject(s) - heterojunction , materials science , semiconductor , hydrothermal circulation , fabrication , photocatalysis , nanotechnology , chemical engineering , optoelectronics , chemistry , catalysis , medicine , biochemistry , alternative medicine , pathology , engineering
Efficient H 2 O splitting for H 2 evolution over the semiconductor photocatalyst is a crucial strategy in the field of energy and environment. Herein, cocatalyst‐free 2D–2D CdS/g‐C 3 N 4 step‐scheme (S‐scheme) heterojunction photocatalysts are fabricated through in situ hydrothermal growth of 2D CdS nanosheets (NSs) on 2D g‐C 3 N 4 NSs. The results clearly confirm that the binary CdS/0.7g‐C 3 N 4 S‐scheme heterojunction shows the best H 2 production rate (15.3 mmol g −1 h −1 ) without using any cocatalyst, which is 3.83 times and 3060 times higher than those of pure CdS and g‐C 3 N 4 , respectively. The apparent efficiency of CdS/0.7g‐C 3 N 4 at 420 nm is 6.86%. Importantly, the as‐prepared CdS/0.7g‐C 3 N 4 S‐scheme heterojunction has good stability when continuously irradiated for 21 h. The improved stability and activity are attributed to the formation of the S‐scheme heterojunction, which can markedly accelerate the interfacial charge separation for surface reaction. It is expected that the design of robust cocatalyst‐free CdS/g‐C 3 N 4 2D–2D S‐scheme heterojunction can become a promising approach to develop the highly active H 2 evolution systems based on various kinds of conventional semiconductor NSs.