A one-pot sealed ammonia self-etching strategy to synthesis of N-defective g-C3N4 for enhanced visible-light photocatalytic hydrogen

被引:82
作者
Guo, Feng [1 ]
Wang, Lijing [2 ]
Sun, Haoran [1 ]
Li, Mingyang [3 ]
Shi, Weilong [3 ]
Lin, Xue [4 ]
机构
[1] Jiangsu Univ Sci & Technol, Sch Energy & Power, Zhenjiang 212003, Jiangsu, Peoples R China
[2] Shangqiu Normal Univ, Coll Chem & Chem Engn, Henan Engn Ctr New Energy Battery Mat, Henan D&A Engn Ctr Adv Battery Mat, Shangqiu 476000, Peoples R China
[3] Jiangsu Univ Sci & Technol, Sch Mat Sci & Engn, Zhenjiang 212003, Jiangsu, Peoples R China
[4] Beihua Univ, Sch Mat Sci & Engn, Jilin 132013, Jilin, Peoples R China
关键词
N-defective g-C3N4; High yield; Photocatalyst; Hydrogen evolution; Sealed; GRAPHITIC CARBON NITRIDE; EVOLUTION ACTIVITY; COBALT PHOSPHIDE; NITROGEN DEFECTS; NANOSHEETS; WATER; HETEROJUNCTION; COCATALYST; REDUCTION; NANOCOMPOSITES;
D O I
10.1016/j.ijhydene.2020.08.080
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Photocatalytic hydrogen (H-2) evolution from water is considered as a prospective approach, which can convert inexhaustible solar energy into chemical energy to alleviate energy crisis and environmental problems. Herein, the N-defective g-C3N4 with porous structure was firstly synthesized in a sealed crucible by one-step thermal polymerization method. The experimental data showed that the yield of the catalyst was obviously increased under sealing condition. Moreover, the N-defective g-C3N4 prepared from urea precursor under sealed condition reached an optimum photocatalytic H-2 production rate of 597.4 mu mol/h and an apparent quantum efficiency of 15.6% at wavelength of 420 nm. This enhanced photocatalytic H-2 production performance is mainly ascribed to the introduction of N-defects, which not only extended of the visible light absorption, but also acted as the electron trap centers to suppress the recombination of the photogenerated electron and hole pairs. This work offers one-step facile strategy for the introduction of N-defects to prepare N-defective g-C3N4 with superior photocatalytic activity, which is also a great substitute for the high-energy consuming and complicated synthetic routes. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:30521 / 30532
页数:12
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