A bottom-up acidification strategy engineered ultrathin g-C3N4 nanosheets towards boosting photocatalytic hydrogen evolution

被引：84
作者：
Wang, Longyan [1 ]
Hong, Yuanzhi [1 ]
Liu, Enli [1 ,2 ]
Duan, Xixin [1 ]
Lin, Xue [1 ]
Shi, Junyou [1 ,2 ]
机构：
[1] Beihua Univ, Sch Mat Sci & Engn, 3999 Binjiang East Rd, Jilin 132013, Jilin, Peoples R China
[2] Shandong Univ Technol, Sch Agr & Food Engn, 266 Xincun West Rd, Zibo 255000, Peoples R China
来源：
CARBON | 2020年 / 163卷
基金：
中国国家自然科学基金;
关键词：
Ultrathin g-C3N4 nanosheets; Bottom-up strategy; Photocatalyst; Hydrogen evolution; Water splitting; Solar energy conversion; GRAPHITIC CARBON NITRIDE; HIGH-CRYSTALLINE G-C3N4; ONE-STEP SYNTHESIS; Z-SCHEME; ARTIFICIAL PHOTOSYNTHESIS; CHEMICAL EXFOLIATION; POROUS G-C3N4; WATER; FACILE; HETEROJUNCTION;
D O I：
10.1016/j.carbon.2020.03.031
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：
At present, graphene-like carbon nitride (g-C3N4) has been considered as a promising photocatalyst for photocatalytic hydrogen gas (H-2) evolution from water. The top-down treating of pristine bulk g-C3N4 (CN-B) by strong acid is an efficient modification way to improve photocatalytic performance, yet this strategy is environmental unfriendly because it requires higher strong acid concentration. To this end, here we firstly developed an available bottom-up acidification strategy to prepare the 2D ultrathin g-C3N4 nanosheets (UCNs) by the direct calcination of as-formed precursor derived from hydrothermal treating of melamine merely in diluted H2SO4 solution. As a result, the engineered UCNs with an average thickness of approximately 3 nm exhibited a remarkably enhanced visible-light-driven photocatalytic H-2 evolved rate of 2590 mu mol g(-1) h(-1) (lambda > 400 nm), which is over 9.9-folds and 2.2-folds larger than that of CN-B and acid-treated g-C3N4 (CN-A) under the same condition, respectively. Our research offers a feasible and effective bottom-up acidification strategy for synthesizing the high-performance UCNs photocatalyst towards renewable solar energy conversion. (C) 2020 Elsevier Ltd. All rights reserved.
引用
收藏
页码：234 / 243
页数：10
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