Construction of carbon dots modified hollow g-C3N4 spheres via in situ calcination of cyanamide and glucose for highly enhanced visible light photocatalytic hydrogen evolution

被引：35

作者：

Ding, Yuan ^{[1
]}

Lin, Zhi ^{[1
]}

Deng, Jiawei ^{[1
]}

Liu, Yingliang ^{[1
]}

Zhang, Li ^{[1
]}

Wang, Kunlun ^{[1
]}

Xu, Shengang ^{[1
]}

Cao, Shaokui ^{[1
]}

机构：

[1] Zhengzhou Univ, Sch Mat Sci & Engn, Henan Key Lab Adv Nylon Mat & Applicat, Zhengzhou 450001, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2022年 / 47卷 / 03期

基金：

中国国家自然科学基金;

关键词：

g-C3N4; Carbon dots; Hollow spheres; In situ calcination; Photocatalyst; Hydrogen evolution; ONE-STEP SYNTHESIS; H-2; EVOLUTION; QUANTUM DOTS; HYDROTHERMAL SYNTHESIS; DOPED G-C3N4; NITRIDE; NANOSHEETS; PERFORMANCE; FABRICATION; PHOTODEGRADATION;

D O I：

10.1016/j.ijhydene.2021.10.108

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：

In this work, a series of carbon dots (CDs) modified hollow g-C3N4 spheres (HCNS-Cx) were constructed via a double in situ approach using cyanamide and glucose as precursors, respectively. As HCNS-Cx was synthesized by one-step in situ thermal polymerization of two precursors, which could make CDs and g-C3N4 keep tight connection and increase the separation of the photogenerated electron-hole pairs. The average diameter and wall thickness of the HCNS-Cx are about 355 nm and 55 nm, respectively. Under the visible light irradiation, the H-2 evolution rate (HER) of HCNS-C1.0 (2322 mmol g(-1) h(-1)) was 19 times that of bulk g-C3N4 (122 mmol g(-1) h(-1)) and 1.8 times that of HCNS without CDs modification (1289 mmol g-1 h(-1)), respectively. And its apparent quantum efficiency is 17.93% at 420 nm. The specific surface area, light absorption capacity, and charge carrier mobility of HCNS-Cx could be dramatically improved due to the introduction of CDs and hollow structures of g-C3N4 spheres, resulting in a significant improvement of photocatalytic activity. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：1568 / 1578

页数：11