Decorating g-C3N4 with alkalinized Ti3C2 MXene for promoted photocatalytic CO2 reduction performance

被引:233
作者
Tang, Qijun [1 ,2 ]
Sun, Zhuxing [3 ]
Deng, Shuang [4 ]
Wang, Haiqiang [1 ,2 ]
Wu, Zhongbiao [1 ,2 ]
机构
[1] Zhejiang Univ, Key Lab Environm Remediat & Ecol Hlth, Minist Educ, Coll Environm & Resources Sci, Hangzhou 310058, Peoples R China
[2] Zhejiang Prov Engn Res Ctr Ind Boiler & Furnace F, Hangzhou 311202, Peoples R China
[3] Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, Shanghai 200240, Peoples R China
[4] Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China
基金
中国国家自然科学基金;
关键词
Photocatalytic CO2 reduction; Alkalized Ti3C2; MXenes; g-C3N4; CHARGE-TRANSFER; EXCITON DISSOCIATION; CARBON-DIOXIDE; PHOTOREDUCTION; METAL; COMPOSITE; NITRIDE; WATER; TIO2; CONSTRUCTION;
D O I
10.1016/j.jcis.2019.12.091
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 reduction of carbon dioxide (CO2) under visible light irradiation for producing high-value fuel has attracted tremendous attention in recent years. In this study, titanium carbide MXene (Ti3C2) was used as a noble metal-free co-catalyst by simply mixing graphitic carbon nitride (g-C3N4) and alkalized Ti3C2. The carbon monoxide evolution rate of the optimized composite (5%TCOH-CN) from photocatalytic reduction of CO2 was 5.9 times higher than that of pure g-C3N4. Alkalized Ti3C2 was responsible for the superior photocatalytic activity due to its excellent electrical conductivity and large CO2 adsorption capacity. Furthermore, the separation of the photo-induced electron-hole pairs was greatly enhanced because of the large Fermi level difference between alkalized Ti3C2 and pure g-C3N4. This work demonstrates the potential of MXenes as noble metal-free co-catalyst for photocatalysis processes such as carbon dioxide reduction reaction and nitrogen reduction reaction. (C) 2019 Elsevier Inc. All rights reserved.
引用
收藏
页码:406 / 417
页数:12
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