Ag quantum dots modified hierarchically porous and defective TiO2 nanoparticles for improved photocatalytic CO2 reduction

被引：133

作者：

Li, Guohui ^{[1
]}

Sun, Yuanyuan ^{[1
]}

Zhang, Qingming ^{[2
]}

Gao, Zhe ^{[3
]}

Sun, Wei ^{[1
]}

Zhou, Xiaoxia ^{[2
]}

机构：

[1] Hainan Normal Univ, Coll Chem & Chem Engn, Key Lab Laser Technol & Optoelect Funct Mat Haina, Key Lab Funct Mat & Photoelectrochem Haikou, Haikou 571158, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, 1295 Dingxi Rd, Shanghai 200050, Peoples R China

[3] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan South Rd 27, Taiyuan 030001, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2021年 / 410卷

基金：

上海市自然科学基金; 中国国家自然科学基金;

关键词：

Hierarchically porous TiO2; Ag quantum dots; Defective; Photocatalytic CO2 reduction;

D O I：

10.1016/j.cej.2020.128397

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Photocatalytic reduction of CO2 into high added-value chemical products has received special attention. Herein, we designed a novel hierarchically porous and defective TiO2 modified by Ag quantum dots via a hydrothermal process assisted with organic surfactant and subsequently in-situ photodeposition method. The obtained Ag quantum dots modified TiO2 (Ag/TiO2) shows excellent and stable photocatalytic activity in CO2 reduction. In addition, the competing H-2 evolution can be completely suppressed. The super photocatalytic activity can be ascribed to the design of hierarchically porous, the intrinsic defects in TiO2, the localized surface plasmon resonance of Ag and the synergetic effect between Ag quantum dots and defective TiO2, which jointly improves the CO2 adsorption performance, enhances visible light absorption capacity and accelerates the separation of photogenerated charges. This work may provide a strategy to design and synthesis defective and hierarchically porous metal oxides for photocatalytic CO2 reduction.

引用

页数：8

共 36 条

[1] Encapsulation of Ru nanoparticles: Modifying the reactivity toward CO and CO2 methanation on highly active Ru/TiO2 catalysts [J].