Gas-Phase Photoelectrocatalysis for Breaking Down Nitric Oxide

被引：63

作者：

Xiao, Shuning ^{[1
,2
,3
]}

Wan, Zhe ^{[1
]}

Zhou, Jiachen ^{[1
]}

Li, Han ^{[1
]}

Zhang, Huiqiang ^{[1
]}

Su, Chenliang ^{[2
]}

Chen, Wei ^{[3
]}

Li, Guisheng ^{[1
]}

Zhang, Dieqing ^{[1
]}

Li, Hexing ^{[1
,4
]}

机构：

[1] Shanghai Normal Univ, Int Joint Lab Resource Chem SHNU NUS PU, Key Lab Resource Chem, Shanghai Key Lab Rare Earth Funct Mat,Minist Educ, Shanghai 200234, Peoples R China

[2] Shenzhen Univ, SZU NUS Collaborat Innovat Ctr Optoelect Sci & Te, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Minist Educ,Coll Optoelect Engn, Shenzhen 518060, Peoples R China

[3] Natl Univ Singapore, Dept Chem & Phys, 3 Sci Dr 3, Singapore 117543, Singapore

[4] Shanghai Univ Elect Power, 2588 Changyang Rd, Shanghai 200090, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2019年 / 53卷 / 12期

基金：

中国国家自然科学基金; 中国博士后科学基金; 新加坡国家研究基金会;

关键词：

LIGHT PHOTOCATALYTIC PERFORMANCE; AU NANOPARTICLES; OXYGEN VACANCY; BI METAL; NO; TIO2; EFFICIENT; CATALYSTS; NANOCOMPOSITES; SEMICONDUCTOR;

D O I：

10.1021/acs.est.9b00986

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Photoelectrocatalysis (PEC) produces high-efficiency electron-hole separation by applying a bias voltage between semiconductor-based electrodes to achieve high photocatalytic reaction rates. However, using PEC to treat polluted gas in a gas-phase reaction is difficult because of the lack of a conductive medium. Herein, we report an efficient PEC system to oxidize NO gas by using parallel photoactive composites (TiO2 nanoribbons-carbon nanotubes) coated on stainless-steel mesh as photoanodes in a gas-phase chamber and Pt foil as the working electrode in a liquid phase auxiliary cell. Carbon nanotubes (CNTs) were utilized as conductive scaffolds to enhance the interaction between TiO2 and stainless-steel skeletons for accelerated photogenerated electron transfer. Such a PEC system exhibited super-high performance for the treatment of indoor NO gas (550 ppb) with high selectivity for nitrate under UV-light irradiation owing to the conductive, intertwined network structure of the photoanode, fast photocarrier separation, and longer photogenerated hole lifetime. The photogenerated holes were proven to be the most important active sites for directly driving PEC oxidation of indoor NO gas, even in the absence of water vapor. This work created an efficient PEC air-purification filter for treating indoor polluted air under ambient conditions.

引用

页码：7145 / 7154

页数：10

共 52 条

[1] Effect of calcination temperature on the photoactivities of ZnO/SnO2 nanocomposites for the degradation of methyl orange [J].