Molecular adsorption promotes carrier migration: Key step for molecular oxygen activation of defective Bi4O5I2

被引：111

作者：

Jin, Xiaoli ^{[1
]}

Lv, Chade ^{[1
]}

Zhou, Xin ^{[1
]}

Zhang, Congmin ^{[1
]}

Meng, Qingqiang ^{[1
]}

Liu, Yue ^{[1
]}

Chen, Gang ^{[1
]}

机构：

[1] Harbin Inst Technol, MIIT Key Lab Crit Mat Technol New Energy Convers, Sch Chem & Chem Engn, Harbin, Heilongjiang, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2018年 / 226卷

关键词：

Oxygen vacancies; Bi4O5I2; Molecular adsorption; Carrier migration; Molecular oxygen activation; VISIBLE-LIGHT; 001; FACETS; PHOTOCATALYTIC PERFORMANCE; BIOBR NANOSHEETS; RICH; REDUCTION; SURFACE; DEGRADATION; TIO2(110); VACANCIES;

D O I：

10.1016/j.apcatb.2017.12.008

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：

Oxide defect engineering in semiconductors is of growing interest and considered as an important strategy for promoting photocatalytic performance, as it enables to couple solar energy into oxygen activation. Herein, the surface oxygen vacancies are introduced into bismuth-rich Bi4O5I2 nanosheets (Bi4O5I2-OV) via a facile solvothermal route. By introducing oxygen vacancies into Bi4O5I2, the molecule oxygen adsorption is significantly improved. More importantly, attributed to the molecular oxygen adsorption, an instantaneous surface-bulk homojunction is constructed, which facilitates the separation and transport of photogenerated charge carriers. Therefore, noticeable molecular oxygen activation and N-2 fixation are achieved in Bi4O5I2-OV. These findings may shed light on designing highly efficient photocatalysts and provide fresh insights into understanding the charge migration mechanism in oxygen vacancies-related photocatalytic system.

引用

页码：53 / 60

页数：8

共 44 条

[1] Synthesis of hierarchical bismuth-rich Bi4O5BrxI2-x solid solutions for enhanced photocatalytic activities of CO2 conversion and Cr(VI) reduction under visible light [J].