Atomically-thin Bi2MoO6 nanosheets with vacancy pairs for improved photocatalytic CO2 reduction

被引：290

作者：

Di, Jun ^{[2
]}

Zhao, Xiaoxu ^{[3
]}

Lian, Cheng ^{[4
]}

Ji, Mengxia ^{[1
]}

Xia, Jiexiang ^{[1
]}

Xiong, Jun ^{[1
]}

Zhou, Wu ^{[5
]}

Cao, Xingzhong ^{[6
]}

She, Yuanbin ^{[7
]}

Liu, Honglai ^{[4
]}

Loh, Kian Ping ^{[3
]}

Pennycook, Stephen J. ^{[3
]}

Li, Huaming ^{[1
]}

Liu, Zheng ^{[2
]}

机构：

[1] Jiangsu Univ, Inst Energy Res, Sch Chem & Chem Engn, 301 Xuefu Rd, Zhenjiang 212013, Jiangsu, Peoples R China

[2] Nanyang Technol Univ, Sch Mat Sci & Engn, Ctr Programmable Mat, Singapore 639798, Singapore

[3] Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117575, Singapore

[4] East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

[5] Univ Chinese Acad Sci, Sch Phys Sci, CAS Key Lab Vacuum Sci, Beijing 100049, Peoples R China

[6] Chinese Acad Sci, Inst High Energy Phys, Multidiscipline Res Div, Beijing 100049, Peoples R China

[7] Zhejiang Univ Technol, Coll Chem Engn, Hangzhou 310032, Zhejiang, Peoples R China

来源：

NANO ENERGY | 2019年 / 61卷

基金：

中国国家自然科学基金; 新加坡国家研究基金会;

关键词：

Bi2MoO6; Photocatalytic; CO2; reduction; Ultrathin; Vacancy pairs; NITROGEN-FIXATION; EFFICIENT; PHOTOREDUCTION;

D O I：

10.1016/j.nanoen.2019.04.029

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：

Exploring efficient strategies to increase CO2 photoreduction performance is a key challenge in the energy conversion field. Herein, a cooperative role involving an ultrathin 2D structure and surface defects is employed to design defective Bi2MoO6 ultrathin nanosheets, to boost the CO2 photoreduction activity under water with no sacrificial agent, co-catalyst or extra photosensitizer. Bi2MoO6 ultrathin nanosheets with surface "Bi-O '' vacancy pairs are grown via a template-directed strategy, as proved by STEM-ADF and positron annihilation spectroscopy. The engineered "Bi-O '' vacancy pairs tune the local atomic structure, electronic structure of Bi2MoO6 and serve as charge separation centers to boost the electron-hole separation. Meanwhile, the defective ultrathin structure favors the CO2 adsorption, activation and CO desorption processes. With the merits of atomically-thin configuration and surface defects, the defective Bi2MoO6 ultrathin nanosheets display 2.55 times improved CO formation rate than their bulk counterpart under light irradiation.

引用

页码：54 / 59

页数：6

共 29 条

[1] Enhanced performance of photoelectrochemical water oxidation using a three-dimensional interconnected nanostructural photoanode via simultaneously harnessing charge transfer and coating with an oxygen evolution catalyst [J].