Enhanced Photoreduction CO2 Activity over Direct Z-Scheme α-Fe2O3/Cu2O Heterostructures under Visible Light Irradiation

被引：326
|
作者：
Wang, Ji-Chao [1 ]
Zhang, Lin [1 ]
Fang, Wen-Xue [1 ]
Ren, Juan [1 ]
Li, Yong-Yu [2 ]
Yao, Hong-Chang [1 ]
Wang, Jian-She [1 ]
Li, Zhong-Jun [1 ]
机构：
[1] Zhengzhou Univ, Coll Chem & Mol Engn, Zhengzhou 450052, Peoples R China
[2] Zhengzhou Normal Univ, Dept Chem, Zhengzhou 450044, Peoples R China
来源：
ACS APPLIED MATERIALS & INTERFACES | 2015年 / 7卷 / 16期
关键词：
CO2; reduction; Fe2O3/Cu2O composite photocatalyst; visible-light-activated photocatalysis; Z-scheme; CARBON-DIOXIDE; PHOTOCATALYTIC REDUCTION; CONVERSION; WATER; TIO2; SEMICONDUCTOR; DEGRADATION; PERFORMANCE; OXIDATION; SPECTRA;
D O I：
10.1021/acsami.5b00822
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Hematite-cuprous oxide (alpha-Fe2O3/Cu2O) nanocomposites are synthesized based on the design of Z-scheme photocatalyst for CO2 reduction. The band structure for the typical Fe2O3/Cu2O (with 1:1 mole ratio) is characterized by UV-vis reflectance spectroscopy and X-ray/ultraviolet photoelectron spectroscopy; and its heterojunction determined to be Type II band alignment. The photoreduction CO2 activities of the heterostructures are investigated in the presence of water vapor. The CO yields are changed with Fe/Cu Mole ratio, and the maximal CO yield attains 5.0 mu mol.g cat(-1) after 3 h of visible-light irradiation. Besides the effect of light wavelength, H2O/CO2 molar ratio and temperature on the products is studied. The selectivity of the prepared catalysts is tunable by modulating the light wavelength. The reaction mechanism is proposed and further confirmed experimentally. The results gained herein may provide some insights into the design of Z-scheme photocatalysts for CO2 reduction.
引用
收藏
页码：8631 / 8639
页数：9
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