title: Enhanced Photoreduction CO₂ Activity over Direct Z-Scheme α-Fe₂O₃/Cu₂O Heterostructures under Visible Light Irradiation.
abstract: Hematite-cuprous oxide (α-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 is 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 μmol·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.
authors: †College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450052, China.
authors: Ji-Chao
authors: JC
authors: Wang
authors: †College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450052, China.
authors: Lin
authors: L
authors: Zhang
authors: †College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450052, China.
authors: Wen-Xue
authors: WX
authors: Fang
authors: †College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450052, China.
authors: Juan
authors: J
authors: Ren
authors: ‡Department of Chemistry, Zhengzhou Normal University, Zhengzhou 450044, China.
authors: Yong-Yu
authors: YY
authors: Li
authors: †College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450052, China.
authors: Hong-Chang
authors: HC
authors: Yao
authors: †College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450052, China.
authors: Jian-She
authors: JS
authors: Wang
authors: †College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450052, China.
authors: Zhong-Jun
authors: ZJ
authors: Li
keywords: CO2 reduction; Fe2O3/Cu2O composite photocatalyst; Z-scheme; visible-light-activated photocatalysis