Ultrathin Bi4O5Br2 nanosheets for selective photocatalytic CO2 conversion into CO

By Yang Bai, Ping Yang, Li Wang, Bo Yang, Haiquan Xie, Ying Zhou, Liqun Ye. Chemical Engineering Journal, 2019

141 citations recorded by the source corpus.

Abstract The ultrathin two-dimensional materials with the unique catalytic performance attract extensive interests of researchers. In this paper, ultrathin Bi4O5Br2 nanosheet (Bi4O5Br2-UN) is synthesized through precursor method by controlling the mole ratio of Bi(NO3)3·5H2O and cetyltrimethyl ammonium bromide. The ultrathin structure of Bi4O5Br2-UN was confirmed by X-ray diffraction, atomic force miscroscopy and high-resolution transmission electron microscopy. UV–vis light irradiation, Bi4O5Br2-UN display excellent selective photocatalytic activity for CO2 conversion, which also was proved by isotope experiment. After 2 h reaction, the CO generation over Bi4O5Br2-UN reached 63.13 μmol g−1, which is about 2.3 times higher than that of bulk Bi4O5Br2 (27.56 μmol g−1). Additionally, the CO selectivity of Bi4O5Br2-UN is more than 99.5% in the whole catalytic process. The enhanced CO2 adsorption, suitable band position and improved charge separation induce the outstanding photocatalytic performance of Bi4O5Br2-UN. The photocatalytic mechanism of CO2 conversion with Bi4O5Br2-UN was analyzed by the in situ Fourier transform infrared spectrometry (FT-IR).

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/7f1114ba0c47c9e1be1f4052dbcf8a6296a2efdc