Mechanism of Photocatalytic CO2 Reduction by Bismuth-Based Perovskite Nanocrystals at the Gas-Solid Interface

Sumit S. Bhosale, Aparna K. Kharade, Effat Jokar, Amir Fathi, Sue-Min Chang, Wei-Guang Diau*

*此作品的通信作者

研究成果: Article同行評審

108 引文 斯高帕斯(Scopus)

摘要

We report here a series of nontoxic and stable bismuth-based perovskite nanocrystals (PeNCs) with applications for photocatalytic reduction of carbon dioxide to methane and carbon monoxide. Three bismuth-based PeNCs of general chemical formulas A3Bi2I9, in which cation A+ = Rb+ or Cs+ or CH3NH3 + (MA+), were synthesized with a novel ultrasonication top-down method. PeNC of Cs3Bi2I9 had the best photocatalytic activity for the reduction of CO2 at the gas-solid interface with formation yields 14.9 μmol g-1 of methane and 77.6 μmol g-1 of CO, representing a much more effective catalyst than TiO2 (P25) under the same experimental conditions. The products of the photocatalytic reactions were analyzed using a gas chromatograph coupled with a mass spectrometer. According to electron paramagnetic resonance and diffuse-reflectance infrared spectra, we propose a reaction mechanism for photoreduction of CO2 via Bi-based PeNC photocatalysts to form CO, CH4, and other possible side products.

原文English
頁(從 - 到)20434-20442
頁數9
期刊Journal of the American Chemical Society
141
發行號51
DOIs
出版狀態Published - 26 12月 2019

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