化学
光催化
铋
甲烷
一氧化碳
钙钛矿(结构)
催化作用
反应机理
纳米晶
无机化学
电子顺磁共振
材料科学
分析化学(期刊)
光化学
纳米技术
有机化学
核磁共振
物理
作者
Sumit S. Bhosale,Aparna K. Kharade,Efat Jokar,Amir Fathi,Sue-min Chang,Eric Wei Guang Diau
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.
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