Tungsten bronze Cs 0.33 WO 3 nanorods modified by molybdenum for improved photocatalytic CO 2 reduction directly from ai
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Published online 2 April 2020 | https://doi.org/10.1007/s40843-019-1263-1
SPECIAL ISSUE: Advanced Photocatalytic Materials
Tungsten bronze Cs0.33WO3 nanorods modified by molybdenum for improved photocatalytic CO2 reduction directly from air *
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Lian Yi, Wenhui Zhao, Yanhong Huang, Xiaoyong Wu , Jinlong Wang and Gaoke Zhang ABSTRACT Photocatalytic CO2 reduction is thought to be a promising strategy in mitigating the energy crisis and several other environmental problems. Hence, modifying or developing suitable semiconductors with high efficiency of photocatalytic CO2 reduction property has become a topic of interest to scientists. In this study, a series of Mo-modified Cs0.33WO3 tungsten bronze were prepared using a “watercontrollable releasing” solvothermal method to produce effective photocatalytic CO2 reduction performance. Interestingly, Mo atoms replaced W partially within the hexagonal crystal structure, leading to a significant increase in photocatalytic CO2 reduction activity of Cs0.33WO3. The 5% Modoped compound displayed the best performance, with the −1 −1 production yield rates of 7.5 µmol g h for CO and −1 −1 3.0 µmol g h for CH3OH under low concentration of CO2 under anaerobic conditions, which is greatly higher than those −1 −1 of pure Cs0.33WO3 (3.2 µmol g h for CO and −1 −1 1.2 µmol g h for CH3OH) and Mo-doped W18O49 −1 −1 −1 −1 (1.5 µmol g h for CO and 0 µmol g h for CH3OH). More importantly, the as-prepared Mo-doped Cs0.33WO3 series could also induce the photocatalytic reduction of CO2 directly from the air in the presence of oxygen, which is beneficial for practical applications. The superior photocatalytic performance of Mo-doped Cs0.33WO3 series over the popular reduced WO3 may be due to the increase in light absorption induced by 5+ the localized surface plasmon resonance (LSPR) effect of Mo , large improved charge separation ability, and the co-effect of Mo and Cs in crystal. This study provides a simple strategy for designing highly efficient photocatalysts in low concentration of CO2 reduction. Keywords: CO2 reduction, charge separation, Cs0.33WO3, low concentration, photocatalytic performance
INTRODUCTION Over the past few decades, our consumption of fossil fuel has grown significantly, playing an essential role in the development of industrial economy. However, the overconsumption of fossil fuels has led to resource depletion and increasing atmospheric CO2 concentration, destabilizing the natural carbon cycle [1]. From the 1970s until now, atmospheric CO2 concentration increased from 280 ppm to ca. 410 ppm, leading to severe global environmental issues such as climate change [2]. Capturing and converting atmospheric CO2 as a renewable fuel source is a promising strategy to mitigate the current global energy crisis and simultaneously reduce the adverse effects of greenhouse gas (GHG) accumulation in our atmosphere [3,4]. Photocatalytic CO2 reduction can potentially be used as a method to achieve the above objective. Under sustained solar irradiation, photocatalysts can reduce CO2 into
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