Highly Efficient Visible Light Photocatalytic Reduction of CO2 to Hydrocarbon Fuels by Cu-Nanoparticle Decorated Graphene Oxide

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• 作者：Indrajit Shown ; Hsin-Cheng Hsu ; Yu-Chung Chang ; Chang-Hui Lin ; Pradip Kumar Roy ; Abhijit Ganguly ; Chen-Hao Wang ; Jan-Kai Chang ; Chih-I Wu ; Li-Chyong Chen ; Kuei-Hsien Chen
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：November 12, 2014
• 年：2014
• 卷：14
• 期：11
• 页码：6097-6103
• 全文大小：425K
• ISSN：1530-6992

文摘

The production of renewable solar fuel through CO₂ photoreduction, namely artificial photosynthesis, has gained tremendous attention in recent times due to the limited availability of fossil-fuel resources and global climate change caused by rising anthropogenic CO₂ in the atmosphere. In this study, graphene oxide (GO) decorated with copper nanoparticles (Cu-NPs), hereafter referred to as Cu/GO, has been used to enhance photocatalytic CO₂ reduction under visible-light. A rapid one-pot microwave process was used to prepare the Cu/GO hybrids with various Cu contents. The attributes of metallic copper nanoparticles (鈭?鈥? nm in size) in the GO hybrid are shown to significantly enhance the photocatalytic activity of GO, primarily through the suppression of electron鈥揾ole pair recombination, further reduction of GO鈥檚 bandgap, and modification of its work function. X-ray photoemission spectroscopy studies indicate a charge transfer from GO to Cu. A strong interaction is observed between the metal content of the Cu/GO hybrids and the rates of formation and selectivity of the products. A factor of greater than 60 times enhancement in CO₂ to fuel catalytic efficiency has been demonstrated using Cu/GO-2 (10 wt % Cu) compared with that using pristine GO.

Keywords:

graphene oxide; copper nanoparticle; photocatalyst; CO₂ photoreduction; solar fuel; artificial photosynthesis