Ag/Ag₂SO₃ plasmonic catalysts with high activity and stability for CO₂ reduction with water vapor under visible light

详细信息    查看全文

• 作者：Da Wang ; Yan Yu ; Zhipeng Zhang ; Huiying Fang…
• 关键词：Ag/Ag2SO3 ; Plasmonic photocatalysts ; CO2 reduction
• 刊名：Environmental Science and Pollution Research
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：23
• 期：18
• 页码：18369-18378
• 全文大小：1,079 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499
• 卷排序：23

文摘

The conversion of CO₂ into useful raw materials for fuels and chemicals by solar energy is described using a plasmonic photocatalyst comprised of Ag supported on Ag₂SO₃ (Ag/Ag₂SO₃) fabricated by a facile solid-state ion-exchange method and subsequent reduction with hydrazine hydrate. The optimum molar ratio of Ag0/Ag+ was 5 %. Visible light irradiation (>400 nm) of the Ag/Ag₂SO₃ powder in the presence of CO₂ and water vapor led to the formation of CH₄ and CO with a quantum yield of 0.126 %, and an energy returned on energy invested of 0.156 %. The Ag/Ag₂SO₃ retained high catalytic activity after ten successive experimental cycles. The catalysts were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy with energy-dispersive X-ray analysis, UV/Vis absorption spectroscopy, and Brunauer-Emmett-Teller analyses, as well as photocurrent action spectroscopy. It is proposed that the photocatalytic activity of the catalysts is initiated by energy conversion from incident photons to localized surface plasmon resonance oscillations of silver nanoparticles. This plasmonic energy is transferred to the Ag₂SO₃ by direct electron transfer and/or resonant energy transfer, causing the separation of photogenerated electron/hole pairs.