4.6 Article

High-efficiency photoreduction of CO2 in a low vacuum

期刊

PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 24, 期 25, 页码 15389-15396

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2cp00269h

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资金

  1. Youth Innovation Promotion Association of the Chinese Academy of Sciences [2019374]
  2. Chongqing technological innovation and application development program [cstc2018jszx-cyztzx0200, cstc2021jcyj-msxmX1015]
  3. Key Scientific Research Project of China Tobacco Yunnan Industrial Co., Ltd [2019XY02]
  4. National Natural Science Foundation of China [51902357]
  5. Natural Science Foundation of Guangdong Province [2019A1515012143]
  6. Sun Yat-sen University [38000-18841209]
  7. Fundamental Research Funds for the Central Universities [19lgpy153]

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The research demonstrates that photocatalytic CO2 reduction in a low vacuum can significantly improve the CH4 yield, showing long-term stability and good cycling performance under such conditions. Enhanced CO2 photoreduction in a low vacuum results from improved accumulation of photogenerated electrons, reduced Brownian movement of gas molecules, and hindered active site-blocking by gas molecules.
Photoreduction of CO2 into CO, CH4 or hydrocarbons is attractive, due to environmental compatibility and economic feasibility. Optimizing the reaction engineering of CO2 reduction is an effective and general strategy that should be given special consideration. In this article, the photocatalytic CO2 reduction performances are originally investigated in a low vacuum in both dilute (10%) and pure CO2. We discover that the CH4 yield increased above one hundred times as the vacuum degree increased from barometric pressure to -80 kPa in dilute CO2. It also reveals long-term stability and good cycling performance in a low vacuum. The enhanced CO2 photoreduction performance in a low vacuum comes from better accumulation of photogenerated electrons, less intense Brownian movement of gas molecules in the environment and hindrance of the active site-blocking of gas molecules in the environment. Improved photocatalytic CO2 reduction in a low vacuum is further verified by Pt-TiO2 catalysts. This research presents a general route for producing clean fuels by photocatalytic CO2 reduction in a more effective way.

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