Recently, a study published in the Journal of Sustainable Chemistry & Engineering of the American Chemical Society stated that a new design scheme can allow artificial leaves to "go out" from the laboratory to the natural environment. This improved artificial leaf The energy conversion rate of carbon dioxide is 10 times that of natural leaves.
Artificial leaves simulate photosynthesis, the process in which plants use solar energy to make carbohydrates from water and carbon dioxide in the air. However, the artificial leaves that were expected to reduce carbon dioxide emissions in the atmosphere could only work in the laboratory because they required the use of pure carbon dioxide in laboratory containers.
Meenesh Singh, the author of the research report and an associate professor at the College of Engineering at Illinois State University, said: "So far, all artificial leaf designs tested in the laboratory have used carbon dioxide in pressurized tanks. In order to successfully apply them to the natural environment, artificial Leaves need to absorb more carbon dioxide from diluted sources. "
The separation of pressurized carbon dioxide from artificial leaves means that they need to collect and concentrate the carbon dioxide in the air to promote artificial photosynthesis reactions. Meenesh Singh and colleague Aditya Prajapati solved this problem in the laboratory by encapsulating traditional artificial leaves in transparent capsules.
It is understood that transparent capsules are made of semi-permeable membranes of quaternary ammonium resin filled with water. The semi-permeable membrane of quaternary ammonium resin can make the water evaporate under the sunlight. When the water passes through the semi-permeable membrane, it will selectively absorb carbon dioxide from the air. The artificial photosynthesis device in the capsule consists of a light absorber coated with a catalyst that converts carbon dioxide into carbon monoxide, which is then siphoned out of the basic components used to make various synthetic fuels. At the same time, the process also produces oxygen for absorption by the surrounding environment.
Meenesh Singh said: "By encapsulating traditional artificial leaves in this special film, the entire device is like a natural leaf capable of photosynthesis in a natural environment."
Their calculations show that 360 artificial leaves, each 1.7 meters long and 0.2 meters wide, can produce nearly half a ton of carbon monoxide per day for synthetic fuel manufacturing. At the same time, 360 artificial leaves covering 500 square meters can reduce the carbon dioxide content of the air within 100 meters within a day by 10%.
Meenesh Singh said: "Our design uses existing materials and technologies. When combined, they can create realistic versions of artificial leaves that can be used in a natural environment outside the laboratory to play a role in reducing greenhouse gases in the atmosphere. Important role. "(Yang Yan)
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