One of the haze problems in northern China is due to the burning of leaves, but now this situation can be improved, that is, the leaves can be converted into energy storage equipment.
Many streets in China are planted with Paulownia trees, and sometimes they are also called sycamore trees. Although the Chinese government banned, but the locals still burned leaves, this behavior worsened the air pollution problem. In Beijing alone, about two million tons of fallen leaves and plant waste are burned every year.
Professor Ma Hongfang from Qilu University of Technology and his colleagues have now solved how to turn the leaves of the plane trees into organic capacitors. The leaves can store energy like batteries, but also to avoid the above air pollution problems. “It is true that the process of making this organic capacitor will release a small amount of carbon dioxide, but not as much as the same amount of material is burning or decaying,” says Caroline of Pennsylvania State University. It is a good thing to use waste materials. “Researchers first clean and dry the leaves, then grind them into fine powder. The powders were then scattered in water and the mixture of powder and water was heated at a temperature of 220 ° C for 12 hours, followed by dust and contaminants. This process resulted in brown powder of carbon microspheres.
Expand the pores
Microspheres are added to the potassium hydroxide solution and heated again to 800 ° C to corrode the surface, leaving the black powder covering the tiny pores. These pores make the microspheres have a high surface area, so that the capacitor can store more energy.
Pennsylvania State University’s Fred Cannon said: “The conversion of biomass into a capacitor is not new, others have done a similar thing, The However, in the test, the decapitation-based device proved to be a supercapacitor, and more energy than a similar coal-made capacitor could store.
Despite this feature, the researchers believe that because of the varied characteristics of the leaves, it is difficult to commercialize the project.
Researchers say: “Deciduous leaves are not consistent with their traits, so I guess the characteristics of supercapacies made from fallen leaves are also varied.”
<tdpole pedigree compiles newscientist, Translator Xiao Zhao, reproduced must be authorized