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High-tech electronic products made from autumn leaves
The roads in northern China are covered with Phoenix trees that produce a lot of autumn leaves in the fall. These leaves are generally burned in cold seasons and aggravate the air pollution problems of this country. Chinese researchers recently discovered a new method to convert these organic waste materials into porous carbon materials that can be used to produce advanced electronic products. @zistfan
The researchers used a multi-step but simple process to convert autumn leaves into a form that could be attached to the electrode as the active material. In the first step, the dried leaves were first powdered and then heated at 220°C for 12 hours. This operation resulted in the production of a powder composed of small carbon microspheres. Then these microspheres are placed in a potassium hydroxide solution with a sudden increase in temperature from 450 to 800 degrees Celsius.
Chemical treatment destroys the carbon surface of the microspheres and makes them highly porous. The final product is a black carbon powder, which has a very high surface due to the presence of many small pores; This high surface area gives the final product special electrical properties.
The researchers performed a series of standard electrochemical tests on the porous microspheres to determine their potential for use in electronic devices. The voltage-current curve for this material shows that this material can make an excellent capacitor. Further tests show that these materials are indeed the makers of supercapacitors with capacities as high as 367 Farads/g, which is three times higher than the values seen in some graphene supercapacitors.
Researchers are very much looking for a way to convert biomass waste into porous carbon materials for use in energy storage technology. In addition to tree leaves, they have turned potato waste, corn straw, pine wood, rice straw and other agricultural waste into carbon electrode materials; These researchers hope to improve the electrochemical properties of porous carbon materials by optimizing the process of preparation and modification of raw materials. @zistfan3
Translation: Atefeh Elsadat Mohsenzadeh
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