According to a report recently organized by the Physicist Organization Network, Swedish scientists use the waste from the paper industry to create cathodes for solar cells, which can use a smarter and cheaper method to store solar energy, allowing people to continue to obtain cheaper solar cells and wind turbines. electricity. Research papers are published in the journal Science. Traditional batteries use metal oxides to conduct electricity, but these metal materials are very scarce; while organic solar cells made of conductive plastics are cost-effective and high-performance enough for commercial production, they have a competitive advantage. However, solar energy must be To store electricity generated from early to late, the electricity generated by wind turbines must also be stored until the day when there is no wind, so scientists have been using cheap and renewable materials to make cathodes for batteries. The lead author of the latest study, a member of the Royal Swedish Academy of Sciences and professor of biomolecules and organic electronics at the University of Linköping in Sweden, said: “In fact, nature has already provided us with a solution.†Inkanas derives his inspiration from the photosynthesis process of plants. In photosynthesis, the sun's charged electrons are transported by anthraquinones, which are very electrochemically active, and terpenoids are molecules that consist of a benzene ring containing six carbon atoms. Inspired by this inspiration, Incanas chose brown liquid, a by-product of the pulp manufacturing process, as a raw material for the manufacture of battery cathodes. This brown liquid consists mainly of lignin, a biopolymer that is located within the plant cell wall. Then, Inganas and Polish colleague Zeegez Milenzarak designed a thickness of only 0.5 micron using a pyrrole (a five-fold heterocyclic mixture) and lignin extracted from a brown liquid. A 1 micron (millionths of a meter) film is used as the cathode of the battery to transport the charged charge in the battery. Scientists said that the latest method can continuously store the electricity generated by batteries without having to build a large grid. Inkanas said: “This new energy storage method using cheap, recyclable raw materials remains to be further studied. From 20% to 30% of the biomass contained in a tree is lignin, which is a constant source of The source of the material." (Liu Xia)
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