Detail Wooden Batteries   Oleh:  [s.n] Jenis: Article from Bulletin/Magazine Dalam koleksi: The Economist (http://search.proquest.com/) vol. 403 no. 8787 (Jun. 2012), page S8. Topik: Research; Batteries; Chemical Engineering; Pulp & Paper Mills Ketersediaan Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.72 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel The main problem with both wind and solar energy is not their cost (which is falling satisfactorily with every passing year) but their intermittency. Supplying power to the grid when the air is still or the sun is below the horizon depends on storing the surplus when the day is blustery and the sun is up. And, at the moment, this is expensive. Cheap and abundant materials for making batteries, though, might change that. Which is why a recent paper in Science, by Grzegorz Milczarek of Poznan University of Technology, in Poland, and Olle Inganas of Linkoping University, in Sweden, may prove important. The two researchers propose making one of a battery's three components, its cathode, out of the waste from paper mills. The reason Dr Milczarek and Dr Inganas thought lignin molecules might be suitable for use as cathodes was that they are rich in chemical groups called phenols, and phenols are easily turned into related groups called quinones. It is these quinones that are the crucial components. In combination with a second type of chemical called a polypyrrole, they provide just the sort of electron and proton receptors a cathode requires. Polypyrroles are not as cheap as lignin, but compared with metals they are not expensive. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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