Green ideas # 15 quando le auto elettriche andranno a gusci d uovoPresentation Transcript
Green Ideas #15:Quando le auto elettricheandranno a gusci d’uovo “Ideario” per un futuro sostenibile…
Uno dei problemi delle auto elettriche è la capacità di ricarica:senza condensatori sufficientemente efficienti, “fare il pieno” èun’operazione lunga e logisticamente impegnativa.Sembra che gli scienziati abbiano trovato una soluzione: i guscid’uovo. La loro microstruttura li renderebbe, dopo una tostatura a800 gradi, perfetti condensatori. Per fare un esempio: con uncondensatore a gusci, un cellulare si ricaricherebbe da zero in 45secondi. Resta solo da capire come integrarli nelle batterie.(segue articolo originale in lingua inglese)
The Electric Car Of The Future Will Be Powered By EggshellsIt’s a question that’s puzzled electric car makers for decades--how do youeffectively store enough electrical energy that will power them over longdistances?Turns out, it might be as simple as making an omelet.Batteries store the bulk of the electrical energy that powers electric vehiclestoday, but they’re limited by how quickly they wear out.Batteries are helped along by capacitors--electrical devices that charge upand drain quickly and can be recharged over and over again, but holdcomparatively much less charge.So for some years now, the hunt’s been on for an ideal crossbreed of batteriesand capacitors--an electrical device that will store a lot of charge, like a deepbowl of soup, but is also swift to fill up and drain.Scientists found it--they just had to break a few eggs.
That’s because, it turns out, chicken eggshells may offer a solution.A group of Canadian scientists have tested and shown that the membranesfrom eggshells, toasted to 800 degrees, make for surprisingly efficientsupercapacitors that could one day be used in electric vehicles, maybe evenin cell phone and laptops."What we were able to achieve is [a capacitor] that looks a lot more battery-esque," said David Mitlin, the lead on the eggs-periment. "What we showed isour material can hold three times as much charge as activated carbon butlast just as long."That’s three to four times as much charge as a commercial electrode.And, unlike expensive carbon nanotubes and graphene sheets that are alsobeing turned into capacitors, eggshells are usually thrown away as trash."People will actually pay us to take them away." Mitlin says.It has to do with the atomic and microstructure of the heated eggshellmembranes. The membrane’s chock full of nitrogen groups which can soak upand store extra charge. Plus, the interconnected mesh of carbon fibers makefor a great conducting highway, letting the charge flow in and out of thecapacitor rapidly.
Oddly enough, other chicken bits have been found to be suited to the task ofenergy storage.A little over years ago, scientists at the University of Delaware discovered thatroasted chicken feathers made great hydrogen storage materials for fuelcells, again, because of their unique porous micro architecture.Mitlin’s group has plans to develop their discovery towards commercialapplication. After all, high storage capacitors in our electronics could make aworld of difference to our daily lives."If your cell phone ran on a capacitor you could charge it in 45 seconds," Mitlinsays.Just make sure your capacitor is cage free.Fonti: Italic News e Co.Exist