Nove tehnologije
| Solarna ?elija koja se sama obnavlja |
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| Autor Iva Zelenko |
| Petak, 11 VeljaÄŤa 2011 20:08 |
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Tijekom vremena ve?ina solarnih ?elija, zbog dugotrajnog izlaganja sun?evim zrakama, degradira i postane beskorisna, a njihova zamjena i samo održavanje ?ine veliki trošak. Istraživa?ka grupa sa sveu?ilišta Purdue, u Indiani, pronašla je na?in kako upotrebom ugljikovih nanocijevi i DNK stvoriti solarnu ?eliju koja ?e se sama obnavljati. U razgovoru za Science Daily, profesor asistent strojarstva na sveu?ilištu Purdue, Jong Hyun Choi objasnio je da je njegova grupa stvorila umjetni fotosustav koriste?i opti?ke nanomaterijale kako bi prikupili solarnu energiju koja se pretvara u elektri?nu. Koriste?i biljke kao svoj izvor inspiracije, koje se same obnavljaju upotrebljavaju?i prirodni fotosinteti?ki sustav, dizajn koristi neobi?na svojstva strukture zvane jednozidne ugljikove nanocijevi. Choi, ?ija istraživa?ka grupa trenutno radi u centrima u Purdue-ovom istraživa?kom parku, kaže da ih koriste kao molekularne žice u laganim ?elijama, te smatra da takav pristup, iako je još u ranoj fazi istraživanja, nudi obe?anje za industrijalizaciju.
Fotoelektrokemijske ?elije rade na na?in da pretvaraju sun?evu svjetlost u elektri?nu energiju upotrebljavaju?i elektrolit. ?elije sadrže pigmente koji upijaju svijetlost, kromofore, molekula nalik klorofilu, koje se razgra?uju kada su izložene sun?evoj svjetlosti. Kriti?ni nedostatak konvencionalne fotoelektrokemijske ?elije je upravo ta razgradnja, izjavio je Choi. Istraživanje njegovog tima ima u cilju savladati ovu prepreku prate?i prirodni put – kontinuiranom zamjenom ošte?enih pigmenata novima. Ovakva vrsta samoobnavljanja odvija se kod biljaka svakog sata, kaže Choi. Ukoliko bi solarne ?elije bile dizajnirane da ?ine isto, mogle bi djelovati punim kapacitetom u nedogled, odnosno cijelo vrijeme dodavanja kromofora.
Izvor: inhabitat.com |
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