Study of electrogenic algae attachment to biophotovoltaic cell electrode materials
Author
Herrero Medina, Zaida Nair
Term
4. term
Education
Publication year
2018
Submitted on
2018-06-01
Pages
66
Abstract
Biophotovoltaiske celler er enheder, der udnytter fotoautotrofe mikroorganismer (organismer der bruger sollys til at lave deres egen næring) til at omdanne elektroner fra fotosyntesen til elektricitet. Formålet med dette projekt var at afprøve forskellige elektrodeoverflader for effektivt at fastholde (immobilisere) mikroalgen Scenedesmus sp. og cyanobakterien Synechocystis PCC6803 for at forbedre strømproduktionen. Overflader af guld og glaskulstof blev modificeret med forskellige overfladekemiske metoder. Den mest effektive metode var at danne et hydrogel ved krydsbinding af polyethylenimin (PEI) med poly(ethylen glycol) (200) diglycidyl ether (PEDGE), hvilket gav en høj grad af immobilisering af de fotosyntetiske mikroorganismer. De immobiliserede celler blev karakteriseret med elektrokemiske målinger og mikroskopi. Direkte elektronoverførsel blev ikke observeret for Synechocystis, men begge organismer genererede strøm på cirka 10 μA/cm2 via medieret elektronoverførsel (hvor opløste molekyler fungerer som ”shuttles” for elektroner).
Biophotovoltaic cells are devices that use photoautotrophic microorganisms (organisms that use sunlight to make their own food) to turn electrons from photosynthesis into electricity. This project tested different electrode surfaces to efficiently immobilize (anchor in place) the microalga Scenedesmus sp. and the cyanobacterium Synechocystis PCC6803 in order to improve current generation. Gold and glassy carbon electrodes were modified using various surface-chemistry treatments. The most effective approach formed a hydrogel by crosslinking polyethylenimine (PEI) with poly(ethylene glycol) (200) diglycidyl ether (PEDGE), which achieved high retention of the photosynthetic cells on the electrodes. The immobilized cells were characterized by electrochemical measurements and microscopy. Although no direct electron transfer was observed for Synechocystis, both microorganisms produced currents of about 10 μA/cm2 through mediated electron transfer (using soluble molecules to shuttle electrons).
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