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Final published version
Enzymes operating in environmental media are of immense biotechnological interest, in particular, for sustainable energy production. Here, we show that the K316 N/D500G mutant of CotA laccase from Bacillus licheniformis operates in basic media and seawater, electrocatalyzing O 2 reduction from 0.59 V, pH 8. CotA mutant's T1Cu center exhibits a formal potential of 0.56 V, consistent with an onset of bioelectrocatalytic reduction of O 2 . A photoelectrochemical cell recycling H 2 O/O 2 by a semiconductor photoanode and CotA mutant biocathode produced 41 and 11 μW cm 2 , in buffer and seawater, respectively, at pH 8, (electricity production being limited solely by the photoanode performance, reaching 240 and 220 μW cm −2 in a Zn-biobattery design), suggesting a prospective enzyme application for clean and sustainable production of electricity from seawater and oxygen.
Original language | English |
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Journal | ChemElectroChem |
Volume | 6 |
Issue | 7 |
Pages (from-to) | 2043-2049 |
Number of pages | 7 |
ISSN | 2196-0216 |
DOIs | |
Publication status | Published - 2019 |
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ID: 151209209