Hydrogenophilic dechlorinating bacteria are till now known for their ability to use hydrogen as electron donor to respire chlorinated solvents. Here we show that, in the absence of chlorinated compounds to be reduced, they can also carry the reverse reaction towards hydrogen generation (from water reduction), by using a graphite electrode as direct electron donor. With the electrode potential set at -750 mV (vs. SHE), such bacteria promptly catalyzed the rate of hydrogen production, nearly 3 times more than in abiotic controls, in spite of no previous acclimation in electrochemical systems. Similar hydrogen production rates were obtained with the electrode potential set at -450 mV (vs. SHE), but in the presence of a low-potential redox mediator (methyl viologen). These results pinpoint the potential of dechlorinating bacteria as novel hydrogen catalysts for possible application in new energy technologies.

Hydrogen generation with hydrogenophilic dechlorinating bacteria in bioelectrochemical systems / Villano, M; Aulenta, Federico; DE BONIS, L; Rossetti, S; Majone, M.. - (2010). (Intervento presentato al convegno American Chemical Society (ACS) National Meeting tenutosi a San Francisco, CA; United States).

Hydrogen generation with hydrogenophilic dechlorinating bacteria in bioelectrochemical systems

AULENTA, Federico;
2010

Abstract

Hydrogenophilic dechlorinating bacteria are till now known for their ability to use hydrogen as electron donor to respire chlorinated solvents. Here we show that, in the absence of chlorinated compounds to be reduced, they can also carry the reverse reaction towards hydrogen generation (from water reduction), by using a graphite electrode as direct electron donor. With the electrode potential set at -750 mV (vs. SHE), such bacteria promptly catalyzed the rate of hydrogen production, nearly 3 times more than in abiotic controls, in spite of no previous acclimation in electrochemical systems. Similar hydrogen production rates were obtained with the electrode potential set at -450 mV (vs. SHE), but in the presence of a low-potential redox mediator (methyl viologen). These results pinpoint the potential of dechlorinating bacteria as novel hydrogen catalysts for possible application in new energy technologies.
2010
American Chemical Society (ACS) National Meeting
Dechlorination; Trichloroethylene; Organohalide respiration
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Hydrogen generation with hydrogenophilic dechlorinating bacteria in bioelectrochemical systems / Villano, M; Aulenta, Federico; DE BONIS, L; Rossetti, S; Majone, M.. - (2010). (Intervento presentato al convegno American Chemical Society (ACS) National Meeting tenutosi a San Francisco, CA; United States).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/328611
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