Comparison of microbial electrolysis cells operated with added voltage or by setting the anode potential

Handle URI:
http://hdl.handle.net/10754/597814
Title:
Comparison of microbial electrolysis cells operated with added voltage or by setting the anode potential
Authors:
Nam, Joo-Youn; Tokash, Justin C.; Logan, Bruce E.
Abstract:
Hydrogen production in a microbial electrolysis cell (MEC) can be achieved by either setting the anode potential with a potentiostat, or by adding voltage to the circuit with a power source. In batch tests the largest total gas production (46 ± 3 mL), lowest energy input (2.3 ± 0.3 kWh/m 3 of H2 generated), and best overall energy recovery (E+S = 58 ± 6%) was achieved at a set anode potential of EAn = -0.2 V (vs Ag/AgCl), compared to set potentials of -0.4 V, 0 V and 0.2 V, or an added voltage of Eap = 0.6 V. Gas production was 1.4 times higher with EAn = -0.2 V than with Eap = 0.6 V. Methane production was also reduced at set anode potentials of -0.2 V and higher than the other operating conditions. Continuous flow operation of the MECs at the optimum condition of EAn = -0.2 V initially maintained stable hydrogen gas production, with 68% H2 and 21% CH4, but after 39 days the gas composition shifted to 55% H2 and 34% CH 4. Methane production was not primarily anode-associated, as methane was reduced to low levels by placing the anode into a new MEC housing. These results suggest that MEC performance can be optimized in terms of hydrogen production rates and gas composition by setting an anode potential of -0.2 V, but that methanogen proliferation must be better controlled on non-anodic surfaces. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Citation:
Nam J-Y, Tokash JC, Logan BE (2011) Comparison of microbial electrolysis cells operated with added voltage or by setting the anode potential. International Journal of Hydrogen Energy 36: 10550–10556. Available: http://dx.doi.org/10.1016/j.ijhydene.2011.05.148.
Publisher:
Elsevier BV
Journal:
International Journal of Hydrogen Energy
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
Aug-2011
DOI:
10.1016/j.ijhydene.2011.05.148
Type:
Article
ISSN:
0360-3199
Sponsors:
This study was supported by the National Renewable EnergyLaboratory (NREL) and the King Abdullah University of Scienceand Technology (KAUST) (Award KUS-I1-003-13).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorNam, Joo-Younen
dc.contributor.authorTokash, Justin C.en
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T12:57:10Zen
dc.date.available2016-02-25T12:57:10Zen
dc.date.issued2011-08en
dc.identifier.citationNam J-Y, Tokash JC, Logan BE (2011) Comparison of microbial electrolysis cells operated with added voltage or by setting the anode potential. International Journal of Hydrogen Energy 36: 10550–10556. Available: http://dx.doi.org/10.1016/j.ijhydene.2011.05.148.en
dc.identifier.issn0360-3199en
dc.identifier.doi10.1016/j.ijhydene.2011.05.148en
dc.identifier.urihttp://hdl.handle.net/10754/597814en
dc.description.abstractHydrogen production in a microbial electrolysis cell (MEC) can be achieved by either setting the anode potential with a potentiostat, or by adding voltage to the circuit with a power source. In batch tests the largest total gas production (46 ± 3 mL), lowest energy input (2.3 ± 0.3 kWh/m 3 of H2 generated), and best overall energy recovery (E+S = 58 ± 6%) was achieved at a set anode potential of EAn = -0.2 V (vs Ag/AgCl), compared to set potentials of -0.4 V, 0 V and 0.2 V, or an added voltage of Eap = 0.6 V. Gas production was 1.4 times higher with EAn = -0.2 V than with Eap = 0.6 V. Methane production was also reduced at set anode potentials of -0.2 V and higher than the other operating conditions. Continuous flow operation of the MECs at the optimum condition of EAn = -0.2 V initially maintained stable hydrogen gas production, with 68% H2 and 21% CH4, but after 39 days the gas composition shifted to 55% H2 and 34% CH 4. Methane production was not primarily anode-associated, as methane was reduced to low levels by placing the anode into a new MEC housing. These results suggest that MEC performance can be optimized in terms of hydrogen production rates and gas composition by setting an anode potential of -0.2 V, but that methanogen proliferation must be better controlled on non-anodic surfaces. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.en
dc.description.sponsorshipThis study was supported by the National Renewable EnergyLaboratory (NREL) and the King Abdullah University of Scienceand Technology (KAUST) (Award KUS-I1-003-13).en
dc.publisherElsevier BVen
dc.subjectBoosted poweren
dc.subjectEnergy inputen
dc.subjectHydrogenen
dc.subjectMethaneen
dc.subjectMicrobial electrolysis cellen
dc.subjectSet anode potentialen
dc.titleComparison of microbial electrolysis cells operated with added voltage or by setting the anode potentialen
dc.typeArticleen
dc.identifier.journalInternational Journal of Hydrogen Energyen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
kaust.grant.numberKUS-I1-003-13en
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