Enhanced hydrogen generation using a saline catholyte in a two chamber microbial electrolysis cell

Handle URI:
http://hdl.handle.net/10754/598181
Title:
Enhanced hydrogen generation using a saline catholyte in a two chamber microbial electrolysis cell
Authors:
Nam, Joo-Youn; Logan, Bruce E.
Abstract:
High rates of hydrogen gas production were achieved in a two chamber microbial electrolysis cell (MEC) without a catholyte phosphate buffer by using a saline catholyte solution and a cathode constructed around a stainless steel mesh current collector. Using the non-buffered salt solution (68 mM NaCl) produced the highest current density of 131 ± 12 A/m3, hydrogen yield of 3.2 ± 0.3 mol H2/mol acetate, and gas production rate of 1.6 ± 0.2 m3 H2/m 3·d, compared to MECs with catholytes externally sparged with CO2 or containing a phosphate buffer. The salinity of the catholyte achieved a high solution conductivity, and therefore the electrode spacing did not appreciably affect performance. The coulombic efficiency with the cathode placed near the membrane separating the chambers was 83 ± 4%, similar to that obtained with the cathode placed more distant from the membrane (84 ± 4%). Using a carbon cloth cathode instead of the stainless steel mesh cathode did not significantly affect performance, with all reactor configurations producing similar performance in terms of total gas volume, COD removal, rcat and overall energy recovery. These results show MEC performance can be improved by using a saline catholyte without pH control. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Citation:
Nam J-Y, Logan BE (2011) Enhanced hydrogen generation using a saline catholyte in a two chamber microbial electrolysis cell. International Journal of Hydrogen Energy 36: 15105–15110. Available: http://dx.doi.org/10.1016/j.ijhydene.2011.08.106.
Publisher:
Elsevier BV
Journal:
International Journal of Hydrogen Energy
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
Nov-2011
DOI:
10.1016/j.ijhydene.2011.08.106
Type:
Article
ISSN:
0360-3199
Sponsors:
This study was supported by the National Renewable Energy Laboratory (NREL) and the King Abdullah University of Science and 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.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T13:14:13Zen
dc.date.available2016-02-25T13:14:13Zen
dc.date.issued2011-11en
dc.identifier.citationNam J-Y, Logan BE (2011) Enhanced hydrogen generation using a saline catholyte in a two chamber microbial electrolysis cell. International Journal of Hydrogen Energy 36: 15105–15110. Available: http://dx.doi.org/10.1016/j.ijhydene.2011.08.106.en
dc.identifier.issn0360-3199en
dc.identifier.doi10.1016/j.ijhydene.2011.08.106en
dc.identifier.urihttp://hdl.handle.net/10754/598181en
dc.description.abstractHigh rates of hydrogen gas production were achieved in a two chamber microbial electrolysis cell (MEC) without a catholyte phosphate buffer by using a saline catholyte solution and a cathode constructed around a stainless steel mesh current collector. Using the non-buffered salt solution (68 mM NaCl) produced the highest current density of 131 ± 12 A/m3, hydrogen yield of 3.2 ± 0.3 mol H2/mol acetate, and gas production rate of 1.6 ± 0.2 m3 H2/m 3·d, compared to MECs with catholytes externally sparged with CO2 or containing a phosphate buffer. The salinity of the catholyte achieved a high solution conductivity, and therefore the electrode spacing did not appreciably affect performance. The coulombic efficiency with the cathode placed near the membrane separating the chambers was 83 ± 4%, similar to that obtained with the cathode placed more distant from the membrane (84 ± 4%). Using a carbon cloth cathode instead of the stainless steel mesh cathode did not significantly affect performance, with all reactor configurations producing similar performance in terms of total gas volume, COD removal, rcat and overall energy recovery. These results show MEC performance can be improved by using a saline catholyte without pH control. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.en
dc.description.sponsorshipThis study was supported by the National Renewable Energy Laboratory (NREL) and the King Abdullah University of Science and Technology (KAUST) (Award KUS-I1-003-13).en
dc.publisherElsevier BVen
dc.subjectBufferen
dc.subjectCarbon dioxide additionen
dc.subjectCatholyte pHen
dc.subjectHydrogenen
dc.subjectMicrobial electrolysis cellsen
dc.subjectSodium chlorideen
dc.titleEnhanced hydrogen generation using a saline catholyte in a two chamber microbial electrolysis cellen
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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