The importance of OH− transport through anion exchange membrane in microbial electrolysis cells

In two-chamber microbial electrolysis cells (MECs) with anion exchange membranes (AEMs), a phosphate buffer solution (PBS) is typically used to avoid increases in catholyte pH as Nernst equation calculations indicate that high pHs adversely impact electrochemical performance. However, ion transport...

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Bibliographic Details
Published in:International journal of hydrogen energy 2018-02, Vol.43 (5), p.2645-2653
Main Authors: Ye, Yaoli, Logan, Bruce E.
Format: Article
Language:English
Subjects:
Anion exchange membrane
Anolyte pH
Buffer retention
Hydrogen
Microbial electrolysis cell
Polymeric buffer
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Summary:In two-chamber microbial electrolysis cells (MECs) with anion exchange membranes (AEMs), a phosphate buffer solution (PBS) is typically used to avoid increases in catholyte pH as Nernst equation calculations indicate that high pHs adversely impact electrochemical performance. However, ion transport between the chambers will also impact performance, which is a factor not included in those calculations. To separate the impacts of pH and ion transport on MEC performance, a high molecular weight polymer buffer (PoB), which was retained in the catholyte due to its low AEM transport and cationic charge, was compared to PBS in MECs and abiotic electrochemical half cells (EHCs). In MECs, catholyte pH control was less important than ion transport. MEC tests using the PoB catholyte, which had a higher buffer capacity and thus maintained a lower catholye pH (
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2017.12.074