Bringing high-rate, CO2-based microbial electrosynthesis closer to practical implementation through improved electrode design and operating conditions

Jourdin, Ludovic, Freguia, Stefano, Flexer, Victoria and Keller, Jurg (2016) Bringing high-rate, CO2-based microbial electrosynthesis closer to practical implementation through improved electrode design and operating conditions. Environmental Science and Technology, 50 4: 1982-1989. doi:10.1021/acs.est.5b04431


Author Jourdin, Ludovic
Freguia, Stefano
Flexer, Victoria
Keller, Jurg
Title Bringing high-rate, CO2-based microbial electrosynthesis closer to practical implementation through improved electrode design and operating conditions
Formatted title
Bringing high-rate, CO2-based microbial electrosynthesis closer to practical implementation through improved electrode design and operating conditions
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 1520-5851
0013-936X
Publication date 2016-02-16
Year available 2016
Sub-type Article (original research)
DOI 10.1021/acs.est.5b04431
Open Access Status Not Open Access
Volume 50
Issue 4
Start page 1982
End page 1989
Total pages 8
Place of publication Washington, DC United States
Publisher American Chemical Society
Collection year 2017
Language eng
Formatted abstract
The enhancement of microbial electrosynthesis (MES) of acetate from CO2 to performance levels that could potentially support practical implementations of the technology must go through the optimization of key design and operating conditions. We report that higher proton availability drastically increases the acetate production rate, with pH 5.2 found to be optimal, which will likely suppress methanogenic activity without inhibitor addition. Applied cathode potential as low as −1.1 V versus SHE still achieved 99% of electron recovery in the form of acetate at a current density of around −200 A m–2. These current densities are leading to an exceptional acetate production rate of up to 1330 g m–2 day–1 at pH 6.7. Using highly open macroporous reticulated vitreous carbon electrodes with macropore sizes of about 0.6 mm in diameter was found to be optimal for achieving a good balance between total surface area available for biofilm formation and effective mass transfer between the bulk liquid and the electrode and biofilm surface. Furthermore, we also successfully demonstrated the use of a synthetic biogas mixture as carbon dioxide source, yielding similarly high MES performance as pure CO2. This would allow this process to be used effectively for both biogas quality improvement and conversion of the available CO2 to acetate.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Advanced Water Management Centre Publications
 
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