Environmental Science and Pollution Research

, Volume 23, Issue 22, pp 22292–22308 | Cite as

Application of gas diffusion biocathode in microbial electrosynthesis from carbon dioxide

  • Suman Bajracharya
  • Karolien Vanbroekhoven
  • Cees J.N. Buisman
  • Deepak Pant
  • David P. B. T. B. Strik
Technoeconomic Perspectives on Sustainable CO2 Capture and Utilization

Abstract

Microbial catalysis of carbon dioxide (CO2) reduction to multi-carbon compounds at the cathode is a highly attractive application of microbial electrosynthesis (MES). The microbes reduce CO2 by either taking the electrons or reducing the equivalents produced at the cathode. While using gaseous CO2 as the carbon source, the biological reduction process depends on the dissolution and mass transfer of CO2 in the electrolyte. In order to deal with this issue, a gas diffusion electrode (GDE) was investigated by feeding CO2 through the GDE into the MES reactor for its reduction at the biocathode. A combination of the catalyst layer (porous activated carbon and Teflon binder) and the hydrophobic gas diffusion layer (GDL) creates a three-phase interface at the electrode. So, CO2 and reducing equivalents will be available to the biocatalyst on the cathode surface. An enriched inoculum consisting of acetogenic bacteria, prepared from an anaerobic sludge, was used as a biocatalyst. The cathode potential was maintained at −1.1 V vs Ag/AgCl to facilitate direct and/or hydrogen-mediated CO2 reduction. Bioelectrochemical CO2 reduction mainly produced acetate but also extended the products to ethanol and butyrate. Average acetate production rates of 32 and 61 mg/L/day, respectively, with 20 and 80 % CO2 gas mixture feed were achieved with 10 cm2 of GDE. The maximum acetate production rate remained 238 mg/L/day for 20 % CO2 gas mixture. In conclusion, a gas diffusion biocathode supported bioelectrochemical CO2 reduction with enhanced mass transfer rate at continuous supply of gaseous CO2.

Graphical abstract

Keywords

Microbial electrosynthesis CO2 reduction Gas diffusion electrode Biocathode Autotrophic bioproduction 

Abbreviations

A/m2

Ampere per square meter

Atm

Atmosphere

CEM

Cation exchange membrane

CL

Catalyst layer

DO

Dissolved oxygen

GDE

Gas diffusion electrode

GDL

Gas diffusion layer

MES

Microbial electrosynthesis

kLa

Gas–liquid mass transfer coefficient

NaBES

Sodium 2-bromoethanesulfonate

PTFE

Polytetrafluoroethylene

PVDF

Polyvinylidene difluoride

rpm

Revolution per minute

SHE

Standard hydrogen electrode

OD

Optical density

VFA

Volatile fatty acid

Notes

Acknowledgments

The work was supported by a PhD grant to Suman Bajracharya from VITO’s strategic research funds. The authors acknowledge Mr. Shishir Kanti Pramanik for conducting the gas transfer experiments and taking samples from the reactor.

Supplementary material

11356_2016_7196_MOESM1_ESM.docx (95 kb)
ESM. 1(DOCX 94 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Separation and Conversion TechnologiesFlemish Institute for Technological Research (VITO)MolBelgium
  2. 2.Sub-department of Environmental TechnologyWageningen UniversityWageningenThe Netherlands

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