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Mo2C-induced hydrogen production enhances microbial electrosynthesis of acetate from CO2 reduction.


ABSTRACT:

Background

Microbial electrosynthesis (MES) is a biocathode-driven process, in which electroautotrophic microorganisms can directly uptake electrons or indirectly via H2 from the cathode as energy sources and CO2 as only carbon source to produce chemicals.

Results

This study demonstrates that a hydrogen evolution reaction (HER) catalyst can enhance MES performance. An active HER electrocatalyst molybdenum carbide (Mo2C)-modified electrode was constructed for MES. The volumetric acetate production rate of MES with 12 mg cm-2 Mo2C was 0.19?±?0.02 g L-1 day-1, which was 2.1 times higher than that of the control. The final acetate concentration reached 5.72?±?0.6 g L-1 within 30 days, and coulombic efficiencies of 64?±?0.7% were yielded. Furthermore, electrochemical study, scanning electron microscopy, and microbial community analyses suggested that Mo2C can accelerate the release of hydrogen, promote the formation of biofilms and regulate the mixed microbial flora.

Conclusion

Coupling a HER catalyst to a cathode of MES system is a promising strategy for improving MES efficiency.

SUBMITTER: Tian S 

PROVIDER: S-EPMC6442412 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Publications

Mo<sub>2</sub>C-induced hydrogen production enhances microbial electrosynthesis of acetate from CO<sub>2</sub> reduction.

Tian Shihao S   Wang Haoqi H   Dong Zhiwei Z   Yang Yang Y   Yuan Hao H   Huang Qiong Q   Song Tian-Shun TS   Xie Jingjing J  

Biotechnology for biofuels 20190401


<h4>Background</h4>Microbial electrosynthesis (MES) is a biocathode-driven process, in which electroautotrophic microorganisms can directly uptake electrons or indirectly via H<sub>2</sub> from the cathode as energy sources and CO<sub>2</sub> as only carbon source to produce chemicals.<h4>Results</h4>This study demonstrates that a hydrogen evolution reaction (HER) catalyst can enhance MES performance. An active HER electrocatalyst molybdenum carbide (Mo<sub>2</sub>C)-modified electrode was const  ...[more]

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