Enhancing microbial electrosynthesis of acetate and butyrate from CO2 reduction involving engineered Clostridium ljungdahlii with nickel phosphide modified electrode
2020
Microbial
electrosynthesis (MES) is an emerging technology through
which autotrophic microorganisms can directly uptake electrons or
indirectly uptake electrons through H2 in the cathode for
reducing CO2 to chemicals. In this study, the performance
of MES with engineered Clostridium ljungdahlii was improved by electrochemically depositing a nickel phosphide
(Ni–P) catalyst on the cathode. The acetate production rate
of MES with 15 cycles was 0.17 g L–1 day–1, which was 1.7 times higher than that of MES without the catalyst.
The corresponding butyrate production rate was remarkably enhanced
at 0.1 g L–1 day–1, which was
2.5 times higher than that of MES without the catalyst. Electrochemical
studies, scanning electron microscopy, and confocal scanning laser
microscopy showed that Ni–P could accelerate the release of
hydrogen and promote biofilm formation. These results also implied
that more H2 evolution could provide more reducing power
for butyrate production in the presence of Ni–P. This study
attempted to provide effective strategies for the accumulation of
C4 products in MES.
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