Bidirectional electroactive microbial biofilms and the role of biogenic sulfur in charge storage and release

Abstract

. The anodic cultivation was followed by a potential reversal regime, transitioning the electrode potential from 0.2 V to -0.8 V every 2 h to switch between anodic and cathodic conditions. The charge-discharge behavior was studied, revealing an electrochemical conversion of biogenic elemental sulfur as major charge-discharge mechanism. The microbial sequencing revealed strong differences between North- and Baltic-Sea-derived biofilms; however with a large number of known sulfur-converting and electrochemically active bacteria in both biofilms.

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