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Scanning electron microscopic (SEM) images of cathode surfaces at poised potentials after the experiment was terminated showing the formation of microbial cell aggregates. (A) Platinum on carbon black with arrows indicating a platinum particle (top) and a microbial filament (bottom). (B) Microbial biofilms form bridges across cracks in iron sulfide doped carbon black underneath the surface. (C) Carbon fiber brush with microbial filaments.
