1 research outputs found
Electrochemical Behavior of Anode-Respiring Bacteria on Doped Carbon Electrodes
Cultivating
anodic respiring bacteria (ARB) on anodes doped with
metal-enhanced biological growth and affected higher electocatalytic
activity (ECA). The anode doped with calcium sulfide (CaS) proved
more favorable for ARB than the magnetite (Fe<sub>3</sub>O<sub>4</sub>) or ironÂ(II) sulfide (FeS). Average anodic current densities of
8.4 Am<sup>2–</sup> (Fe<sub>3</sub>O<sub>4</sub>), 11.1 Am<sup>2–</sup> (FeS), and 22.0 Am<sup>2–</sup> (CaS) were
achieved as compared to that of nondoped carbon (5.1 A m<sup>–2</sup>). Thus, CaS-doped graphite represents a promising anode material
which is suitable for highly efficient bioelectrochemical systems
(BES). Electrochemical evaluation during turnover and starvation using
simple cycle voltammetry (CV) and derivative cycle voltammetry (DCV)
indicated several extracellular electron transfer (EET) pathways characterized
with lower potentials for biofilms. However, despite the high affinity
of bacteria to iron, their lower ECA was kinetically attributed to
the accumulation of self-produced mediators on iron-doped anodes