Cyclic voltammetry studies of bioanode microbial fuel fells from batch culture of Geobacter sulfurreducens

Abstract

The present study aims to investigate the performance of batch culture of Geobacter sulfurreducens (G. sulfurreducens) for electrical current generation via cyclic voltammetry (CV) method. The CV study was performed with an applied voltage in the range of -0.1 to 0.1 V against the standard calomel electrode (SCE) during the cell growth and attachment of G. sulfurreducens on graphite felt and initial acetate concentration of 20 mM. The kinetics of electrode reaction was investigated by conducting CV experiments at different scanning rates of 5, 10, 20, 50 and 100 mVs -1. The diffusion coefficients (D) and heterogeneous electron transfer rate constant (k o) of both anodic and cathodic process were 1.04×10 -5 cm 2·s -1, 1.73×10 -6 cm 2.s -1, 0.0004 cm.s -1 and 0.0011 cm.s -1, respectively. The obtained results showed that the anode exhibits high bioeletrocatalytic activity due to the attachment of G. sulfurreducens on the anode surface.

Symmetric Aqueous Batteries of Titanium Hexacyanoferrate in Na+, K+, and Mg2+ Media

“…During the cathodic scan, D Na + values for peaks 4-6 are 1.22 × 10 −7 cm 2 /s, 6.27 × 10 −7 cm 2 /s and 1.71 × 10 −7 cm 2 /s, respectively. The diffusion coefficients for the anodic peaks and cathodic peaks are slightly different, which indicates that the redox process followed a quasi-reversible reaction rather than a totally reversible reaction [34].…”

“…scan, DNa + values for peaks 4-6 are 1.22 × 10 −7 cm 2 /s, 6.27 × 10 −7 cm 2 /s and 1.71 × 10 −7 cm 2 /s, respectively. The diffusion coefficients for the anodic peaks and cathodic peaks are slightly different, which indicates that the redox process followed a quasi-reversible reaction rather than a totally reversible reaction [34]. Secondly, the full battery displayed in Figure 2a was further tested in a positive potential only, within the voltage range of 0~1.5 V. The scheme of the aqueous full cell is shown in Figure 3.…”

Statistical optimization of waste molasses-based exopolysaccharides and self-sustainable bioelectricity production for dual chamber microbial fuel cell by Bacillus piscis

“…When B. piscis was used as the source of the adsorption processes, the adsorbed nutrients also appeared on the anodic electrode surface. These findings demonstrated that the combination of diffusion and adsorption processes limited the kinetics, demonstrating an irreversible electron charge transfer nature of these peaks [ 43 ].

Fig.7 Kinetic study of B. piscis oxidation and reduction peaks at the 5th day of inoculation at the scan rates of 5, 10, 20 mV s. −1 , a CV at different scanning rates, b , c Ip at each redox vs square root of ʋ (Randles–Sevcik equation), d , e Ep vs log ʋ (plain diamonds) and log I vs log ʋ (black triangles).

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Preparation of nickel foam modified by multiwalled hollow spheres of NiCo2O4 as a promising non-enzymatic glucose sensor

“…This result indicates that a quasi-reversible electron transfer reaction occurs. 48 Plots of the square root of the scan rate versus the peak current (I p ) (Fig. 6c), showing a linear t with the R 2 = 0.999, indicate that the electron transfer on the prepared electrode surface is a diffusioncontrolled process.…”