Modeling 3D current and potential distribution in a microbial electrolysis cell with augmented anode surface and non-ideal flow pattern

Four stages of thermal effect coupled with ion‐charge transports during the charging process of porous electrodes

“…Electronic connections through the electrode (drawn as black lines) allow for the injection of charge from an external circuit. 21 Figure 2C is an ideal cell model 43 constructed by an array of square electrodes (i.e., carbon particle in Figure 2B) with side length w. To make the next simplification process easier to understand, the gaps along y direction are named by permeable zones and colored by gray, as shown in Figure 2D. Because the porous electrode is infinitely large along y direction and all ions are ideal point charge, we F I G U R E 2 (A) Planar electrode and the simplification process from (B) amorphous carbon electrode with uniform pore size to (C) ideal cell model to (D) ideal cell model with permeable zones to (E) stacked planar electrodes with thickness to (F) stacked planar electrodes without thickness assume that the square electrodes along y direction are macroscopically connected to form a planar electrode of thickness w but microscopically separated by permeable zones, as shown in Figure 2E.…”

Design of 3D microbial anodes for microbial electrolysis cells (MEC) fuelled by domestic wastewater. Part I: Multiphysics modelling

“…Similar calculations have been performed, validated with experimental data, which provided better understanding regarding the influence of temperature (20-40 • C) on the performance of microbial fuel cell [15]. Hernández-García et al [16], modelling a reactor with a cylindrical cathode around a packed bed of 95 carbon felt blocks, have demonstrated that anodic reaction rate is higher in the outer edges of the carbon bed compared to the center, and that "dead zones" are present in the reactor (low flow velocity) due to the dimensions and positioning of the inlet and outlet. Reyes-Vidal et al [17] have studied numerically the impact of the implementation of fluid distributors at the inlet and outlet on the performance of a bioelectrochemical reactor applied for wastewater treatment.…”

“…This software is widely adopted to model electrochemical systems at macroscopic scale such as polymer electrolyte membrane electrolyser [28,29], solid oxide fuel cells [30,31] or batteries [32][33][34]. The approach considered in the present study has already been implemented for modelling MEC [35][36][37][38]. Triangular meshes are chosen for all geometries considered here.…”

The mode of operation over time affects the capacitive properties of a packed anode biocapacitor

“…This kind of support includes bunched fibers, packed particles, and porous monolithic electrodes, which are specifically used in relatively high-volume BESs. For instance, Zhao et al (2020) used a carbon brush in a 0.5-L BES, Hernández-García et al (2020) and Isaacs-Páez and Cercado (2020) reported a carbon felt packed anode in a 1-L reactor, and Borsje et al (2019) described the use of granular activated carbon in a 7.7-L reactor.…”