Oxygen Limitation in Microfluidic Biofuel Cells

Physical Modeling of the Enzymatic Glucose-Fuelled Fuel Cells

“…The use of the modeling approach [7] to interpret the behavior of enzymatic fuel cells is not so common in the literature. The enzymatic fuel cells models include reaction kinetics, transport phenomena [8,9], statistical analyses [10] and metabolic analyses [11]. There is a single channel [8] for flow of each anolyte and catholyte stream.…”

Enzyme-Based Microfluidic Biofuel Cell to Generate Micropower

“…However, the use of dissolved oxygen in enzymatic fuel cells is one of the main limitations of these systems due to low concentration (~ 0.2 mM) and low diffusion coefficient of oxygen (1.97 10 -5 cm 2 s -1 at 20 °C) (Barton, 2005). Usually, an exponential decay in the availability of oxygen at the cathode is observed along the length of microchannel (Bedekar et al, 2008). As a result, the oxygen flux is very low, limiting the generation of current.…”

“…However, due to pressure-driven convective flow, the oxygen is still not consumed. To increase the availability of oxygen at the cathode surface, one strategy consists of designing a branchedmicrochannel configuration with several electrodes that allows periodically full contact of the electrolyte with the electrodes (Bedekar et al, 2008). Another promising approach developed until now and only for fuel cells (methanol or acid formic/O 2 ), is to incorporate cathodes that access the surrounding air with higher diffusivity and O 2 concentration.…”

Theoretical treatment of diffusion and kinetics of osmium redox polymer mediated glucose oxidase enzyme electrodes: Analytical expression of current density for varying potential

“…Mathematical models must incorporate consideration of various processes like electron and species transport, reaction mechanism and experimental techniques etc, which controls the overall performance [9] . Interesting approach for the theoretical modeling of enzymatic approach is discussed by Glykys et al [10]. Paul Kavanagh et al recently analyzed mediated electron transfer processes for glucose oxidizing enzyme electrodes based on anodes in a biofuel cell [8].…”

“…Paul Kavanagh et al recently analyzed mediated electron transfer processes for glucose oxidizing enzyme electrodes based on anodes in a biofuel cell [8]. In the literature contains several modeling of enzymatic electrodes [10][11][12][13] and enzymatic biosensors [14], the modeling of enzymatic electrodes has been more attractive due to the consideration of the enzymatic reaction and the material balance of species which are participating in the enzymatic reaction. Andrieux and Saveant [15] have reported kinetics of electrochemical reactions mediated by redox polymer films for stationary voltammetry techniques.…”