Characterization of bubble formation in microfluidic fuel cells employing hydrogen peroxide

▶ Cells operated at higher volumetric flow rates showed more frequent coalescence of the O2 bubble. ▶ Cells operated at higher volumetric flow rates showed slightly higher bubble growth rates. ▶ The ratio of average measured bubble growth rate to average current density was approximately a constant. ▶ Cells operated at either a higher flow rate or with a smaller microchannel width showed more violent bubble evolution.