At low flow rate conditions, though the electrolyte is replaced at the electrodes surface, however, the electrolyte replacement rate is not sufficient to totally eliminate the dramatic spatiotemporal pH changes happening at the electrodes surface, leading to a significant increase in the electrolyser's current density. As the electrolyte flow rate is increased, a systematic decrease in the electrolyser's current density is observed, due to increased electrolyte replacement rate. At higher flow rates, the curve of the electrolyser's increase in current density reaches a plateau, because of at these high flow rates an effectively fast electrolyte replacement rate is attained, thus effectively inhibiting the formation of the detrimental acidic and basic space fronts at the electrodes vicinity during the water splitting process. including the oxygen reduction and oxygen evolution reactions .