Effect of Gas Bubble Evolution on the Energy Efficiency in Water Electrolysis

摘要

During alkaline water electrolysis, due to the presence of hydrogen and oxygen bubbles in the electrolyte, additional electrical energy losses occur. For obtaining insight into the effect of the presence of these gas bubbles on the energy efficiency of the water electrolysis, both the gas bubble behavior and the ohmic potential drop across the bubble-containing electrolyte have been investigated. As to the gas bubble behavior, various regions occurring at various volumetric gas production rates are distinguished.