It is an ideal way to produce hydrogen by converting renewable energy into hydrogen energy u-sing hydroelectricity.At conventional electrolysis,membrane occupies a large proportion in the cost of e-lectrolytic device and brings high resistance,and the degradation of membrane is a short board that af-fects the life of electrolytic system.Membrane-less water electrolysis technology can effectively avoid the cost,life and resistance brought by membrane,which has great research significance.A two-dimensional numerical simulation model of membrane-less electrolysis with flow-through electrode was developed in this study firstly,taking the mass transport,momentum transport,electrochemical reaction,charge trans-port and their coupling relationship into comprehensive consideration.The ratio of overpotential in the to-tal voltage caused by electrode activation,active area covered by bubbles and ohmic impedance was ana-lyzed,and the influence of electrolyte flow rate and electrode gap thickness on the voltage drop of the whole system was emphatically studied.The results show that the active area covered by bubbles and the overpotential caused by ohmic impedance play a major role in the total voltage,both of which can be re-duced by increasing electrolyte flow rate and decreasing electrode gap thickness.In order to ensure the e-lectrolytic efficiency of the system and reduce the gas content in the gap,it is necessary to coordinate the electrolyte flow rate,current density and electrode gap thickness,so as to achieve the optimal perform-ance.
alkaline water electrolysismembrane-lessnumerical simulationoptimization design
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