Abstract
Gas crossover is an important feature affecting the overall performance of membrane-free water electrolyser, as it may lead to compromised product quality and safety risks. In this paper, the concept of using flow control device for reduction of gas crossover in a membrane-free water electrolysers is introduced. A numerical study is conducted to investigate the influence of flow controller on the H2 bubble curtain thickness in a vertical flow-by membrane-free electrolyser under various operating conditions, and the effect of flow controller geometry on the H2 bubbles is systematically studied. An experimental rig is developed to validate the numerical model and to test the performance of a flow controller prototype. The results show that the proposed flow controller can effectively alleviate the crossover of gases in the electrolyser cell without compromising the cell efficiency.
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