수전해에서 물질 전달과 수소 기포 생성에 대한 수치적 연구

초록

In alkaline water electrolysis(AWE), hydrogen bubbles are generated through electrochemicalreactions involving the interaction between continuous and dispersed phases. In this work, a multiphase numerical model for AWE is developed to simulate the evolution of hydrogen bubble associated with the transport of dissolved hydrogen in liquid water. The numerical results show that bubble nucleation under supersaturation conditions of dissolved hydrogen gas is a critical parameter in determining gas evolution in AWE. The effects of ambient temperature and current density on bubble evolution are investigated. As current density increases and bubble resistance rises, the ohmic overpotential is observed to dominate over the activation overpotential.

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