| 초록 |
In fuel cell and electrolysis systems, hydrogen crossover is a phenomenon where hydrogen molecules (H2) permeate through a membrane from cathode to anode, lowering the overall process efficiency and generating a potential safety risk. In the previous study, we developed a Presure Decay Method (PDM), a method to measure the rate of hydrogen crossover for wetted membrane by increasing the accuracy. In this work, we measured the hydrogen crossover of fluorine-based Nafion series and hydrocarbon-based BPSH series using GC and PDM methods to demonstrate that PDM is highly favorable. In addition, the hydrogen transfer mechanism through the wetted membrane was explained by water uptake and effective diffusivity of the polymer with water. By applying effective diffusivity to a simple permeation model, the wetted membrane permeability, which had a large error, was accurately predicted, clearly showing the need to understand the hydrogen permeation mechanism through the wetted membrane. |
