Polyurethene liners in type IV hydrogen tank for hydrogen energy Mohammad Mizanur Rahman King Fahd University of Petroleum and Minerals, Saudi Arabia Hydrogen energy is being considered the future energy of the world. Hydrogen can be stored as a solid, liquid and gas state. A high pressure is required for gas stage hydrogen storage. Currently, there are different types of hydrogen storage tanks, such as, type I, type II, type III, and type IV being considered for high pressure gas state hydrogen storage. The cost, safety, longevity and performance ultimately determine the tanks. Among all the tanks, the type IV tank is being attracted hugely due to its lightweight, cost-effective, as well as low storage energy consumption. The major challenge of typeIVis unwanted hydrogen permeability through the polymer liner. Polymer nature significantly affects hydrogen diffusion and permeability. Different formulated polyurethane and polyurethane nanocomposite liners used in this study to evaluate the PU composition on hydrogen diffusion as well as the chemical structure changed under pristine hydrogen, methane gas and different blended mixtures at different temperature and pressure. The experiment was continued for a defined time frame up to 30 days. There have been different findings of hydrogen diffusion and permeation. The polyurethane nanocomposite showed a much lower rate of hydrogen diffusion. The polymer interaction with hydrogen associated with possible damage modes of hydrogen embrittlement and delamination was also evaluated in this study. The results will surely help to choose a proper polymer liner for many applicationsfor type IV hydrogen tanks.
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