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The availability of sustainable and environmentally friendly energy sources is one of the biggest challenges faced by scientists and engineering communities. First of all, the fossil fuels used to meet existing energy demands cause the depletion of resources, the increase of greenhouse gas emissions, and eventually destruction of nature. Polymers have many industrial application areas due to the ease of processing, the reasonable price and the ability to modify with the desired features. Biopolymers have become a focus of attention in terms of the polymer sector because biomass can be separated into harmless products such as CO2 and H2O in the natural environment and can have sustainable resources. The studies on biomass and hydrogen fuel cells are more advantageous than other alternative and clean energy sources because they have the continuous energy supply, compact design, and wide application areas without being dependent on nature. In practice, the polymer electrolyte membrane fuel cells are pinched among the other fuel cells. For this purpose, in this chapter diffusion, transport and water absorption properties of eco-friendly polymer composites generally used are discussed.