Overcoming Hydrogen Losses in Fuel Cells: A Membrane-based Approach to Sustainable Energy.

Hydrogen (H2) is increasingly recognized as a key candidate to replace fossil fuels due to its high energy density, zero-carbon combustion, and compatibility with fuel cell technologies. Fuel cells offer an efficient means to convert hydrogen into electricity, with only water as a byproduct, making them a cornerstone for the energy transition. However, challenges remain in the widespread adoption of hydrogen, including production methods (green, blue, and grey hydrogen), transportation, and associated losses during fuel cell operation. A critical issue is hydrogen purge losses, where unreacted H2 is vented to maintain fuel cell efficiency and durability. This article explores the fundamentals of H2 fuel cells, purge losses, and the environmental implications. Potential solutions are examined, such as catalytic burning and recirculation systems, to minimize the hydrogen losses in fuel cell strategies. An innovative hydrogen recovery membrane, the SEPARATIC-H2, developed at the University of Fribourg, has been showcased to enhance fuel cell efficiency while reducing H2 waste. By addressing these challenges, hydrogen can reach its potential, accelerating the transition toward a sustainable, low-carbon future.