PEM cells – gamechanger for a large-scale and low-cost green energy production

As the world accelerates its transition towards renewable energy, new technologies play a critical role in meeting the growing demand for sustainable and efficient energy sources. One of the most promising technologies in this area is Proton Exchange Membrane (PEM) fuel cells. These advanced cells are at the heart of a potential revolution in green energy production, promising to reduce carbon footprints and help industries transition to clean energy on a large scale. But what are PEM cells, and how can they contribute to large-scale green energy production?

What are PEM fuel cells?

PEM fuel cells are a type of electrochemical cell that generates electricity through a simple chemical process: the reaction between hydrogen and oxygen. In the heart of the cell lies a membrane known as the Proton Exchange Membrane (PEM), which plays a critical role in allowing protons to pass through while blocking electrons, forcing them to flow through an external circuit to generate electricity.

When hydrogen enters the fuel cell, it splits into protons and electrons. The protons pass through the PEM membrane, while the electrons are forced into an external circuit, creating a flow of electricity. The protons and electrons then recombine with oxygen on the other side of the membrane, producing water as the only byproduct. This makes PEM fuel cells a zero-emissions technology—ideal for clean energy systems.

The role of PEM cells in green energy production

PEM fuel cells are efficient, scalable, and, most importantly, produce no harmful emissions. Unlike traditional fossil fuels that release CO₂ and other pollutants, PEM fuel cells emit only water and heat. This zero-emissions nature is a crucial factor in achieving global climate goals and reducing air pollution in urban areas. Moreover, hydrogen, the most abundant element in the universe, can be sourced through various means, including renewable energy-powered electrolysis. PEM fuel cells are efficient in converting this hydrogen into electricity, with conversion efficiencies ranging from 40-60%, far surpassing the efficiency of conventional combustion engines. And last but not least, one of the most exciting possibilities for PEM fuel cells is their role in storing and distributing renewable energy. As the world moves towards solar, wind, and other intermittent renewable sources, PEM cells can act as energy storage systems. Surplus energy from renewables can be used to produce hydrogen through electrolysis, which can then be stored and used to generate electricity later, ensuring a steady, reliable energy supply.

PEM fuel cells have long been used in smaller applications like vehicles, backup power systems, and portable electronics. However, recent advancements in materials, system designs, and hydrogen infrastructure are making it feasible to scale PEM technology to much larger projects. For PEM fuel cells to truly become the backbone of green energy, large-scale hydrogen production needs to expand. Green hydrogen, produced through electrolysis powered by renewable energy, is key. 

Obstacles to mass implementation

Despite the promise of PEM fuel cells, challenges remain. One of the most significant hurdles is the cost of production, particularly in creating affordable, green hydrogen. The answer to the above-mentioned problem is the research of Dr. Biswaranjan Das Mohapatra conducted as part of the POLONEZ BIS program, focused on designing Iron (Fe) or Nickel (Ni) containing Tantalum oxide (TaOx) and Hafnium oxide (HfOx) nanomaterials for efficient and stable oxygen electrocatalysis applications. Attempts at designing nanostructured thin oxide films are a fascinating area of material science due to their unique properties, and undoubtedly Dr Das Mohapatra’s recent research outcome makes them useful for a wide range of applications, including sensors, catalysts, energy storage, and electronics. The  research carried out revealed that their structure at the nanoscale endows them with remarkable physical and chemical characteristics, including a high surface area-to-volume ratio, anisotropic behavior, and tunable surface charge. The project results are intended to lead to a reduction in the production costs of PEM cells and thus bring us closer to the production of green energy on a larger scale. Moreover, thanks to lower production costs, they will be able to be successfully implemented in various industries.