At MBR, we’re transforming the landscape of hydrogen production with our modular, cutting-edge, on-site systems. Imagine a world where clean, efficient energy is produced right where you need it. That’s the reality we’re creating for the energy sector and industrial manufacturing.
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Whether you’re an energy consultant envisioning the next big project, a CTO seeking to revolutionize your company’s energy strategy, or a plant manager looking to optimize operations, our solutions are tailored for you.
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Enapter’s patented Anion Exchange Membrane (AEM) technology uses a polymer electrolyte membrane, similar to the better-known PEM (Proton Exchange Membrane) technology. The AEM cell design features a semipermeable membrane that transports negatively charged OH- ions to split water molecules into hydrogen and oxygen.
Unlike PEM, AEM technology has no constraints that prevent significant cost reductions. PEM electrolysers, operate with protons (H+) naturally creating a highly acidic environment near the electrodes which leads
to a large corrosion potential. Therefore, bipolar plates must be made of corrosion-resistant, but also very expensive, titanium. Additionally, the expensive and rare noble metal iridium is required as a catalyst.
In contrast, AEM works utilizing ions (OH-) which leads to a base, or alkaline environment, where corrosion protection can be handled with greater ease. Titanium is not required; nickel and iron are sufficient. Iridium as a catalyst is eliminated completely. High efficiency, fast responsiveness, and a compact size similar to PEM are maintained.
Enapter’s AEM stack also functions as a compressor. The aqueous electrolyte solution at the anode is circulated but not pressurized. Instead, hydrogen produced at the cathode builds up to 35 barg of pressure. This electrochemical compression is highly efficient as there are no heat losses associated with mechanical compression. The pressure difference across the membrane ensures extremely low quantities of oxygen can be entrained into the hydrogen, resulting in exceptionally high purity without the need for a deoxo system.
Another unique feature of Enapter’s AEM stack is the “dry cathode”, our patented technology. All water required for H₂ production is transported through the AEM membrane. Hence, no liquid needs to circulate on the cathode. This simplifies system design, eliminating pumps, pipework, and gas separators within the H₂ circuit.While being an important safety aspect – as nitrogen purging can be avoided because of the minimal volumes of the enclosed gas – it also reduces the cost of our AEM electrolysers.
Even though AEM has much in common with PEM technology, AEM is also similar to alkaline electrolysers. An alkaline solution is used as electrolyte to facilitates the electrochemical process. However, this water-based solution has a concentration of only 1% potassium hydroxide (KOH), making it much easier to handle and dispose of than the very caustic 30-40% concentration usually needed in traditional alkaline electrolysers.
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