ByAlan Ohnsman,
Forbes Staff.
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heap green hydrogen seems like an ideal clean fuel, but thus far isn’t being produced at high volume and low cost. That’s because of the need to use iridium, a remarkably pricey and scarce element, in Proton Exchange Membrane (PEM) electrolyzers, devices that make hydrogen by using electricity–ideally from renewable sources–to split water molecules, releasing only oxygen as a byproduct.
