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In an alkaline electrolyzer, two electrodes are submerged in a solution of alkaline water (usually consisting of a high concentration of potassium or sodium hydroxide). Alkaline electrolysis differs from the other main approach, proton-exchange membrane electrolysis, in a few ways. One of the most important, though, is that alkaline electrolysis doesn’t require expensive exotic metals like platinum. That gives alkaline electrolyzers a cost advantage from the start, one that Evoloh says it builds on with its lower-cost manufacturing. To further trim manufacturing costs, Evoloh uses roll-to-roll printing, a technique pioneered centuries ago by printing presses and more recently used in battery manufacturing.