They take platinum, and we don't have enough. Sure there are a lot of platinum-free alternative's on the horizon, but they have been saying the same thing for d

They take platinum, and we don't have enough. Sure there are a lot of platinum-free alternative's on the horizon, but they have been saying the same thing for decades. Until the day that we figure out how to make a catalyst out of nanotubes, I'm afraid fuel cells will never compete with batteries on a large scale. They are useful in come niche situations though, see https://en.wikipedia.org/wiki/AeroVironment_Helios_Prototype https://en.wikipedia.org/wiki/AeroVironment_Helios_Prototype