It's worth noting that regardless of this development, hydrogen fuel cells still do not work well in sub-zero temperatures unless they are operated in perpetuum

It's worth noting that regardless of this development, hydrogen fuel cells still do not work well in sub-zero temperatures unless they are operated in perpetuum. When you decide to shut down your fuel cell and the temperature of the system drops below zero, water will freeze on your micron-thick platinum catalyst; cracking it, and rendering the entire fuel cell useless.