Why Zinc if Carbon is sufficient?
From "Eco-friendly artificial muscle fibers can produce and store energy" https://news.ycombinator.com/item?id=42942421 :
> "Giant nanomechanical energy storage capacity in twisted single-walled carbon nanotube ropes" (2024) https://www.nature.com/articles/s41565-024-01645-x :
>> 583 Wh/kg
That's with mechanical twisting though; graphene supercapacitors in general have lower energy density than (micro-) capacitors?