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residue69 2 points ago +2 / -0

Developed at Washington University, so it's racist.

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pseudosapient 1 point ago +1 / -0

I mean, you can store power in almost anything. The trick is to do it in a space-efficient, weight-efficient manner with decent longevity and decent round-trip losses.

Unfortunately, these are supercaps, which tend to be great on longevity but terrible on space/weight efficiency, and lose charge over time.

They are getting ~222uWh/cm^2 which works out to ~20Wh in 100 square feet of brick wall. Note: not kWh. Wh. 0.02kWh in 100 square feet of wall.

Now, if they can scale it up - say, by further increasing surface area while not compromising structural integrity - that'd be great.

Nowhere near there yet though.