MIT scientists propose power storage using cement blocks
VulcanSphere@kbin.social to 
datacenterdynamics.com
Plan to commercialize supercapacitors in the next few years
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VulcanSphere@kbin.social to VulcanSphere@kbin.social to
One catch is that carbon black is mostly made from fossil oil.
It's more nuanced than that. The question is whether we're just using carbon black that's already an excess byproduct of other industries, or we'd be actively producing it to make these wall batteries.