This paper by Moth-Poulson describes a compound matching the Bloomberg article - one with only C, O, H atoms. It's an organic molecule with two benzene rings that shifts a bond angle to store solar energy with 1% efficiency. In the paper they're testing it in a solution of toluene. If you're trying to store solar energy in an environmentally friendly way, I'm not sure that benzene compounds dissolved in paint thinner are a good way to go.

Mary had a little lamb
Its brain was like a child
And to research its lysosomes
She had its genes restyled

Oh, the irony.

What's the best way to stop cookies? Use private browsing (incognito) mode.

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