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A comment on Researchers have developed a water-based battery to store solar and wind energy. Parent comment
Mn₂⁺ + 2H₂O ⇌ MnO₂ + 2H⁺ + H₂
(Shameless plug: I generated the above with https://github.com/jwilk/chemiscripts .)
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Mn₂⁺ + 2H₂O ⇌ MnO₂ + 2H⁺ + H₂
(Shameless plug: I generated the above with https://github.com/jwilk/chemiscripts .)