Cheap proton batteries compete with lithium on energy density

https://newatlas.com/energy/rmit-proton-battery-energy-density/

"specific energy density 245 Wh/kg... stores hydrogen protons in holes solid porous activated carbon electrode soaked in dilute acid. Discharging battery adding oxygen... vacuum drying activated carbon prior to electrode preparation, 70°C... replacement oxygen-side gas diffusion layer with thinner GDL fiber sheet... storing 3X energy/ wt., 2X highest electrochemical hydrogen storage, density 882 J/g, safe stable transport hydrogen, fast charging, carbon abundant, recyclable... >75% roundtrip energy efficiency ... scalable"

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