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A comment on Photocatalyst splits water into H and O2 at quantum efficiency near 100%. Parent comment

Re:Photocatalyst splits water into H and O2 at quantum effic... by yholio on Sunday December 27, 2020 @10:54PM (#25556530)
That's not really accurate since the "electrolyte" changes phase requiring external storage (H2O -> gaseous H2) and the re-oxygenation step cannot be performed (yet) in the same device as the electrolysis.

It's not an electrochemical battery but I can agree with seeing it in a general sense as the an energy storage device, in the same way a dam is a "gravitational battery".

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Re:Photocatalyst splits water into H and O2 at quantum effic... by Hypx on Monday December 28, 2020 @01:25AM (#25557199)
You can perform both steps in the same device. It's just more efficiency to have a dedicated electrolyzer doing that elsewhere.
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