Float and tether energy collectors (any combination of solar/ wind/ wave collectors) onto offshore (and potentially out of sight) platforms: use the energy to generate hydrogen by electrolysis from sea water. The hydrogen gets stored in tanks on the platforms and harvesting would entail swapping empty tanks with charged tanks.
In today’s climate of peak water, there is an additional positive effect of this model: the fresh water by product of hydrogen combustion as fuel. In effect, hydrogen by electrolysis from sea water is a form of desalinization.
Your concept of hydrolysis of sea water, with later burning of the hydrogen to yield fresh water, as a form of desalination seems a great addendum to offshore-wind-split water's hydrogen as a pipe-able fuel for utilities.
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