But how is that wrong?To ME.
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Water electrolysis endothermic effect is actually a hypothesis. I am trying now to convince Tarsier79 (by using a step-by-step convincing procedure), that this hypothesis is wrong, but Tarsier79 is ignorant and stubborn.
You need to add energy to split the hydrogen from the oxygen: that's what Endothermic means.
Why is it endothermic, because the water molecule is in a lower energy state.
It likes to be in that state more than in the separate 2O₂ and H₂ state.
And that's why it's so much easier to oxidize the separated hydrogen again with a bang and heat: Exothermic.
How that energy is added for the split does not really matter, but you need you input voltage of at least 1.23 volt and some amperage.
But you could also add energy thermochemically or by laser or radiation.
So please explain how this view is wrong.