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Originally Posted by techwhiz1
Actually not so fast.
You actually need the correct electrodes and "clean" water. Therein lies the problem. There are some areas of progress with an acid solution with sea water for direct hydrogen generation.
But the largest issue is you need clean water and lots of electricity. Hydrogen generation is extremely endothermic. Think about it. If you can generate lots of energy combining hydrogen and oxygen and water is extremely stable, you need to put that much energy in and some to strip the atoms.
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An oversimplification for sure and yes not very efficient however during the solar peak of the day, there is always way more supply than demand, let's say the grid can't take anymore, batteries fully charged etc, all the excess should be put into green hydrogen and efficiency doesn't matter as this energy would be wasted otherwise.