Could you soon be filling up with SEAWATER? US Navy reveals 'game changing' fuel created from water

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20. Here's why.

The second law of thermodynamics.

That's a given. There is always waste in any physical process. That is why hydrogen as a fuel for energy is not an energy source. It can be correctly termed as an energy storage medium, but not a source.

Why? Because there are zero sources of gaseous hydrogen on Earth. All hydrogen on Earth is chemically bonded to other atoms, like in water.

It always takes more energy to free the hydrogen than is gained by burning it as fuel. That's just the physics. People have to deal with that fact.

For instance, excess solar power can be used for electrolysis of water during the day time. The generated hydrogen can then be used to generate power during the night when solar energy makes no power. Yup! It's inefficient, but the alternative is to throw away the excess power. One has to store the energy in some way. Hydrogen might work out for that.

But again. There are no sources of hydrogen on Earth that don't require breaking chemical bonds. And that will always take more energy than is gained by burning the hydrogen. Always!