A solar panel can split water into hydrogen at a rate of 250 liters of hydrogen per day.
Sounds impressive, yes? Well, let's take a look at what that really means. According to the gas laws, 22.4 liters equals 1 mole at standard temperature and pressure. Therefore, 250/22.4 moles of hydrogen gas. Running the arithmetic out at 2 grams per mole equals 22 grams of hydrogen. A kilogram has about the energy of 1 gallon of gasoline, or so I have heard. How much more to reach that energy level? 1000 gram/ 22 grams equals nearly 45 days to make the energy equivalent to a gallon of gasoline.
Doesn't sound that impressive. Indeed, no matter how efficient you make solar cells, you won't improve this by all that much.
Not very impressive. But I am sure the greenies will love the idea. Anything stupid and impractical is right up their alley.
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