Indeed. What most people don’t realize is that the reaction to produce hydrogen gas requires more energy than it produces. However, if we can use something cheap and photoactivated (like MoSO4 as they did here), then great!

Although, you have to think about it. We’re using corn to make Ethanol. Now we’re going to use water to make Hydrogen? At some point, the world’s resources are not going to be able to sustain both and someone is going to suffer because of it.