Water they suggest? Well, yes, but it takes more energy to break apart the molecule than is given off when combined. Last I heard, it was on the order of 8-1, and maybe it's down 2-1, but unless there's an actual need for it, like in outer space, spending two or more to get one back ain't worth it, including all the capital outlay and maintenance costs.
It absolutely is. It is the reason 95% of the hydrogen used today in industrial processes is steam-reformed from methane.