The Hydrogen alternative?

摘要

Hydrogen fuel-cell electric vehicles are being touted as an alternative to plug-in electric vehicles, getting much attention in the media. But there are some important elements of this technology's use that must be noted. First, because there is no "free" hydrogen on Earth, we must put in just as much energy to liberate it from water (and nearly as much to get it from petroleum) as we will later get back in use either to power a fuel cell (that generates electricity to move the vehicle) or for use in some form ofrncombustion. This makes the first scenario only 50 percent efficient, and the latter only 25-35 percent efficient.