Clean fuel cells could be cheap enough to replace gas engines in vehicles

[mackdaddy]

4. I would say that a Fuel cell takes energy stored as hydrogen and converts it to electricity.

It still takes some original source energy to create the stored hydrogen. Solar wind Nuke or Fossil fuels are used to Isolate and compress the Hydrogen into the storage device.

The fuel cell is a type of chemical battery device that uses the chemical reaction of hydrogen combining with oxygen to convert this energy to electrical energy. The fuel cell basically keeps running as long as hydrogen and oxygen are supplied to it.

A storage or rechargeable battery has an form of original source electrical energy charge applied to it which causes an internal chemical reaction to happen storing most of that energy. When electrical energy is taken out of the batter, the electro-chemical reaction is reversed "liberating" the electrical energy to be used.

So both the Hydrogen generation/use cycle system and the battery take some source energy and store it for later use.