From the mobilescout.com article:

(Oh boy)

So, the fuel cell sends water to the fuel chamber, which makes hydrogen from the water that it sends back to the fuel cell to combine with oxygen to make power. Luckily, that water can then be recycled back into the fuel chamber to . . . well . . . perpetuate the process, and, um, keep everything in motion.

Let me just drag this out again (and of course -- as always -- with my apologies to Cory Doctorow)

This article proposes a

( ) mechanical (X) thermal ( ) gravitational ( ) voodoo

approach to create infinite/cheap energy. Your idea will not work. Here is why it won't work. (One or more of the following may apply to your particular idea, and it may have other flaws.

( ) You made a math error
(X) You have made a faulty assumption
(X) You don't understand physics
( ) You keep saying "greater than unity"

Specifically, your plan fails to account for

( ) Mechanical Friction
( ) Physical constants
( ) Laws of motion
(X) Laws of thermodynamics
( ) Asshats
( ) Gravity
( ) Turbulence
( ) Division by zero yielding undefined result
( ) Unit conversions
( ) Unavailability of infinately strong materials
( ) Unavailability of a perfect vacuum
( ) Solar heating
( ) Stuff that's lighter than air still having mass
( ) Translation losses

and the following philosophical objections may also apply:

(X) Ideas similar to yours are easy to come up with, yet none have ever
been shown practical
(X) Smarter people than you have tried to do this before

Furthermore, this is what I think about you:

(X) Sorry dude, but I don't think it would work.
( ) This is a stupid idea, and you're a stupid person for suggesting it.
( ) Nice try, assh0le! I'm going to find out where you live and burn your
house down!