Generators don't create energy either... They transform it, like chemical energy into eletric/cinetic/'whateveric' energy. Nuclear energy don't creaty energy either... it simply releases the nuclei energy.

Now if you want to get closer to 'create' energy, you can try a matter/anti-matter mix, but in the end it's another transformation... It's turnning matter into energy.

You can't make energy out of nowhere.

That's why it's referred to as a battery, not a generator. It is a storage medium for energy and it can 'supply' power to a device. There is no implication that this violates the law of the conservation of energy

Re: The last pragraph of the article - energy can be neither created nor destroyed, unles you're talking about atomic power (and some debate that...).

I'd say never. Like the Peltier effect, depends on having a "cold" side. Also, current version is a Rube Goldberg one-shot affair: dab a little fuel on end of nanotube and ignite it with a laser. I'd assume that destroys the nanotube.