The system is indicated in the article as being competitive with current systems by eliminating the necessity of distributing electrical energy from a central source which makes it expensive. If you go back to the central source you lose the competitive edge.

How so? Centralizing in one location has always been the competitive advantage because of the reduced cost of a single location. Besides the intial start-up cost, you are still talking about an electric power plant that only has to pay for the employees who maintain and run the operation and replacement cost of equipment. This is unlike any other plant that has to pay for not only the employees but also fuel to keep power production running. Were is the business disadvantage?

I don't exactly have a pile of un-used AL-Ga in my back yard. I think the possibilty of carrying around a 'tank' full of metal to produce hydrogen with is kinda funny.

Good luck to them. I don't see anything about the availability of Aluminum-Gallium alloy and if it's eventually used-up, as many catalysts are.

As for goofybrain's post, I agree with sand--the only way a car could run on hydrogen is to produce it on-site, as needed like this article suggest. Otherwise, it permiates the fuel-tank and leaks right out into space. That kinda hurts your gas mileage.

Given the finite amount of aluminum in the earth, I don't know how sustainable it is.