From the article and the details they're giving, it doesn't sound very good way to produce fuel. First the sunlight has very low efficiency. And if you're splitting water, you won't get any more energy out than what you could utilize from the sun's energy. And everyone who has spent any time outside during summer knows that the amount of energy that hits the earth can warm it slightly, but it hardly has enough energy to move your car. This means that we'd need to cover very large amount of earth's surface with these panels until you can drive significant number of cars with this fuel.
The reason why oil can move your car is because it took a million years for plants to store energy which was then converted to oil. It's not very good if you need to wait million years before you can drive half a mile with your car. With this tech that splits water, you'd actually keep the panels working for thousands of years before you can get enough fuel....
Once we run out of oil, we will have big problems. Hopefully by that time, they can get cold fusion to work reliably and make it run our cars.