Using sunlight is not anything new in electrolysis, but the volume of hydrogen produced is never mentioned.
However, bypassing using more energy to split water than what you get back by using the sun is a great step.
Someday soon all the advancements is fuelcell tech will combine into one very usable cell.
I agree, we need to see some numbers from this process to see if it is just a research curiosity or a promising technology. If it pans out, it could be an excellent way to provide H2 and O2 for a fuel cell. It all depends on cost and reliability.
Nice idea though.