8 hours...
"In their experiments, the researchers found that electrodes without titanium dioxide corroded and failed within a half hour, while the titanium dioxide-coated ones lasted eight hours without corroding or losing efficiency."
Does this mean you have to replace the dioxide every 8-hours? If so this is a small step in the right direction, but a long ways form economically viable.
There is an old saying..."Hydrogen is the fuel of the future....and always will be"