[bmcusick]

Here's the bigger issue than efficiency, IMO:

> during the first 6 hour cycle where the photoelectrode generated 0.18 μmol/cm2 of hydrogen

And then...

>After a further 6 hours illumination, the LaFeO3 thin film generated 0.08 μmol/cm2 of hydrogen (Figure S8). This provided additional evidence that the film is re-useable, although the amount of hydrogen produced is almost halved

From 18 to 8 units/area in just six hours is not a good decay curve.

[bufferoverflow]

It really depends on how cheap that electrode is. If it's a few pennies, nothing stops you from automatically swapping it every couple of hours.