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The equilibrium potential of the water splitting reaction as commonly cited (1.223 V) is at room temperature.
But this potential lowers (i.e., water splitting becomes easier) when the temperature increases (say from 25℃ to 70℃), which has real-world implications for PEC devices under illumination since the electrolyte can be expected to heat up.

In any case, it would be nice if we could include this dimension of temperature in this dataset.