Fig. 5: Scale-up of the electrolysis and the HER performances of the large electrode operated at high current densities and high operating temperatures.

a Digital image of the large MoC–Mo2C-790 electrode. b Contact angle image between water and the large MoC–Mo2C electrodes, and photos showing the H2 bubble evolution process on the electrode. c Stability test at simulated industrial operating conditions in both 0.5 M H2SO4 and 1 M KOH at 500 mA cm−2 and 70 oC. LSV curves before and after stability tests at simulated industrial operating conditions (d, e). f LSV curves of the MoC-Mo2C-790 electrode in both acidic and alkaline solutions at 25 oC and 70 oC.