Fig. 3From: Hydrogen production from water electrolysis: role of catalysts(Figure reprinted with permission from Ref. [34])Volcano plots: a exchange current density vs. the M–H bond energy for each metal surface (for acidic media) (Figure reprinted with permission from Refs. [32, 33]); b exchange current density on monometallic surfaces vs. the calculated HBE (for alkaline media)Back to article page