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(a) Illustration of alkaline HER consisting of adsorption (Volmer) and desorption (Tafel or Heyrovsky) steps and (b) volcano-shaped curve of the activity of typical HER electrocatalyst in alkaline media, in which exchange current densities (log(i0)) on monometallic surfaces are plotted as a function of the calculated hydrogen binding energy. Panel b is reproduced with permission from ref (18). Copyright 2013 Royal Society of Chemistry.
