Fig. 4: Kinetic isotope effect for HER.

The j_H2 for Au (a), Ag (b), Sn (c) and In (d). The data were obtained from running CO₂ER experiments at 0.1 M KH₂PO₄ electrolyte with D₂O and H₂O. Error bars are means ± standard deviation (n = 3 replicates).