Fig. 3: Kinetic isotope effect for CO₂ER toward CO and formate.

The j_CO for Au (a), Ag (b), Sn (c), and In (d) in 0.1 M KH₂PO₄ electrolytes with D₂O and H₂O. The j_HCOO⁻ for Sn (e) and In (f) in 0.1 M KH₂PO₄ electrolytes with D₂O and H₂O. Error bars are means ± standard deviation (n = 3 replicates).