Fig. 3 | Nature Communications

Fig. 3

From: Direct oxygen isotope effect identifies the rate-determining step of electrocatalytic OER at an oxidic surface

Fig. 3

Schematic explanation for the decrease of selectivity upon increase in overpotential in electrochemical reactions. A change in mechanism is not required to explain a decrease in selectivity. The scheme includes the free enthalpy of activation ΔG‡, and the free enthalpy of reaction ΔG°, which depends on the number of electrons n exchanged in the rate-determining step, the Faraday constant F and the overpotential ƞ

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