• Huang, J.; Zhu, X.; Eikerling, M. The Rate-Determining Term of Electrocatalytic Reactions with First-Order Kinetics. Electrochim. Acta 2021, 393, 139019. Analytical expressions of the activity of multi-step reactions with first-order kinetics were derived under steady-state conditions. Expressions for inverse rates allow the rate-determining term (RDT) to be identified, a concept that is insightful in analyzing Tafel slopes and volcano plots.