The article discusses the application of Tafel slope plots to analyze electrocatalytic reactions, particularly focusing on separating kinetic and nonkinetic contributions to the Tafel slope value. The authors compare Tafel slope values obtained from linear sweep voltammetry (LSV), chronoamperometry (CA), and impedance spectroscopy (EIS) for various reactions, including the oxygen evolution reaction (OER) on NiFeOOH in 0.2 M KOH, the alkaline hydrogen evolution reaction (HER), and the CO2 reduction reaction (CO2RR). They find that under high-mass-transport conditions, similar Tafel slope values are obtained from different techniques for the OER on NiFeOOH. However, no horizontal Tafel slope regions were observed for the alkaline HER and CO2RR. In contrast, the acidic HER on Pt in 1 M HClO4 showed a clear horizontal Tafel slope region with a value of 30 mV/dec, indicating kinetic meaningfulness. The authors argue that the Tafel slope plot can provide valuable insights into the kinetic meaningfulness of Tafel slope values and should be widely applied to improve the comparison of kinetic data for electrocatalytic reactions. They also discuss the limitations and complications in Tafel slope analysis, such as mass transport limitations, bubble formation, and potential-dependent effects, and suggest that more complex models are needed for intrinsically nonlinear Tafel slope plots.The article discusses the application of Tafel slope plots to analyze electrocatalytic reactions, particularly focusing on separating kinetic and nonkinetic contributions to the Tafel slope value. The authors compare Tafel slope values obtained from linear sweep voltammetry (LSV), chronoamperometry (CA), and impedance spectroscopy (EIS) for various reactions, including the oxygen evolution reaction (OER) on NiFeOOH in 0.2 M KOH, the alkaline hydrogen evolution reaction (HER), and the CO2 reduction reaction (CO2RR). They find that under high-mass-transport conditions, similar Tafel slope values are obtained from different techniques for the OER on NiFeOOH. However, no horizontal Tafel slope regions were observed for the alkaline HER and CO2RR. In contrast, the acidic HER on Pt in 1 M HClO4 showed a clear horizontal Tafel slope region with a value of 30 mV/dec, indicating kinetic meaningfulness. The authors argue that the Tafel slope plot can provide valuable insights into the kinetic meaningfulness of Tafel slope values and should be widely applied to improve the comparison of kinetic data for electrocatalytic reactions. They also discuss the limitations and complications in Tafel slope analysis, such as mass transport limitations, bubble formation, and potential-dependent effects, and suggest that more complex models are needed for intrinsically nonlinear Tafel slope plots.