This paper presents a benchmarking study of heterogeneous electrocatalysts for the oxygen evolution reaction (OER). The study includes XPS spectra of various catalysts, including IrOx, CoOx, NiOx, NiCeOx, and others, which provide insights into their surface composition and oxidation states. The authors also discuss the choice of specific capacitance for electrochemical measurements, which is crucial for determining the electrochemically active surface area. The Pt surface area was measured using cyclic voltammetry and double-layer capacitance measurements. The study also includes representative current and potential steps for NiOx, as well as activity and stability measurements for various catalysts, including CoOx, CoFeOx, IrOx, NiCeOx, and others. The results show that NiCeOx on Ni electrodes achieves high activity and stability, with overpotentials of 0.29 V and 0.35 V after multiple cycles. The stability of IrOx films prepared with different deposition solutions is also evaluated, showing that higher concentrations of IrCl6 lead to more stable catalysts. The study also discusses the use of Tafel plots for comparing electrocatalysts, but concludes that they are complex to interpret due to the multi-step nature of the OER. Finally, the study addresses the challenges of studying electrocatalysis at intermediate pH, where buffer and electrolyte selection can significantly affect electrochemical performance. The results highlight the importance of careful experimental design and the need for multiple studies to fully understand the behavior of electrocatalysts under different conditions.This paper presents a benchmarking study of heterogeneous electrocatalysts for the oxygen evolution reaction (OER). The study includes XPS spectra of various catalysts, including IrOx, CoOx, NiOx, NiCeOx, and others, which provide insights into their surface composition and oxidation states. The authors also discuss the choice of specific capacitance for electrochemical measurements, which is crucial for determining the electrochemically active surface area. The Pt surface area was measured using cyclic voltammetry and double-layer capacitance measurements. The study also includes representative current and potential steps for NiOx, as well as activity and stability measurements for various catalysts, including CoOx, CoFeOx, IrOx, NiCeOx, and others. The results show that NiCeOx on Ni electrodes achieves high activity and stability, with overpotentials of 0.29 V and 0.35 V after multiple cycles. The stability of IrOx films prepared with different deposition solutions is also evaluated, showing that higher concentrations of IrCl6 lead to more stable catalysts. The study also discusses the use of Tafel plots for comparing electrocatalysts, but concludes that they are complex to interpret due to the multi-step nature of the OER. Finally, the study addresses the challenges of studying electrocatalysis at intermediate pH, where buffer and electrolyte selection can significantly affect electrochemical performance. The results highlight the importance of careful experimental design and the need for multiple studies to fully understand the behavior of electrocatalysts under different conditions.