The paper "Unraveling and Resolving the Inconsistencies in Tafel Analysis for Hydrogen Evolution Reactions" by Chengzhang Wan, Yansong Ling, Sibo Wang, Heting Pu, Yu Huang, and Xiangfeng Duan explores the inconsistencies in Tafel slope measurements for hydrogen evolution reactions (HER) and hydrogen oxidation reactions (HOR). The authors systematically investigate the loading- and potential-dependent nature of Tafel slopes derived from linear fitting of polarization curves in N2-saturated electrolytes. They find that these slopes can significantly exceed theoretical limits due to locally trapped HER-generated H2 in the catalyst layer, which offsets the HER current at lower overpotentials and suppresses further HER current growth at higher overpotentials. The Butler–Volmer (B–V) method, which accounts for both HER and HOR currents, is proposed as a more reliable approach for pure Pt catalysts but is less suitable for transition-metal decorated Pt surfaces due to potential-dependent surface oxidation states and reaction mechanisms. The study emphasizes the need for strict controls in Tafel slope analysis to ensure reliable comparisons among different catalyst systems.The paper "Unraveling and Resolving the Inconsistencies in Tafel Analysis for Hydrogen Evolution Reactions" by Chengzhang Wan, Yansong Ling, Sibo Wang, Heting Pu, Yu Huang, and Xiangfeng Duan explores the inconsistencies in Tafel slope measurements for hydrogen evolution reactions (HER) and hydrogen oxidation reactions (HOR). The authors systematically investigate the loading- and potential-dependent nature of Tafel slopes derived from linear fitting of polarization curves in N2-saturated electrolytes. They find that these slopes can significantly exceed theoretical limits due to locally trapped HER-generated H2 in the catalyst layer, which offsets the HER current at lower overpotentials and suppresses further HER current growth at higher overpotentials. The Butler–Volmer (B–V) method, which accounts for both HER and HOR currents, is proposed as a more reliable approach for pure Pt catalysts but is less suitable for transition-metal decorated Pt surfaces due to potential-dependent surface oxidation states and reaction mechanisms. The study emphasizes the need for strict controls in Tafel slope analysis to ensure reliable comparisons among different catalyst systems.