Addressing Reviewer Comments on Figure Captions and Data Presentation in Electrocatalysis Manuscript

Thank you for your valuable feedback on the figure captions and data presentation in our manuscript. We deeply apologize for any inconvenience caused. We have thoroughly proofread and checked the titles of all figures, addressing the specific concerns raised:

• Figure 1 Caption: We have corrected the caption to accurately reflect the content, ensuring it ends with a period. For example, "... single Mo-PdCu-1/C particle."
• Figure 2c Caption: The caption now accurately describes the content as "Half-wave Potentials" instead of "Tafel plots."
• Figures 4e-4g Captions: We have added the missing captions for Figures 4e-4g, providing clear and concise descriptions of the data presented.
• Redundant Data Stating: We have eliminated unnecessary repetition of data points, directing readers to the relevant figures instead. For instance, we no longer explicitly state the half-wave potential values in the text when Figure 3c already displays them.

ECSA and ORR Activity Discussion:

We have revised the discussion on ECSA and ORR activity to enhance clarity and avoid redundancy. The CO stripping results, presented in Figure S13 and Table S3, demonstrate that Mo-PdCu-1/C exhibits the largest ECSA among the tested catalysts.

Figure 3b presents the ORR polarization curves for all samples. As evident from Figure 3c, all Mo-doped PdCu/C catalysts exhibit a more positive half-wave potential compared to PdCu/C, highlighting the effectiveness of Mo doping in enhancing the ORR activity of the catalyst.

We have highlighted all modifications in the revised manuscript for your ease of review. We sincerely appreciate your detailed feedback and the opportunity to improve the clarity, accuracy, and conciseness of our manuscript.