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1.Electrodeposition of Pt and Ru metal particles in acid solution of 0.5 M H2SO4 containing H2PtCl4and RuCl3cannot proceed with 100 % efficiency due to the possible
hydrogen evolution. The forming nuclei of nanoparticles will decrease the overpotential of hydrogen ions reduction. So, the process (hydrogen evolution on noble metal clusters) should proceed with a significant rate. Therefore,this suggests that the estimated masses of  metal deposits are far from real mass of clusters.
2.In addition, to my opinion, very simple  experiments could be done to make the interpretation more clear and the conclusion in the manuscript more reliable ¨C the
comparison of the EIS spectra in the presence and the absence of formic acid.
3.How about the degradation of catalysts in the presence of formic acid? The data on the  reproducibility and stability of electrochemical responses should be provided.
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