en گروه سطح پوشش و خوردگی Surface Coatings and Corrosion Research Paper Research Paper <span style="font-size:12pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""><span style="line-height:150%">In this study, Ni-Co-CeO₂ nanocomposite coatings were deposited on copper substrates via a sol-enhanced electrodeposition method. Cerium oxide nanoparticles were synthesized using cerium chloride precursor and HMTA as a precipitating agent at 70 &deg;C and subsequently added to a Watts bath containing nickel and cobalt ions. An investigation of the effect of deposition current density (10 to 30 mA.cm^-2) revealed that increasing the deposition current density reduced the cerium oxide content in the coating from 12.2 to 7.1 wt%. SEM images confirmed a morphological transformation from an acicular structure to a fine-grained microstructure with surface heterogeneity in the presence of the nanoparticles. XRD results further demonstrated grain refinement induced by the CeO₂ reinforcing phase. Electrochemical evaluations in 1 M KOH solution showed that the sample deposited at a current density of 20 mA.cm^-2 exhibited the highest performance, with a discharge time of 92 seconds (a 77% improvement compared to the particle-free sample) and optimal charge transfer resistance. This enhanced performance is attributed to a favorable balance between the electrical conductivity of the metallic matrix and the catalytic activity of the cerium oxide nanoparticles. The findings of this investigation substantiate the efficacy of the sol-enhanced method in designing advanced electrodes for energy systems.</span></span></span></span> ,Ni-Co-CeO2 coatings,sol-enhanced electrodeposition,CV,EIS,GCD 0 0 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-71-8&slc_lang=en&sid=1 Shayan Sarraf shayanhsarraf@gmail.com 1800319475328460022856 1800319475328460022856 No Postdoctoral Fellow, Iran University of Science and Technology Seyedeh Marzieh Hosseini mzh.hosseini@gmail.com 1800319475328460022857 1800319475328460022857 No PhD candidate, Iran University of Science and Technology Saeed rastegari rastegari@iust.ac.ir 1800319475328460022858 1800319475328460022858 Yes Associate professor of metallurgical engineering, Iran University of Science and Technology. Mansour Soltanieh mansour_soltanieh@iust.ac.ir 1800319475328460022859 1800319475328460022859 No Professor of Materials Engineering, Iran University of Science & Technology