Electrocatalytic Performance of a Carbon/Cobalt Paste Electrode for the Evolution of Hydrogen in a NaCl Medium Electrocatalytic Performance of a Carbon/Cobalt Paste Electrode for the Evolution of Hydrogen in a NaCl Medium

Saidi, Karim; Oubaouz, Mohamed; Mikou, Mohammed; Chtaini, Abdelilah; Kaddami, Mohammed

doi:10.22034/abec.2025.739012

Electrocatalytic Performance of a Carbon/Cobalt Paste Electrode for the Evolution of Hydrogen in a NaCl Medium Electrocatalytic Performance of a Carbon/Cobalt Paste Electrode for the Evolution of Hydrogen in a NaCl Medium

Document Type : Original Article

Authors

Karim Saidi ¹^{, 2}

Mohamed Oubaouz ³

Mohammed Mikou ²

Abdelilah Chtaini ³

Mohammed Kaddami ¹

¹ PCPM Lab, Faculty of Sciences and Technics, Hassan 1st University, Settat, Morocco

² LAVET, Faculty of Sciences and Technics, Hassan 1st University, Settat, Morocco

³ Electrochemistry and Molecular Inorganic Materials Team, Faculty of Sciences and Technics, Sultan Moulay Slimane University, Beni Mellal, Morocco

10.22034/abec.2025.739012

Abstract

This study focuses on the electrocatalytic performance of a cobalt-modified carbon paste electrode (CPE-Co) for hydrogen evolution (HER) reactions in a 0.1 M NaCl solution. Its efficiency for the hydrogen evolution (HER) reaction was evaluated using electrochemical techniques: CV, EIS, and Tafel plots. Compared to the unmodified electrode, CPE-Co shows significantly better electrocatalytic activity with higher current densities, reduced charge transfer resistance, and lower overpotentials. Cycling shows, an in-situ CoOx formation that appears to be associated with the formation of cobalt-based active species. These results demonstrate that the incorporation of cobalt accelerates electron transfer, proving that CPE-Co is a cost-effective, non-noble electrocatalyst for water electrolysis.

Keywords

Hydrogen evolution

Electrocatalysis

NaCl solution

Cobalt Oxide

Cobalt

Subjects