Investigation of heteroatom's effect on nickel-cobalt oxide electrocatalyst for oxygen electrochemistry

Celia Belkessam (1) , Selma Bencherif (2) , Mourad Mechouet (3) , Naima Idiri (3) , Jalal Ghilane (2)

1 UMBB - Université M'Hamed Bougara Boumerdes
2 ITODYS (UMR_7086) - Interfaces, Traitements, Organisation et Dynamique des Systèmes
3 UMMTO - Université Mouloud Mammeri [Tizi Ouzou]

This work reports the synthesis of nickel cobalt oxides materials and their electrocatalytic performances toward the oxygen reduction and evolution reactions. Nickel cobalt oxides were synthesized using the sol-gel process with different precursors, nitrate, sulfate and chloride. The structural analyses display mesoporous and indicate the formation of nickel cobalt oxides spinel structure with a nanoparticles size ranging from 35 to 65 nm. Besides, the physico-chemical properties differ depending on the nature of the selected precursor's including the materials morphology and the chemical composition. The electrocatalytic investigations demonstrate that the catalytic activity toward ORR could be modulated between 2 and 4 electrons pathway depending on the used precursors. Regarding the oxygen evolution reaction, the sample prepared using sulfate displays the highest performance. Overall, our results confirm that the precursor's chemical composition, used during the nanomaterials synthesis, leads to tune the electrocatalytic performances toward ORR and OER.

Mots clés: Nickel cobalt oxide; Electrochemistry; Precursor's effect; Oxygen reduction reaction; Oxygen evolution reaction

Domaines: Autre; Catalyse

Celia Belkessam, Selma Bencherif, Mourad Mechouet, Naima Idiri, Jalal Ghilane. Investigation of heteroatom's effect on nickel-cobalt oxide electrocatalyst for oxygen electrochemistry. ChemPlusChem, 2020, 85 (8), pp.1710-1718. ⟨10.1002/cplu.202000436⟩. ⟨hal-02999632⟩