One pot production of Co core/carbon shell materials and their electrocatalytic properties

초록

The oxygen reduction reaction (ORR) is a kinetically sluggish reaction because it requires the transfer of four electrons. In this work, one-pot process involving thermal treatment of Co(II) acetylacetonate is developed. The resulting core-shell material (Co@C-800) consists of metallic Co cores encapsulated by carbon-based layered shells. Morphological analysis reveals the core-shell structures, with core particles surrounded by carbon networks. Chemical characterization using various spectroscopic techniques indicates the presence of metallic Co as the major component in Co@C-800, with minor Co species exhibiting higher oxidation states. Raman spectroscopy confirms the formation of sp2-hybridized carbon shells. Co@C-800 displays efficient electrocatalytic ORR performance, evidenced by high onset and half-wave potentials. The excellent durability and stability of Co@C-800, demonstrated through resistance to methanol poisoning and cyclic testing, suggest the potential of core-shell materials as a practical electrocatalyst.

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