Evaluation of Bi-Functional Electrochemical Catalytic Activity of Co 3 O 4 -CoFe 2 O 4 Composite Spinel Oxide

Ji-Woo Park and Young-Wan Ju ()
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Ji-Woo Park: Department of Chemical Engineering, College of Engineering, Wonkwang University, Iksan 54538, Jeonbuk, Republic of Korea
Young-Wan Ju: Department of Chemical Engineering, College of Engineering, Wonkwang University, Iksan 54538, Jeonbuk, Republic of Korea

Energies, 2022, vol. 16, issue 1, 1-12

Abstract: Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are important for developing energy systems such as fuel cells and metal–air batteries. Precious metal catalysts, such as Pt and IrO 2 , have been considered electrochemical catalysts because of their excellent activity for the ORR and OER. However, their disadvantages, such as low durability for long-term operation and high price, necessitate the development of alternative electrochemical catalysts. Transition metal oxides with excellent electrical conductivity, high efficiency, and stability have been considered alternative electrochemical catalysts owing to their ORR and OER activities, which are similar to those of precious metal catalysts. Therefore, in this study, composite catalyst materials comprising Co 3 O 4 and CoFe 2 O 4 spinel oxides were synthesized via hydrothermal synthesis. The synthesized composite oxides exhibit bi-functional electrochemical catalytic activity for ORR and OER owing to the large active surface area and increased number of oxygen vacancies via the nanostrain in Co 3 O 4 nanoparticles.

Keywords: cobalt ferrite oxide; hydrothermal synthesis; oxygen reduction reaction (ORR); oxygen evolution reaction (OER); spinel oxide (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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