A CoFe₂ Alloy‐Functionalized Few‐Layer Graphene Sheet Nanocomposite as an Electrocatalyst of the Oxygen Reduction Reaction

Abstract

Searching for a high‐efficiency, recycled and cheap catalytic material for oxygen reduction reaction (ORR) is urgently needed in fuel cells. In this study, we successfully fabricated a nanocomposite consisting of CoFe2 alloy functionalized few‐layer graphene sheets (CoFe2/FLGs) by employing ferric nitrate, cobalt nitrate, and glucose as precursors. Various measurements conducted in this research confirm that the nanosized CoFe2 alloy particles are evenly dispersed within the FLGs and possess significant magnetism. Electrochemical measurements reveal that the CoFe2/FLGs exhibit a high positive onset potential (0.901 V), follow a four‐electron pathway, display a low Tafel slope (77.21 mV/dec), possess a low charge‐transfer resistance (∼72 Ω), and exhibit strong methanol tolerance. Consequently, the resulting CoFe2/FLGs nanocomposite demonstrates excellent electrocatalytic performance and recyclability for the ORR, positioning it as a promising catalyst for fuel cells.

Construction of core‐shell heterostructured MnO@Co/NC for enhancing the oxygen electrocatalytic performance

“…[4,5] Nevertheless, the sluggish reaction kinetics of oxygen reduction reaction (ORR) on air electrodes still severely constrain their real-world applications. [6,7] To realize optimal functionality, Ptbased catalysts are commonly employed to enhance the ORR activity. However, in the long run, the scarcity and high costs associated with precious metal catalysts will be a major obstacle to the further advancement of ZnÀ air batteries.…”

“…Zn−air batteries (ZABs) have garnered considerable interest due to their impressive energy density (approximately 1086 Wh kg −1 ), affordability, straightforward structure, and potential for practical application [4,5] . Nevertheless, the sluggish reaction kinetics of oxygen reduction reaction (ORR) on air electrodes still severely constrain their real‐world applications [6,7] . To realize optimal functionality, Pt‐based catalysts are commonly employed to enhance the ORR activity.…”