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 CoFe 2 alloy functionalized few‐layer graphene sheets (CoFe 2 /FLGs) by employing ferric nitrate, cobalt nitrate, and glucose as precursors. Various measurements conducted in this research confirm that the nanosized CoFe 2 alloy particles are evenly dispersed within the FLGs and possess significant magnetism. Electrochemical measurements reveal that the CoFe 2 /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 CoFe 2 /FLGs nanocomposite demonstrates excellent electrocatalytic performance and recyclability for the ORR, positioning it as a promising catalyst for fuel cells.