Preparation and Electrocatalytic Oxygen Reduction Properties of P-Doped Reduced Graphene Oxide

초록

Phosphorus doping of graphene-based materials has emerged as a promising strategy to enhance their electrocatalytic properties for oxygen reduction reactions (ORR). In this study, phosphorus-doped reduced graphene oxide (P-rGO) is synthesized by a new reaction route using high-temperature pyrolysis of KOH-treated graphene oxide in the presence of phosphoric acid. Comprehensive structural and spectroscopic analyses reveal successful incorporation of P atoms into graphene-based networks. Electrochemical measurements show that metal-free P-rGO exhibits good ORR activity in alkaline media, with an onset potential of 0.88 V versus RHE, a half-wave potential of 0.71 V versus RHE, and a high electron transfer number of 3.93. Additionally, P-rGO demonstrated exceptional durability after 10,000 cycles, resistance to methanol poisoning, and favorable reaction kinetics, as supported by the low Tafel slope and enhanced charge transfer properties. This study highlights the critical role of phosphorus doping in enhancing the catalytic performance of graphene-based materials.

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