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    • Keywords


      Supercritical fluids; P-doped graphene; triphenylphosphine; ORR; electrocatalyst.

    • Abstract


      Oxygen reduction reaction (ORR) plays a vital role in various fields, such as combustion, corrosion and fuel cell applications. Herein, we report the production of phosphorus-doped reduced graphene oxide (P-RGO) using triphenylphosphine as a phosphorus source and graphene oxide in supercritical fluid method. The ratio of phosphorus source and graphene oxide has been varied to obtain optimum P-doping. P-RGO materials are characterized through X-raydiffractometer, Raman, field emission scanning electron microscopy and X-ray photoelectron spectroscopy techniques. The electrocatalytic activity of P-RGO materials are studied using linear sweep voltammetry and their ORR performanceare evaluated using linear sweep voltammetry-rotating ring disk electrode studies in 0.1 M KOH electrolyte. Among the three different P-RGO materials, RGO with phosphorus doping (2:1) delivered the best ORR performance (0.75 A mg$^{-1}$) compared to commercial HiSPEC Pt/C (0.12 A mg$^{-1}$) catalyst. The enhanced ORR activity could be ascribed to the existence of surface-active phosphorous sites over the RGO sheet surface.

    • Author Affiliations



      1. Electrochemical Power Sources Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630003, India
      2. School of Material Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
      3. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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