• P ANANDHA GANESH

      Articles written in Bulletin of Materials Science

    • Efficient electrocatalytic activity for oxygen reduction reaction by phosphorus-doped graphene using supercritical fluid processing

      S SURESH BALAJI P ANANDHA GANESH MEGALA MOORTHY M SATHISH

      More Details Abstract Fulltext PDF

      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.

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