Platinum substituted Cobalt(II, III) Oxide: Interplay of tetrahedral Co(II) sites towards electrochemical oxygen evolution activity

Substitution of ionic platinum is carried out in Co3O4 host synthesized by solution combustion strategy. These Pt substituted spinels characterized XRD show pure crystalline phase without any separated peaks related to Pt/PtOx. Electrochemical OER activities these are investigated cyclic voltammetry, linear sweep voltammetry and chronoamperometry neutral, alkaline neutral buffer electrolytes. LSV studies on 1% exhibit a low overpotential (η) 455 mV at 20 mA cm−2 KOH, as compared PBS medium. Tafel slope value 117 dec−1 KOH represents one electron EC mechanism. The detailed XPS indicate that doping increases the tetrahedral Co2+ sites Co3O4. before after also infers mixed valence Co (Co3O4) undergoes redox (Co2+/Co3+) changes with simultaneous reduction dopant from Pt4+ Pt2+ influencing activity.