108277 20230519145343.0 doi 10.1016/j.electacta.2020.137234 sideral 121236 ART-2021-121236 eng Nellaiappan, S. Platinum substituted Cobalt(II, III) Oxide: Interplay of tetrahedral Co(II) sites towards electrochemical oxygen evolution activity 2021 Access copy available to the general public Unrestricted Substitution of ionic platinum is carried out in Co3O4 host synthesized by solution combustion strategy. These Pt substituted Co3O4 spinels characterized by XRD show pure crystalline phase of Co3O4 without any separated peaks related to Pt/PtOx. Electrochemical OER activities of these spinels are investigated by cyclic voltammetry, linear sweep voltammetry and chronoamperometry in neutral, alkaline and neutral buffer electrolytes. LSV studies on 1% Pt substituted Co3O4 exhibit a low overpotential (¿) of 455 mV at 20 mA cm-2 in KOH, as compared to PBS medium. Tafel slope value of 117 mV dec-1 in KOH represents one electron EC mechanism. The detailed XPS studies indicate that Pt doping increases the tetrahedral Co2+ sites of Co3O4. XPS studies before and after OER also infers that the mixed valence of Co in the host (Co3O4) undergoes redox (Co2+/Co3+) changes with simultaneous reduction in Pt dopant from Pt4+ to Pt2+ influencing the OER activity. info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 7.336 2021 ELECTROCHEMISTRY 7 / 30 = 0.233 2021 Q1 T1 1.306 2021 Chemical Engineering (miscellaneous) 2021 Q1 Electrochemistry 2021 Q1 12.3 2021 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Jhariya, N. Irusta, S. Universidad de Zaragoza (orcid)0000-0002-2966-9088 Singhal, A. 5005 790 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Tecnologi. Medio Ambiente 365 (2021), 137234 [9 pp] Electrochim. acta Electrochimica Acta 0013-4686 1193497 http://zaguan.unizar.es/record/108277/files/texto_completo.pdf Postprint 912639 http://zaguan.unizar.es/record/108277/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:108277 articulos driver 2023-05-18-13:17:58 ARTICLE