PtCoNb2O5/graphene as electrocatalyst towards oxygen reduction reaction in alkaline and acidic media

Virginija Kepenienė; Raminta Stagniūnaitė; Loreta Tamašauskaitė-Tamašiūnaitė; Vidas Pakštas; Eugenijus Norkus

doi:10.6001/chemija.v29i1.3642

Virginija Kepenienė
Raminta Stagniūnaitė
Loreta Tamašauskaitė-Tamašiūnaitė
Vidas Pakštas
Eugenijus Norkus

DOI: https://doi.org/10.6001/chemija.v29i1.3642

Keywords: platinum–cobalt, niobium(V) oxide, electrocatalysts, oxygen reduction

Abstract

The aim of the study was to prepare and to investigate the catalytic activity of the Nb₂O₅/graphene-supported platinum–cobalt catalyst for the oxygen reduction reaction (ORR) in alkaline and acidic media. Electrocatalytic properties of the prepared catalyst towards the oxygen reduction reaction were characterized by using cyclic voltammetry (CV) and rotating disk electrode (RDE) linear sweep voltammetry (LSV).

It has been found that the PtCoNb₂O₅/graphene catalyst shows more positive onset potentials, as well as higher current in the mixed-kinetic-diffusion region towards the oxygen reduction reaction in both alkaline and acidic solutions as compared with those for the bare Pt/GR catalyst.