Electroreduction of H<SUB>2</SUB>O<SUB>2</SUB> by Co<SUB>3</SUB>O<SUB>4</SUB> and NiCo<SUB>2</SUB>O<SUB>4</SUB> Nanowires and <I>β</I>-Ni(OH)<SUB>2</SUB> Nanoplates Grown on Ni Foam
Kwun Nam HuiCui-Lei YinKwan San HuiJ. Y. LeeDianxue CaoGuiling Wang
Abstract
Nanowires (Co3O4 and NiCo2O4) and nanoplates (beta-Ni(OH)2) grown on Ni foam are successfully prepared by a template-free method and used as cathode electrodes for the electroreduction of H2O2, in an alkaline medium. Catalytic performance is investigated via cyclic voltammetry and chronoamperometry. The Co3O4 and NiCo2O4 nanowire electrodes exhibit much better catalytic activity, stability, and mass transfer properties for H2O2 electroreduction than pressed Co3O4 and NiCo2O4 nanoparticle/carbon/PTFE electrodes. A current density of 101.8 mA cm(-2) and 122.7 mA cm(-2) are respectively achieved on Co3O4 and NiCo2O4 nanowire electrodes at -0.4 V in 0.4 mol/L H2O2, and 3.0 mol/L NaOH solution at room temperature.
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