Abstract
The use of hydrogen peroxide (H2O2) as an oxidant is considered a good alternative to oxygen for the cathodic process in liquid fuel cells. Herein, we studied the reduction of H2O2 at nickel and at nickel-rare earth (RE = Ce, Sm, Dy) alloys containing 5 and 10 at.% of RE metal. The alloys were prepared by arc melting, starting from the stoichiometric amounts of the two parent metals, and analyzed by X-ray diffraction and scanning electron microscopy coupled with energy-dispersive spectroscopy. The electrochemical characterization was carried out by voltammetry and chronoamperometry measurements in alkaline media. Ni0.95Ce0.05 alloy exhibited the highest catalytic activity for H2O2 reduction reaction, with a number of exchanged electrons of 1.7. Additionally, activation energies were estimated according to Arrhenius equation.
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