Abstract
The nanostructured PtCux/C catalysts with an average nanoparticle size of 3–5 nm, which significantly surpass in activity the commercial Pt/C analog in the oxygen electroreduction reaction (ORR), were obtained by the chemical reduction. A detailed analysis of the activation potentials range effect on the catalysts electrochemical performance in particular, on the microstructure of bimetallic catalysts with small nanoparticles, has been carried out. The upper potential limit, which limited the range of the electrode activation potentials, had a significant effect on the PtCu/C catalysts mass activity and specific activity in the ORR, but does not affect to the electrochemically surface area and materials compositions. Thus, an important phenomenon has been noted in which materials with the same composition differ significantly in their functional characteristics in the ORR, depending on the electrochemical activation conditions. Original approach to electrochemical study is presented, which helps to understand the effect of the activation potentials range on the surface layers reorganization of bimetallic nanoparticles in catalysts.
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