Abstract
Palladium nanoparticle aggregates (Pd-NPAs) with various sizes were prepared by regulating the stability of Pd colloids. Structures of Pd-NPAs and their performances for electrooxidation of ethanol were investigated using power X-ray diffraction, transmission electron microscopy and electrochemical measurements. Experimental data illustrated that the size of Pd-NPAs, the concentration of electrolyte and the process of electrocatalysis jointly affected their electrocatalytic properties. The on-set potentials were negative-shifted during the electrocatalysis of ethanol as the concentration of KOH in the electrolytes continuously increased, while the catalytic current density reached the highest value in 2 M KOH electrolyte. The change of on-set potential, peak potential and peak current of Pd-NPAs during the electrooxidation of ethanol were systematically investigated and analyzed. A size-electrolyte-process mechanism was proposed to explain the variation of the electrocatalytic activity promoting in alkane media.
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