Direct peroxide–peroxide fuel cell – Part 1: The anode and cathode catalyst of carbon fiber cloth supported dendritic Pd

Abstract Dendritic Pd is electrodeposited uniformly on carbon fiber cloth via a potential pulse technique. The electrode is characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffractometer, and it shows a unique open structure allowing the full utilization of Pd surface active sites. H 2 O 2 electrooxidation in KOH solution and electroreduction in H 2 SO 4 solution on the dendritic Pd electrode are studied by linear sweep voltammetry and chronoamperometry. The electrode exhibits a high catalytic performance for both H 2 O 2 electrooxidation and electroreduction, and it outperforms the conventional electrode made with commercial Pd/C powder. KOH and H 2 SO 4 in excess show no improvement to the activity of H 2 O 2 oxidation and reduction, respectively. The overpotential at the same current density for H 2 O 2 electrooxidation in alkaline solution is significantly lower than that for electroreduction in acid medium on the dendritic Pd electrode.

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