کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
187124 | 459636 | 2013 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Dendritic palladium decorated with gold by potential pulse electrodeposition: Enhanced electrocatalytic activity for H2O2 electroreduction and electrooxidation Dendritic palladium decorated with gold by potential pulse electrodeposition: Enhanced electrocatalytic activity for H2O2 electroreduction and electrooxidation](/preview/png/187124.png)
• Dendritic Pd supported on CFC is decorated with Au via potential pulse technique.
• Au@Pd/CFC electrode shows high catalytic activity for H2O2 reduction and oxidation.
• DPPFC obtains a much higher performance based on the Au@Pd/CFC electrodes.
Dendritic Au@Pd nanocomposite is uniformly electrodeposited on carbon fiber cloth via a two-step potential pulse technique. The electrode (Au@Pd/CFC) is characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffractometer. It shows a unique open three dimensional structure allowing the full utilization of electrocatalyst. Au is uniformly distributed on the surface of Pd nano-dendrites. H2O2 electrooxidation in KOH solution and electroreduction in H2SO4 solution on the dendritic Au@Pd/CFC electrode are studied by linear sweep voltammetry, chronoamperometry and electrochemical impedance. The electrode exhibits a remarkably higher catalytic activity for both H2O2 electrooxidation and electroreduction than the Pd/CFC electrode. The effects of H2O2, KOH and H2SO4 concentration on the catalytic performance were investigated and the suitable ratios of [H2SO4]/[H2O2] and [KOH]/[H2O2] are determined to be 1 and 4. The cell using it both as the anode and cathode exhibits a much higher performance than those reported in the literatures, that an open circuit voltage is as high as 0.9 V and the peak power density can reach 20.7 mW cm−2 at 20 °C.
Journal: Electrochimica Acta - Volume 99, 1 June 2013, Pages 54–61