Abstract
This work reports the synthesis of palladium-based nanoalloys of zinc in different atomic ratio via a sonochemical process and investigation of their activities for formic acid electro-oxidation. The bimetallic nanoalloys are characterized by powder X-ray diffractometry (XRD) and inductively coupled plasma-atomic emission spectroscopy (ICP-AES) to determine their crystal structures and elemental compositions. Alloy formation of the nanocatalysts is proven by energy dispersive x-ray spectroscopy line profiles using field emission scanning electron microscopy (FESEM). The PdnZn/VC catalysts (1 ≤ n ≤ 3) showed better performance for the anodic oxidation of formic acid than Pd/VC. Activities based on the current densities are in the order of Pd2Zn > Pd3Zn > Pd1Zn. Compared with Pd/VC catalyst, the anodic peak potential of formic acid shifted toward negative value by ∼30 mV at the Pd2Zn/C catalyst electrode. Pd2Zn/VC also exhibits high stability, suggesting that this bimetallic alloy is a good candidate for the formic acid fuel cell.
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