Lattice-Expanded PdAg Spatial Nanodendrites as Catalysts for the Ethanol Oxidation Reaction

Designing economical and efficient nanocatalysts to enhance the efficiency and commercialization potential of direct ethanol fuel cells (DEFCs) is a challenging task. In the present study, we have crafted PdAg spatial nanodendrites (NDs) featuring distinct morphologies and precise compositional control, employing a streamlined one-step solvothermal approach. Modulating the molar quantity of the AgNO3 precursor can substantially modify the morphology and alloy composition of PdAg nanodendrites. The addition of Ag to the PdAg NDs resulted in lattice expansion, causing a shift in the d-band center of Pd. In addition, the porous nature of PdAg NDs provides numerous active sites for catalytic reactions, significantly enhancing the activity and stability of the ethanol oxidation reaction (EOR). It is important to note that the PdAg NDs exhibit "volcano" characteristics. Among these, the Pd9Ag1 NDs demonstrate excellent electrocatalytic activity and outstanding stability. It has been found to have an electrocatalytic activity of 2450 mA mgpd–1 for ethanol oxidation. This study offers a solution for the preparation of catalysts for fuel cells and motivates the creation of innovative structures to improve electrocatalytic activities.