Electrochemical atomic layer deposition was used to form bimetallic (BiPd, CuPd) and trimetallic (CuBiPd) thin films via surface‐confined reactions. Pd thin films were characterized by cyclic voltammetry, scanning electron microscopy (SEM) and the alloy formation with preferred Au/Pd(111) orientation was confirmed by XRD. AFM revealed uniform grain distribution, with 3D islands growing on CuBiPd. EDX verified the presence of all deposited elements. Compared to other prepared catalysts, CuBiPd catalyst showed higher activity and stability towards the ethanol oxidation reaction (EOR), as confirmed by the peak current and onset potential trends, respectively: CuBiPd (1.35 mA, −0.450 V)>CuPd (0.6016 mA, −0.442 V)>BiPd (0.275 mA, −0.384 V)>Pd (0.186 mA, −0.350 V). The EOR current on CuBiPd improved by 2.5 folds relative to Pd. The results show that CuBiPd electrocatalyst is a promising material for EOR with enhanced catalytic properties for direct ethanol fuel cell
Herein, we report electro-synthesis of BiTePd using electrochemical atomic layer deposition (E-ALD). Scanning electron microscopy, energy-dispersive spectroscopy, atomic force microscopy, and X-ray diffraction were used to characterize Pd-based thin films' surface morphology and structure composition. BiTePd electrocatalyst exhibits higher electrochemical activity, stability and electron transfer kinetics using cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. The higher peak current and more negative onset potential is observed for ternary (BiTePd) nanofilm electrocatalyst towards ethanol oxidation reaction, according to this order: BiTePd= (1.26 mA; -055 V)> TePd = (0.527 mA; -0.535 V) >BiPd = (0.24 mA; -0.39 V) >Pd (0.13 mA; 0.35 V). Moreover, BiTePd = Rct (2.01kΩ) gave the faster interfacial charge transfer than TePd =2.42 kΩ, BiPd= 3.97 kΩ and Pd = 14 kΩ. BiTePd nanofilm demonstrates promising characteristic features of an active electrocatalyst for a direct ethanol fuel cell.
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