Preparation of AuPt Alloy Foam Films and Their Superior Electrocatalytic Activity for the Oxidation of Formic Acid

Abstract

AuPt alloy films with three-dimensional (3D) hierarchical pores consisting of interconnected dendrite walls were successfully fabricated by a strategy of cathodic codeposition utilizing the hydrogen bubble dynamic template. The foam films were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Due to the special porous structure, the electronic property, and the assembly effect, the AuPt alloy foam films show superior electrocatalytic activity toward the electrooxidation of formic acid in acidic solution, and the prepared 3D porous AuPt alloy films also show high activity and long stability for the electrocatalytic oxidation of methanol, where synergistic effect plays an important role in addition to the electronic effect and assembly effect. These findings provide more insights into the AuPt bimetallic nanomaterials for electrocatalytic applications.

Anodic stripping voltammetric analysis of trace arsenic(III) enhanced by mild hydrogen-evolution at a bimetallic Au–Pt nanoparticle modified glassy carbon electrode

“…1 (C, D) show many nanoparticles with 2050 nm and 2060 nm sizes uniformly distributed on the AuNPs/GCE (C) and Au-PtNPs/GCE (D) surfaces, respectively. The Pt/Au atomic ratio is calculated to be 1.46:98.54 according to the EDX spectra, being slightly larger than the Pt/Au concentration ratio in the feeding solution (1:500), as reported before [18]. The EDX elemental mapping proves that Pt and Au sites were uniformly distributed on the Au-PtNPs/GCE (Insets of Fig.…”

Insights into the superhydrophobicity of metallic surfaces prepared by electrodeposition involving spontaneous adsorption of airborne hydrocarbons

“…The peaks in Fig. 3(b) at 84.1/87.8 eV can be assigned to Au 0 4f 5/2 /4f 7/2 [55,56]. The C 1s spectrum shown in Fig.…”

Au as an efficient promoter for electrocatalytic oxidation of formic acid and carbon monoxide: a comparison between Pt-on-Au and PtAu alloy catalysts

“…Xu and co-workers [21] studied the electrocatalytic activity of PtAu alloy nanoparticles with 1:1 atomic ratio and demonstrated that the PtAu/C catalyst exhibited a higher activity for FA oxidation reaction than commercial Pt/C. Liu et al [34] developed a 3D porous AuPt alloy foam film catalyst with superior electrocatalytic activity toward FA oxidation. Huang et al [35] prepared a PtAu alloy catalyst by electrodeposition method for FA electrooxidation with the dehydration pathway.…”

“…Additionally, the surface composition of atomic Pt/Au ratio and the preparation method are significantly related to the electrocatalytic activity of bimetallic PtAu catalyst for FA oxidation reaction [13,[34][35][36]. In general, the high electrocatalytic activity of bimetallic PtAu catalyst has been ascribed to the special electronic effect [29,36,37], ensemble effect [11,20,30], and synergistic effect [34,38,39]. Many research findings have revealed that both Pt-onAu and PtAu alloy catalysts exhibited high electrocatalytic activity toward FA oxidation with much less CO ads than that on Pt catalyst surface.…”