PdBi Single‐Atom Alloy Aerogels for Efficient Ethanol Oxidation

Abstract

Single-atom alloys (SAAs) have ignited a surge of unprecedented interest as the advanced nanomaterials and opened many opportunities for wide applications. Herein, 3D porous aerogels comprising ionic liquid (IL) functionalized PdBi SAA building blocks with atomically dispersed Bi on Pd nanowires (IL/ Pd 50 Bi 1 ) are synthesized with accelerated gelation kinetics, which could serve as high-efficiency electrocatalysts for ethanol oxidation reaction (EOR). Benefiting from the unique structures of aerogels including synergistic effects of PdBi SAA nanowire networks and interface engineering, the optimized IL/Pd 50 Bi 1 aerogels display a nearly fourfold enhancement in mass activity and boosted stability for EOR compared to commercial Pd/C. Density functional theory calculations further demonstrate that isolated Bi atoms on Pd nanowire networks decrease the energy barrier of the rate-determining step, resulting in excellent electrocatalytic activity for EOR. This work provides a promising method for developing efficient SAA catalysts for fuel electrooxidation.

PdPbAg alloy NPs immobilized on reduced graphene oxide/In2O3 composites as highly active electrocatalysts for direct ethylene glycol fuel cells

“…Therefore, the d-band center of Pd can be effectively tuned by modifying the Pd surface by doping with appropriate transition metals or alloying Pd. 16 In addition, metal particles supported on supports can promote the uniform dispersion of nanoparticles (NPs). For example, Pd-based bimetallic catalysts Pd-Cu 17 and Pd–Sn/Pd–Ni/CNT; 18 trimetallic catalysts PdCuBi/C, 19 Pd–Co–Ni/G 20 and Pd–Ru–Bi.…”

“…Pd-based materials have abundant storage and good catalytic activity, so they are oen used as effective active components in anodic alcohol oxidation reaction (AOR). 15,16 However, many studies have shown that single Pd catalysts have poor electrocatalytic performance and stability. Therefore, the d-band center of Pd can be effectively tuned by modifying the Pd surface by doping with appropriate transition metals or alloying Pd.…”

Nanoporous trimetallic PdCuAg alloys as efficient electrocatalysts by all-direction accessibility and synergetic effects

“…48 The complete oxidation of ethanol via the C1 pathway is supposed to be more efficient in utilizing ethanol. 49,50 Therefore, the reaction pathways of the EOR catalyzed by different catalysts were probed by quantifying the products. The liquid products accumulated at different potentials for 0.5 h were analyzed by 1 H nuclear magnetic resonance ( 1 H-NMR) and ion chromatography (IC).…”

Trace Iridium as ″Adhesive″ in PtCuIr Aerogels for Robust Methanol Electrooxidation

“…As a new appealing class of cutting-edge nanomaterials, noble metal aerogels (NMAs) are currently enjoying a flourish of extensive developments due to their plentiful interconnected channels, large surface area, and extremely low density. − Combining three-dimensional (3D) porous network architectures, excellent conductivity, and catalytic performance of noble metals, NMAs have caught tremendous attention in sensing, self-propulsion devices, and electrocatalysis. − The porous hybrid nanostructures can supply abundant free and open channels for fast electron transfer and mass transport, and the interconnected NWAs with anisotropic structures provide numerous active sites derived from high index facets, grain boundaries, kinetic steps, etc. Besides, self-supported properties can alleviate the support corrosion problem, which contributes to the enhancement of stability .…”