Three‐Dimensional Super‐Branched PdCu Nanoarchitectures Exposed on Controlled Crystal Facets

Abstract

Despite the great success of controlled synthesis of metal nanocrystals with various sizes and morphologies, an efficient one-pot approach to preparing well-organized three-dimensional (3D) structures with unique facets exposed remains a great challenge. Herein, we report a unique 3D nanoarchitecture for PdCu alloy, created by a simple chemical reduction method, in which nanosized octahedral PdCu nanocrystals are directly assembled into 3D super-branched structures. Detailed investigations of its electrocatalytic performance demonstrate that the as-prepared facet-controlled PdCu super-branched nanostructures possess higher activity towards the formic acid oxidation reaction in comparison to the commercially available Pd black catalyst.

Facile Synthesis of PdCu Echinus‐Like Nanocrystals as Robust Electrocatalysts for Methanol Oxidation Reaction

“…The shifts are caused by the donation of electrons from Cu atom to Pd atom. And it suggests the downshift of d‐band center, which can promote desorption of carbon oxide on the surface of Pd …”

“…And it suggestst he downshift of d-band center,w hich can promote desorption of carbon oxide on the surfaceofPd. [38,51] In order to study the formation process of echinus-like PdCu NCs, the products collected in different times were characterized by FE-SEM.A ss hown in Figure S1(a), the nanoparticles with an average size of 50 nm were formed in the first half hour.A fter 1houro fr eaction, the size of the particles was increased and numerouss hort branches can be clearly observed in PdCu NCs (Figure S1(b)). After 2hours of reaction, the uniform echinus-like nanostructures were generated ( Figure S1(c)).…”

“…The majority of methods published previously for synthesizing echinus‐like or dendrite‐like nanoarchitectures usually involve organic solvents or templates. These organic solvents such as oleylamine (OAM), N ‐methyl‐2‐pyrrolidone (NMP), 1‐methylimidazole and N , N ‐dimethylformamide (DMF) are either environmentally hazardous or difficult to remove . And the synthesis of echinus‐like nanoarchitectures by using templates are usually complicated and time‐consuming in operation .…”

“…These organic solvents such as oleylamine (OAM), Nmethyl-2-pyrrolidone (NMP),1 -methylimidazole and N,N-dimethylformamide (DMF) are either environmentally hazardous or difficult to remove. [34,[37][38][39] And the synthesis of echinus-like nanoarchitectures by using templates are usually complicated and time-consuming in operation. [36,40] Consequently,t he facile preparation of Pd-based echinus-like nanomaterials with superior electrocatalytic properties is extremely desirable.…”

A general strategy to the synthesis of carbon-supported PdM (M = Co, Fe and Ni) nanodendrites as high-performance electrocatalysts for formic acid oxidation

“…Pd-based nanocrystals are generally regarded as efficient electrocatalysts toward the electrooxidation of organic fuel molecules, such as formic acid and alcohol [43][44][45] . It has been also welldocumented that incorporation of 3 d transition metals (M) into Pd to form PdM alloys can effectively enhance the electrocatalytic performances, including activity and antipoisoning capability [46][47][48] . Stimulated by the highly open and dendritic nanostructure and alloyed composition of the as-fabricated PdCo nanodendrites/C sample, we therefore investigated their electrocatalytic performance toward the FAOR.…”