Facile Synthesis of Porous Dendritic Bimetallic Platinum–Nickel Nanocrystals as Efficient Catalysts for the Oxygen Reduction Reaction

Abstract

Certain bimetallic nanocrystals (NCs) possess promising catalytic properties for electrochemical energy conversion. Herein, we report a facile method for the one-step synthesis of porous dendritic PtNi NCs in aqueous solution at room temperature that contrasts with the traditional multistep thermal decomposition approach. The dendritic PtNi NCs assembled by interconnected arms are efficient catalysts for the oxygen reduction reaction. This direct and efficient method is favorable for the up-scaled synthesis of active catalysts used in electrochemical applications.

Contiguous and Atomically Thin Pt Film with Supra‐Bulk Behavior Through Graphene‐Imposed Epitaxy

“…Core@shell structure of Au@Pt with monolayer thick Pt architecture showed lower activity due to electron drainage from Pt adatom, shifting d ‐band center up towards the Fermi level, where reaction intermediates adsorption affinity to catalyst surface is weakened . Ni@Pt showed remarkable ORR activity due to shifting d ‐band center down from the Fermi level (opposite to Au support counterpart) . The observation reported herein shows striking ORR activity by inducing strain from graphene on metal adatoms, meanwhile, observing ligand effect with through‐graphene electron transfer.…”

“…Core@shell structure of Au@Pt with monolayer thick Pt architecture showed lower activity due to electron drainage from Pt adatom, shifting d-band center up towards the fermi level, where reaction intermediates adsorption affinity to catalyst surface is weakened 13,32 . Ni@Pt showed remarkable ORR [33][34][35]…”

General Strategy for Synthesis of Pd3M (M = Co and Ni) Nanoassemblies as High‐Performance Catalysts for Electrochemical Oxygen Reduction

“…However, the large overpotential and sluggish ORR kinetics due to the multielectron transfer process requires an effective catalyst to facilitate the ORR. Platinum (Pt)‐based materials have been regarded as the most effective ORR catalysts, whereas extreme scarcity and high‐cost largely limit their practical applications . Substantial research efforts have been dedicated to substitute Pt by various strategies without compromising the electrocatalytic performance .…”

Modern Chemical Routes for the Controlled Synthesis of Anisotropic Bimetallic Nanostructures and Their Application in Catalysis

“…Dendritic alloy was reported by Kamel Eid and coworker in 2016 using the one pot co-reduction technique. The synthesized porous dendritic bimetallic Pt-Ni nanocrystals are highly efficient catalysts in oxygen reduction reaction (ORR) (Eid et al, 2016). The aqueous solution of K 2 PtCl 4 , Ni(NO 3 ) 2 , PVP, and AA under ultrasonic irradiation or magnetic stirring created dendritic or flower like nanocrystals of Pt-Ni synthesized, respectively.…”