Sandwich-structured Au@polyallylamine@Pd nanostructures: tuning the electronic properties of the Pd shell for electrocatalysis

Abstract

We report herein the synthesis of core–shell sandwich Au@polyallylamine@Pd nanostructures, in which the electronic structure of the Pd shell can be strongly tuned by the medial polyallylamine layers.

Boosting the Oxygen Evolution Reaction Activity of NiFe2O4 Nanosheets by Phosphate Ion Functionalization

“…7,8 Currently, RuO x and IrO x are the best OER electrocatalysts, but suffer from high cost and resource scarcity. 9,10 Alternatively, in this context, considerable studies have concentrated on nonprecious metal-based electrocatalysts for OER, 11−16 and some low-cost transition metal (Fe, Ni, Co, Mn, etc.) oxides were applied to the OER because of their high electroactivity and stability in alkaline solutions.…”

Polyethyleneimine modified AuPd@PdAu alloy nanocrystals as advanced electrocatalysts towards the oxygen reduction reaction

“…S4). These experimental data demonstrate that the negative shift in Pd 3 d and Au 4 f binding energies originates from the binding of PEI on PdAu surface because the lone pair electrons of -NH 2 groups can strongly donate electrons to Au and Pd atoms [46] , which induces the negative shift in Pd 3 d and Au 4 f binding energies.…”

“…XPS, zeta potential and EDX maps were carried out to analyze the surface composition of AuPd@PdAu-PEI nanocrystals. The previous works have indicated the amino groups can strongly adsorb the noble metal surface because of the strong N-metal bond [43][44][45][46] . For AuPd@PdAu-PEI nanocrystals, the N 1 s XPS signal is detected ( Fig.…”

“…The shape of N element pattern is very close to the morphology of AuPd@PdAu nanocrystals, revealing the uniform distribution of PEI on AuPd@PdAu nanocrystals surface. This fact indicates that PEI can effectively act as a capping agent during the synthesis due to the bulky molecular size of PEI and the strong electrostatic repulsion between protonated PEI molecules [43][44][45][46] . Indeed, the AuPd alloy nanocrystals (AuPd-ANC) seriously aggregate in the absence of PEI (Fig.…”

Shape Controlled Synthesis of Au/Ag/Pd Nanoalloys and Their Oxidation-Induced Self-Assembly into Electrocatalytically Active Aerogel Monoliths

“…Over the past two decades, a variety of synthetic methods have been developed for the production of nanostructured noble metal alloys. − Higher cost and scarcity of the noble metals prompted the synthesis of low-cost alloy NPs, which in most cases exhibit comparable or superior physical properties to those of the single element metal NPs . Despite significant advances in the synthesis of bimetallic alloy NPs, size- and shape-controlled synthesis of ternary and quaternary noble metal nanostructures has not been thoroughly investigated.…”