Engineering of Hollow PdPt Nanocrystals via Reduction Kinetic Control for Their Superior Electrocatalytic Performances

Abstract

Synthesis of hollow metal nanocrystals (NCs) is greatly attractive for their high active surface areas, which gives rise to excellent catalytic activity. Taking PdPt alloy nanostructure as an example, we designed a synthetic tactic for the preparation of hollow metal nanostructures by delicate control over the difference in the reduction kinetic of metal precursors. At a high reduction rate difference, the Pd layer forms from HPdCl and is subsequently etched, leading to the formation of a hollow space. A solid PdPt structure is achieved when the reduction rate of Pd and Pt precursor is comparable. Obviously, the hollow space and composition are tunable as well by adjusting the reduction rate difference. More importantly, the prepared hollow PdPt nanostructures exhibit a branched outer, porous wall, and rough hollow interior. The branched outer and rough hollow interior provide the higher density of unsaturated atoms, whereas the porous wall serves as channels connecting the inner, outer, and reactive agents. Moreover, the periodic self-consistent density function theory suggests that the d-band theory density of state of the PdPt nanoalloys is upshifted in comparison to the monometallic component, which will beneficial for improvement in their catalytic performances. Electrocatalytic tests reveal that the PdPt bimetallic NCs, especially for PtPd nanostructures, show excellent catalytic activity and stability toward methanol oxidation reaction owing to their special structures as well as compositions.

NIR Stimulus-Responsive PdPt Bimetallic Nanoparticles for Drug Delivery and Chemo-Photothermal Therapy

“…PdPt NPs were generated based on a protocol previously reported [ 21 ]. In brief, the seed solution was formed by adding the ice-cold NaBH 4 (0.01 M, 600 µL) into H 2 PtCl 6 (0.01 M, 100 µL) and CTAC (0.1 M, 10 mL) mixture to generate Pt NPs as the seeds.…”

“…Plenty of PdPt heteronanostructures, including polyhedral shapes nanocrystals [ 16 , 17 , 18 ], nanoplates [ 19 ] and porous nanodendrites, [ 20 , 21 ] have been synthesized to improve their electrocatalytic activity towards oxygen reduction reactions, methanol oxidation reactions and ethanol oxidation reactions. Importantly, PdPt nanoplates were reported to exert a photothermal effect in Pd@Pt-PEG-Ce6 nanocomposite that facilitate permeation of photosensitizer Ce6 into breast cancer cells with enhanced efficacy of photodynamic therapy [ 19 ].…”

“…The porous structure provides NPs with high loading capacities for anti-cancer drugs [ 15 ]. Fang et al synthesized porous nanostructures of PdPt through an easily operated synthetic routine with the regulation of reduction kinetic of the metal precursors [ 21 ], while the possibility of porous PdPt NPs used as efficient vehicles for drug delivery and photothermal agents remains to be elucidated.…”

Ultralong Ternary PtRuTe Mesoporous Nanotubes Fabricated by Micelle Assembly with a Self‐Sacrificial Template

“…The methanol oxidation reaction (MOR) is crucial to DMFCs, and developing high‐efficiency, stabilized, and economical electrocatalysts for the MOR is important for the broad deployment and widespread commercialization of DMFCs . It is known that platinum nanomaterials are significant catalysts, owing to their outstanding performance in catalyzing the MOR . However, the high cost, low utilization, and CO poisoning of Pt materials hinder their development .…”

“…[1][2][3][4][5][6] It is known that platinum nanomaterials are significant catalysts, owing to their outstandingperformance in catalyzing the MOR. [7][8][9][10][11][12][13][14] However,t he high cost, low utilization, and CO poisoning of Pt materials hinder their development. [15][16][17][18][19] Great efforts have been devoted to developing promisingP t-basedc atalysts, such as reducing catalyst expense, combining Pt with transition metals,a nd modifying the electronic structure.…”