Nickel-Ion-Oriented Fabrication of Spiny PtCu Alloy Octahedral Nanoframes with Enhanced Electrocatalytic Performance

Abstract

Metal cation is an emerging type of morphology controlling agency in nanoscience, but has rarely been used in fabrication of hollow structures. Herein, with the addition of Ni 2+ ion, PtCu alloy octahedral nanoframes (PtCu AONFs) with plenty of spiny nanothorns on the apexes are synthesized via one-step hydrothermal reaction. Ni 2+ ion plays a pivotal role in forming hollow structures because it facilitates the diffusion of Cu atoms in the replacement reaction between initially formed Cu templates and PtCl 6 2− . The as-prepared PtCu AONFs show a superior electrocatalytical activity and durability toward oxygen reduction reaction (ORR) with a mass activity (MA) and specific activity (SA) of 0.28 A/mg Pt and 0.50 mA/cm 2 at 0.90 V vs reversible hydrogen electrode (RHE), which are 2.8-and 2.6-fold times that of commercial Pt/C (0.10 A/mg Pt and 0.19 mA/cm 2 ). In addition, the electrocatalytical oxidation property of PtCu AONFs toward methanol also better than that of commercial Pt/C. This study offers a new strategy for synthesizing hollow electrocatalysts with enhanced properties.

Ultrafast and surfactant-free synthesis of Sub-3 nm nanoalloys by shear-assisted liquid-metal reduction

“…Among these, the O element may be derived from the partial oxidation of the sample when it was placed in the air. 33,47 To prove the utility of the nanoalloys, the hydrogen evolution reaction (HER) performance of a series of Pt-Cu-vxc72 samples was performed and the results are shown in Fig. 6.…”

A New Generation of Platinum‐Copper Electrocatalysts with Ultra‐Low Concentrations of Platinum for Oxygen‐Reduction Reactions in Alkaline Media

“…It is noteworthy that our Pt−Cu NPs exhibit excellent activity on the bleeding edge, compared to most of the reported electrocatalysts . The high catalytic activity of Pt 0.25 Cu electrocatalyst may be due to optimum metal loading, the small size of NPs, twinned effects, and the excellent electron interaction . In this study, Pt−Cu NPs are rich in Cu, leading to enhanced catalytic activity.…”

“…In this study, Pt−Cu NPs are rich in Cu, leading to enhanced catalytic activity. The alloying Pt with 3d transition metals can change the electronic structure of Pt, thus prompting the O 2 reduction . The presence of Cu may enhance the OH ˗ generation, and thus improving CO tolerance .…”

Noble Metal Based Alloy Nanoframes: Syntheses and Applications in Fuel Cells

“…The synthesized PtCu AONFs showed enhanced activity and stability for ORR. The mass and specific activities were 2.8 and 2.6 times that of commercial platinum-carbon catalysts (Zhu et al, 2019). Furthermore, these PtCu AONFs also showed better results for MOR than Pt/C.…”