First Report on High Entropy Alloy Nanoparticle Decorated Graphene

Abstract

This is the first report on synthesis of multimetal high entropy alloy (HEA) nanoparticle-few layer graphene composite. A two-step methodology for synthesizing multi-component HEA nanoparticle-graphene composite is provided. In the first step, high purity graphite powder was mechanically milled with metal powders (Ni, Cr, Co, Cu, Fe) to produce multimetal-graphite composite. This composite was then sonicated with sodium lauryl sulphate (SLS) for 2 hours to produce a dispersion of graphene decorated with multi-component nanoparticles with face centred cubic structure. Potentiodynamic polarization and electrochemical impedance spectroscopy methods revealed that the HEA nanoparticle graphene composite possess excellent corrosion resistance properties which was better than the corrosion resistance exhibited by milled and exfoliated graphene. The HEA nanoparticle-graphene composite can be used for corrosion resistant coating applications.

Reduced graphene oxide decorated with Ni-Fe-Mo permalloy obtained by sputtering

“…1b. The diffraction rings in the SAED pattern were calculated as r1 = 2.11 Å and r2 = 1.22 Å close to SAED pattern of rGO, this suggests that the rGO structure is not changed by sputtering permalloy, nevertheless permalloy/rGO diffraction pattern shows rings instead of diffraction spots, indicating a polycrystalline sample [25][26][27]. The permalloy diffraction rings in the SAED pattern (insert in Fig.…”

On the electronic structure and hydrogen evolution reaction activity of platinum group metal-based high-entropy-alloy nanoparticles

“…To date, the reports on HEA NPs are still scarce compared to HEA bulk, and almost all the syntheses require special techniques such as carbothermal shock, 10,18,19,21 spark ablation, 27 sputtering, 12 and mechanical ball milling. 28 Here, we show the chemical synthesis of single-phase HEA NPs consisting of Ru, Rh, Pd, Ir, and Pt in a nearly equal molar ratio by a simple onepot polyol method. We investigated the electronic structure of HEA NPs using hard X-ray photoelectron spectroscopy (HAXPES), which is the rst direct observation of the electronic structure of HEA NPs.…”

Recent Advances of High Entropy Alloys: High Entropy Superalloys

“…These liquid dye with about 50-100 nm compared to solids have a higher density of atoms and they are evenly distributed. These lasers with wide bandwidth are replaceable and are transferred from very intricate regions which are sometimes used as solutes in considerable solvents to develop gain mediums [107]. Coumarin, pyrromethene, exalite, pyridine, styryl and fluorescein are dyes used for pulsed or tunable lasers.…”