A bunch of researchers from the Analysis Centre for Laser Excessive Manufacturing on the Ningbo Institute of Supplies Expertise and Engineering, Chinese language Academy of Sciences, have created a laser solid-phase synthesis technique to create graphene-shell encapsulated CrMnFeCoNi nanoparticles on a three-dimensional porous carbon help. This analysis was just lately printed within the journal Gentle: Science & Purposes.
The fast synthesis of high-entropy alloy nanoparticles (HEA NPs) provides new alternatives for creating practical supplies for numerous purposes. Nonetheless, whereas a number of strategies have efficiently produced HEA NPs, their sensible use is restricted by the stringent circumstances sometimes required, similar to excessive strain, excessive temperature, managed environments, and restricted substrate choices.
The researchers mentioned, “Completely different from laser ablation in liquid, the laser solid-phase synthesis approach is a bottom-up method, based mostly on the laser irradiation of combined steel precursors in solid-phase adsorbed on a 3D porous construction of laser-induced graphene to supply HEA nanoparticles.”
They added, “1) the CrMnFeCoNi HEA nanoparticles are embraced by a number of graphene layers, forming graphene shell-encapsulated nanoparticles. 2) the synthesis may be achieved by way of combined steel precursor adsorption, thermal decomposition, and discount through electrons from laser-induced thermionic emission, and the synthesis solely takes lower than 1 ms; 3) this system additionally presents excessive versatility, evidenced by the profitable synthesis of a number of supplies together with CrMnFeCoNi oxide, sulfide, and phosphide nanoparticles.”
“4) the laser-synthesized graphene shell-encapsulated CrMnFeCoNi NPs on the carbon help exhibit wonderful electrocatalytic exercise in the direction of oxygen evolution response with an overpotential of 293 mV on the present density of 10 mA/cm2 and distinctive stability over 428 hours in alkaline media, outperforming the business RuO2 catalyst and the related catalysts reported utilizing different strategies. The catalyst productiveness is round 30g/h at a laser energy of 35 W, which may very well be scaled up,” the crew continued.
“Our technique supplies simplicity, generality, and tunability to synthesize phase-separation-free HEA nanoparticles which encompass immiscible parts. The graphene shell encapsulated HEA nanoparticles loaded on the carbon help may be immediately used as 3D binder-free built-in electrodes, embodying the scalability of this synthesis approach. This technique is economically possible and technically viable to synthesize composition-tunable nanoparticles,” the group added.
“As well as, this system could also be utilized as a fast instrument for high-throughput screening and data-driven discovery of HEA supplies, within the improvement of catalysis and different purposes,” the crew concluded.
Journal Reference:
Liu, Y., et al. (2024) Laser solid-phase synthesis of graphene shell-encapsulated high-entropy alloy nanoparticles. Gentle Science & Purposes. doi.org/10.1038/s41377-024-01614-y.
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