High entropy alloy nanoparticles encapsulated in graphitised hollow carbon tubes for oxygen reduction electrocatalysis

Abstract

High entropy alloys (HEAs) with tunable alloy composition and fascinating synergetic effects between various metals have raised significant attention in the field of electrocatalysis, but the potential is limited by...

Synthesis of metallic high-entropy alloy nanoparticles

“…Yao and co-workers reported that a solid-state precursor containing various metal ions and 2-methylimidazole was pyrolyzed at 1000 °C under Ar to produce HEA nanoparticles encapsulated in N-doped hollow carbon nanotubes. 102 The solid-state precursor can be synthesized by following several steps: mixing metal salts including Zn(NO 3 ) 2 , FeCl 3 , CoCl 2 , NiCl 2 , MnCl 2 , and CuCl 2 thoroughly via grounding in a mortar; mixing the salt mixture with 2-methylimidazole thoroughly; and heating the mixture at 170 °C for 1 h.…”

Future prospects of high-entropy alloys as next-generation industrial electrode materials

“…20d and e ). 315 The in situ XRD technique provided insights into the evolution of HEAs, identifying their formation point at approximately 908 K during the carbonization process ( Fig. 20f ).…”

“…Copyright 2023, Elsevier Ltd. (d and e) TEM image of a HEA, (f) in situ Raman spectra of a HEA system, and (g and h) ORR performance of a HEA. Reproduced with permission 315. Copyright 2023, The Royal Chemical Society.…”

Optimization strategies of high-entropy alloys for electrocatalytic applications

“…The ORR process contains multiple steps and a variety of reaction intermediates, which is an important part of fuel cells and metal–air batteries. 107,108 The ORR involves a variety of intermediates, mainly including the initial reduction and decomposition of , as well as the removal of adsorbed O*, HO* and H 2 O* (Fig. 8a).…”