Regulating the morphology and structures of wet-chemical synthesized L1₀-FePtMn nanoparticles by applying magnetic fields

Abstract

We report an effective strategy to prepare the highly ordered L10-FePt nanoparticles (NPs) by a magnetic-field-assisted wet chemical synthesis. Mn element with high magnetic susceptibility was chosen as the third-element...

Small-Size Intermetallic FeMnPt Nanoparticles Electrocatalyst for HER Under Acidic and Alkaline Conditions

“…The diffusion and migration abilities of the Mn element are stronger than those of Fe and Pt, and it is easier to diffuse to the surface of NPs. The diffusion and migration of Mn also promote the disorder–order transition of L 1 0 -phase and increase the ordering degree of L 1 0 -FeMnPt NPs. , The Mn 2p spectra are shown in Figure (b). The binding energies of Mn 2p 1/2 and 2p 3/2 in L 1 2 -FeMnPt NPs are higher than those in L 1 0 -FeMnPt.…”

“…The diffusion and migration of Mn also promote the disorder−order transition of L1 0 -phase and increase the ordering degree of L1 0 -FeMnPt NPs. 28,47 The Mn 2p spectra are shown in Figure 5(b). The binding energies of Mn 2p 1/2 and 2p 3/2 in L1 2 -FeMnPt NPs are higher than those in L1 0 -FeMnPt.…”

“…The standard reduction potentials of Mn 2+ , Fe 3+ , and Pt 2+ are −1.185, −0.037, and 1.188 V, respectively. 28 The reduction of Mn 2+ is harder than those of Fe 3+ and Pt 2+ , resulting in the decrease of Mn and a relative increase of Pt content in the FeMnPt NPs.…”

“…If the addition amount of alloying elements (Fe, Mn, Cu, , and so on) is close to that of Pt, it is beneficial to create the L 1 0 -phase, while increasing the amount of alloying elements or Pt will facilitate the formation of L 1 2 -phase. − Typically, the transition metals Fe and Mn with higher abundance, more unpaired electrons, and lower electronegativity can generate unique electronic structures and magnetic properties to improve the activity and durability of catalysts after alloying with Pt. , The addition of Mn elements can also activate the Fe-site through spin state transition and electron modulation, thereby improving electron transport and presenting better catalytic activity in both acidic and alkaline solution . In addition, Pt-based intermetallic NPs with different ordered phases will be generated by adjusting the proportion of Fe and Mn elements, which is a reliable model for screening suitable catalysts to catalyze HER in acidic and alkaline service environments. ,, …”

“…26 In addition, Pt-based intermetallic NPs with different ordered phases will be generated by adjusting the proportion of Fe and Mn elements, which is a reliable model for screening suitable catalysts to catalyze HER in acidic and alkaline service environments. 18,27,28 The wet-chemical method can be used for synthesizing ordered Pt-based NPs. However, the reduction potential or thermal decomposition temperature of Fe, Mn, and Pt precursors is not consistent; hence, increasing the synthesis temperature to reduce these precursors simultaneously will increase the grain size of NPs.…”