Phosphorus modification of cobalt–iron nanoparticles embedded in a nitrogen-doped carbon network for oxygen reduction reaction

Abstract

Phosphorus modification of cobalt–iron nanoparticles embedded in a nitrogen-doped carbon network can be used as an excellent oxygen reduction catalyst.

Effect of the Amount of Carbon/Nitrogen Feedstocks on Oxygen Reduction Reaction Activity of FeCoNi Nanoparticles Embedded in Nitrogen‐doped Carbon Matrix

“…This interwoven network structure can enhance the material's electrical conductivity, allowing better electron transport. [35] As shown in Figure 2b, metal particles present lattice fringes of d � 0.20 nm, attributed to Fe/Co/Ni, FeÀ CoÀ Ni alloys and their nitride compounds. Similarly, carbon materials outside the metal particles present d � 0.34 nm, attributed to the (002) crystal plane of carbon.…”

“…In Figure 2a, it can be seen that the black alloy particles are encapsulated in bamboo‐like NCs, and these bamboo‐like NCs and CNTs are interwoven to form a “carbonaceous network”. This interwoven network structure can enhance the material's electrical conductivity, allowing better electron transport [35] . As shown in Figure 2b, metal particles present lattice fringes of d ≈0.20 nm, attributed to Fe/Co/Ni, Fe−Co−Ni alloys and their nitride compounds.…”

Coupling between the 2D “Ligand” and 2D “Host” and Their Assembled Hierarchical Heterostructures for Electromagnetic Wave Absorption

“…As excepted, CoFe-PB-800 and CFCC@NC-800 are rich in N elements, which provide abundant loss centers for EMW. The N 1s spectra show four peaks at 398.4, 400.0, 401.0, and 402.7 eV (Figure e), which can be assigned to pyridinic N, pyrrolic N, graphitic N, and oxidized N, respectively . According to Figure f, the O 1s peaks at 530.2, 531.5, and 533.9 eV are associated with C–OH/C–O–C, and COOH bonds, respectively. , …”

“…The N 1s spectra show four peaks at 398.4, 400.0, 401.0, and 402.7 eV (Figure 2e), which can be assigned to pyridinic N, pyrrolic N, graphitic N, and oxidized N, respectively. 32 According to Figure 2f, the O 1s peaks at 530.2, 531.5, and 533.9 eV are associated with C−OH/C−O− C, and COOH bonds, respectively. 33,34 The microstructure and morphology of the samples are observed by SEM and TEM, as shown in Figure 3.…”

Facile Generation of a Stable Bi-Functional Mixed Phase Fe3O4/Fe-N4 Electrocatalyst for Rechargeable Zinc-Air Battery

“…14 To prevent aggregation or leaching out of catalytically active species, the electrocatalysts are anchored to a conductive carbon support 27 which additionally improves electronic conductivity as well as boosts the intrinsic activity of catalytically active sites. [28][29][30] The functionalization of carbon support 31 and the presence of defects in the structure 32 can synergistically coordinate with the transition metal species to further enhance their ability to catalyze OER and ORR. Fe-NC framework 33 has been widely accepted to present the ORR activity comparable to those of Pt-based noble metal catalysts.…”