Nitrogen-doped carbon-encapsulated SmFeOx bimetallic nanoparticles as high-performance electrocatalysts for oxygen reduction reaction

Construction of Bimetallic-Anchored Two-Dimensional Nanosheets on COF for Rechargeable Zinc-Air Batteries

“…Figure b shows the high-resolution XPS convolution of C 1s into three peaks located at 286.9, 285.2, and 284.6 eV belonging to O–CO, C–N/CN, and C–C. The presence of the C–N/CN bond indicates that the nitrogen atoms were successfully doped into the lattice of the carbon atoms, which facilitates the exposure of the active sites. , The N 1s energy spectrum shown in Figure c is divided into four prominent peaks containing pyridine-N (398.6 eV), pyrrole-N (399.1 eV), graphitic-N (401.1 eV), and oxidized-N (402.1 eV). Because of the mutual doping of C and N, the two atoms can influence the spin density and charge distribution, which leads to an increase in the stability of the carbon carriers and promotes the ORR/OER reaction process. , The high-resolution XPS convolution of O 1s in Figure d shows three fitted peaks with three types of O: lattice oxygen (O L , ∼531.1 eV), oxygen vacancies (O v , ∼531.9 eV), and chemisorbed oxygen (O c , ∼533.2 eV) .…”

“…The surface elemental composition and bonding state of the catalysts were further analyzed by X-ray photoelectron spectroscopy (XPS) measurements. The presence of C1, N1, O1, Fe2, and Co 2p is demonstrated in Figure 4a, indicating 38,39 The N 1s energy spectrum shown in Figure 4c is divided into four prominent peaks containing pyridine-N (398.6 eV), pyrrole-N (399.1 eV), graphitic-N (401.1 eV), and oxidized-N (402.1 eV). Because of the mutual doping of C and N, the two atoms can influence the spin density and charge distribution, which leads to an increase in the stability of the carbon carriers and promotes the ORR/OER reaction process.…”

Graphene-Loaded Bimetallic Oxide Nanoparticle Oxygen Electrode Materials for Rechargeable Zinc–Air Batteries

“…Moreover, eq 4 in the Supporting Information in the range of 3.70–3.87 confirms the K–L results. To confirm the catalyst and ORR catalytic pathway of Pt/C, rotating ring disc electrode measurements − were conducted to measure the formation of peroxide (H 2 O 2 ) in the potential range of 0.3–0.7 V, as seen in Figure e. The catalyst yielded H 2 O 2 yields below 21% in this range.…”

Metal–Organic Skeleton-Derived P-CoFe2O4@CN Nanoparticles Embedded with Nitrogen-Doped Carbon as Effective Electrocatalysts for the Oxygen Evolution Reaction

“…Metal–organic framework (MOF) materials are a class of organic–inorganic hybrid materials with a wireless network structure formed by the self-assembly of metals and ligands through ligand bonds. − Because of their extremely high specific surface area, porosity, pore size, and function tunability, they have a wide range of applications in electrocatalysis. As its unique structure can fully expose bare defects to achieve an increase in the number of active sites, it provides an extremely important insight for the replacement of precious metal catalysts by OER due to its special characteristics. , Metal phosphides derived from MOF materials usually do not change their original appearance, so they can be prepared with a tunable ordered structure, which is favorable for electron transfer. , Moreover, according to the literature research, the positive charge of P in transition metal phosphides can improve the reaction with hydroxyl groups − so as to achieve more convenient recombination to form metal oxides, hydroxides, or hydroxyl oxides, which will enable the catalysts to act as active sites in the OER during the catalytic process to improve the catalytic performance. − …”