MnO nanoparticles loaded on three-dimensional N-doped carbon as highly efficient electrocatalysts for the oxygen reduction reaction in alkaline media

Hierarchical Porous Carbon Spheres Loaded CoOX (CoOx/HPCS) for Efficient Oxygen Reduction Reaction in Alkaline Media

“…Transmission electron microscopy (TEM) was recorded to characterize the morphology property of the as-synthesized electrocatalysts. [31] As shown in Figure 1b, the shape of the nanostructure of HPCS was spherical with the average particle size of about 660 nm (Figure S1). The morphology of hierarchical porous carbon spheres loaded with CoO x (CoO x /HPCS) was shown in Figure 1c, which also showed spherical shape.…”

“…Transmission electron microscopy (TEM) was recorded to characterize the morphology property of the as‐synthesized electrocatalysts [31] . As shown in Figure 1b, the shape of the nanostructure of HPCS was spherical with the average particle size of about 660 nm (Figure S1).…”

“…where j stood for current density, j K represented the kinetic current density, j L denoted diffusion-limiting current density, ω was on behalf of the angular velocity, F was for Faraday constant (96485 C mol À 1 ), C o was the concentration of O 2 in 0.1 M KOH electrolyte (1.2 × 10 À 6 mol cm À 3 ), D o signified the diffusion coefficient for O 2 in 0.1 M KOH electrolyte (1.9 × 10 À 5 cm 2 s À 1 ), ν depicted the kinematic viscosity for 0.1 M KOH (0.01 cm 2 s À 1 ). [31,61]…”

N‐doped Mesoporous Carbon Loaded Co Nanoparticles as Highly Effective Non‐noble Metal Electrocatalysts Towards Oxygen Reduction Reaction in Alkaline Solution

“…Figure 2b showed the Raman spectra of NC and Co/NC samples. There were two obvious absorption peaks located at 1359 cm −1 and 1590 cm −1 , which were the defect band (D peak) and the graphite band (G peak) of carbon, representing the degree of defect and graphitization of carbon in the material, respectively [48–50] . The I D /I G (ratio of D peak to G peak intensity) of NC and Co/NC catalysts were 0.94 and 1.03, respectively, which indicated that the addition of Co increased the defect degree of carbon, which was beneficial to enhance the electrocatalytic activity of the catalysts [51] .…”

Boosting ORR Activity via Bidirectional Regulation of the Electronic Structure by Coupling MnO/Mn3O4 Composite Materials with N-Doped Carbon

“…However, simple mechanical mixing leads to limited interactions between the manganese oxides and carbon materials, which leaves a portion of the oxide electrochemically inactive. Direct synthesis or coating of manganese oxides on Ketjenblack carbon, carbon nanotubes, N-doped mesoporous carbon, and N-doped graphene has been reported to be efficient electrocatalysts for ORR. Although many reports have confirmed the positive effects of NC composition strategy in performance promotion, however, the role of carbon materials in these hybrid materials has only been regarded as the conductive network. − The effect of oxide–carbon coupling on the electronic structure and ORR performance of catalysts is still unclear, which has significance for guiding the design of catalytical materials.…”