Fe, N-doped graphene-wrapped carbon black nanoparticles as highly efficient catalyst towards oxygen reduction reaction

Double-Activator Modulation of Ultrahigh Surface Areas on Doped Carbon Catalysts Boosts the Primary Zn–Air Battery Performance

“…Compared with doped carbon catalysts synthesized at other temperatures, A-NFCF-950 obtained at 950 °C exhibits a higher half-wave potential and ultimate current density, indicating that temperature can promote more active sites, but a very high temperature will decompose the active sites, so the results show that the highest ORR performance is achieved by treatment at 950 °C. The electrical conductivity of the four catalysts was determined by electrochemical impedance spectroscopy (EIS) tests . The inset shows the corresponding equivalent circuit diagram in Figure d, where R s denotes the solution resistance between the working and reference electrodes, R f means the feedback resistance, Q represents the constant-phase element, C dl shows the double-layer capacitance in the interface, and R ct symbolizes the charge transfer resistance in the ORR process. , As we expected, the charge transfer resistance ( R ct ) of A-NFCF-950 (48.2 Ω cm 2 ) is much lower than those of CF-950 (74.6 Ω cm 2 ), A-CF-950 (71.0 Ω cm 2 ), and NFCF-950 (58.1 Ω cm 2 ), which is also consistent with the previous electrochemical analysis.…”

“…The electrical conductivity of the four catalysts was determined by electrochemical impedance spectroscopy (EIS) tests. 52 The inset shows the corresponding equivalent circuit diagram in Figure 4d, where R s denotes the solution resistance between the working and reference electrodes, R f means the feedback resistance, Q represents the constant-phase element, C dl shows the doublelayer capacitance in the interface, and R ct symbolizes the charge transfer resistance in the ORR process. 53,54 As we expected, the charge transfer resistance (R ct ) of A-NFCF-950 (48.2 Ω cm 2 ) is much lower than those of CF-950 (74.6 Ω cm 2 ), A-CF-950 (71.0 Ω cm 2 ), and NFCF-950 (58.1 Ω cm 2 ), which is also consistent with the previous electrochemical analysis.…”

Multi-Heteroatom Doped Fe@CN Activation Peroxomonosulfate for the Removal of Trace Organic Contaminants from Water: Optimizing Fabrication and Performance

“…The kobs value for DIC removal increased from 0.0044 min −1 to 0.0207 min −1 , while that for ATL removal rose from 0.0059 min −1 to 0.0435 min −1 with the PMS dosage increasing from 0.65 Doping heteroatoms is an effective method to provide additional defects and active sites in a PMS activator [16]. The characteristic Raman peaks of the graphene carbon material appear in the sample at 1330 cm −1 and 1585 cm −1 , where the peak at 1330 cm −1 corresponds to the sp 3 hybridization of the disordered structure and is named the D peak, and the peak at 1585 cm −1 corresponds to the sp 2 hybridization of the ordered structure and is named the G peak [48]. The ratio of intensity of D and G peaks (I D :I G ) is used to indicate the degree of defects in the carbon material, with a larger ratio indicating a greater degree of defects in the carbon.…”

Manipulating the interaction of Pt NPs with N-hollow carbon spheres by F-doping for boosting oxygen reduction/methanol oxidation reactions

“…31 On this basis, the researchers tried to dope the carbon substrate with heteroatoms, particularly N atoms. Since the electronegativity of the N atom ( χ = 3.0) is greater than that of the C atom ( χ = 2.5), 32 when N atoms are doped into the carbon skeleton, this will attract the lone electrons around the neighboring C atoms, leading to the C atoms remaining in the deficient-electron state. 33,34 Therefore, when bonded with Pt NPs loaded on the surface, the strong interaction between the two phases will cause the C atoms to attract electrons around the Pt atoms by a large amount to lead to the d-π conjugation, which will result in the d band center of Pt atoms moving forward, and then partially transforming Pt 0 into Pt x + .…”