FeP nanoparticles highly dispersed on N,P-doped petaloid carbon nanosheet: Interface engineering and boosted intrinsic ORR activity

Insights into the synergistic catalytic mechanism on the customized dual sites of an efficient ORR catalyst

“…In addition, the D′′ band is associated with a distortion of the symmetry within aromatic rings, which can be attributed to the doping of heteroatoms in the graphene-like structure. 22,23 The higher intensity value of D′′ in PtCo/PC-2 confirms the presence of P heteroatoms in the carbon carrier, thus supporting the presence of P–C sites.…”

NH3 plasma-etching-derived porous N-doped carbon nanotubes with FeP nanoparticles and intrinsic carbon defects for boosting oxygen reduction in rechargeable Zn–air batteries

“…51,52 It is noted that by NH 3 plasma etching on the FeP/NPCNT sample, the diffraction peaks of Fe 2 P became weaker and even almost vanished, whilst the diffraction peaks of FeP became stronger, implying the phase conversion of Fe 2 P to FeP nanoparticles with increased crystallinity, which have been proved as good ORR electrocatalyst. [42][43][44]48 However, immoderate plasma etching for 45 min could generate excess defects and severely damage both FeP nanoparticles and CNTs, resulting in the intensity shrinkage of their diffraction peaks. It can be observed that the characteristic peak positions of FeP in CV-FeP/NPCNT-t did not show an obvious shift as compared with FeP/NPCNT, indicating again that ammonia plasma etching did not cause detectable nitrogen element doping into iron phosphide.…”

“…3b) at approximately 402.4, 401.7, 400.4, 399.2 and 398.5 eV are ascribed to oxidized N, graphitic N, pyrrolic N, Fe-N and pyridinic N, respectively. 44,48 The contents of these different N bonding structures were fitted from the high-resolution N 1s XPS spectra (Fig. 3b) as shown in Table S2.…”

“…For instance, Shan et al confirmed that the ORR performance of the three-dimensional petaloid carbon nanosheets can be dramatically improved by supporting FeP nanoparticles. 48 Furthermore, we believe that the ORR performance could be affected by the existing forms of Fe x P nanoparticles, including onefold FeP, Fe 2 P, and their mixture. It is necessary to perform phase engineering of Fe x P nanoparticles for better ORR performance.…”

“…40,41 In order to prevent the agglomeration of Fe x P nanoparticles and improve electrical conductivity, Fe x P nanoparticles are usually supported on carbon nanostructures to realize synergistic interaction with further boosted ORR performance. [42][43][44][45][46][47][48] These Fe x P nanoparticles modulate the electron distribution across the carbon matrix, and rendering moderate adsorption/desorption capability to the reactant/intermediate/product, along with easier activation and breakage of the O-O bond. For instance, Shan et al confirmed that the ORR performance of the three-dimensional petaloid carbon nanosheets can be dramatically improved by supporting FeP nanoparticles.…”