In-situ self-templated preparation of porous core–shell Fe1−S@N, S co-doped carbon architecture for highly efficient oxygen reduction reaction

Realizing Ultrafast and Robust Sodium-Ion Storage of Iron Sulfide Enabled by Heteroatomic Doping and Regulable Interface Engineering

“…Based on previous reports, this may be caused by N doping, which can induce electronic modulation, and S 2− may be replaced by N 3− ions to form Fe-N during the reaction [25]. The Raman spectra of the samples (Figure 2b) display two peaks of carbon at 1360 cm −1 and 1590 cm −1 , which are ascribed to the disordered carbon (D-band) and graphitic carbon (G-band) [26,27], respectively. The peak intensity ratio (I D /I G ) of PPF-800 (0.95) is lower than that of PF-800 (1.04), suggesting a higher degree of graphitization in PPF-800, which is beneficial for improving electrical conductivity [28,29].…”

High reaction activity enables carbon dots to construct multicomponent nanocomposites with superior catalytic performance

“…In addition, the incompletely reduced species of SO x n− was also observed at the binding energy of 167.7 eV. 30,32 The XPS N 1s spectrum reveals four different types of N (Fig. 1f ): pyridinic N (397.8 eV), Fe-N x (399 eV), pyrrolic N (400.25 eV), and graphitic N (402.1 eV), in which the presence of Fe-N x species confirms the chemical bonding of Fe and N atoms.…”

“…1d), the peaks at 706.5 eV belong to Fe 0 , and the four binding energies at 710.2, 713.5, 723.8, and 727.2 eV correspond to Fe(II) 2p 3/2 , Fe(III) 2p 3/ 2 , Fe(II) 2p 1/2 , and Fe(III) 2p 1/2 , respectively. 30,31 The XPS S 2p spectrum can be deconvoluted into four peaks (Fig. 1e), which denote Fe-S bonds (160.7 and 161.9 eV) and C-S-C bonds (163.2 and 164.7 eV).…”

Zinc-motivated Fe/Fe5C2/Fe1−xS@Fe–N–C active sites grown on N-doped porous carbon toward efficient oxygen reduction reaction in zinc-air batteries

“…21 For instance, Lou et al showed that a graphene layer-wrapped Fe/Fe 5 C 2 compound on N-doped graphene nanosheets exhibited a high ORR performance, surpassing that of commercial Pt/C; 22 He et al prepared an Fe/Fe 5 C 2 species wrapped in N-doped carbon catalyst for the ORR with a half-wave potential ( E 1/2 ) of 0.85 V; 23 and Chen et al reported the preparation of core–shell Fe 1− x S@N, S co-doped porous carbon for the ORR by employing Fe 3 O 4 nanospheres and pyrrole as the precursor with catalytic activity comparable to that of commercial Pt/C. 24 However, although the introduction of single carbides or sulfides in Fe–N–C catalysts has been widely investigated and shown enhanced ORR activity, to date, the simultaneous coupling of Fe/Fe 5 C 2 species and Fe 1− x S species in N-doped carbon has been rarely reported. Moreover, when the precursor is pyrolyzed at high temperature, the transition metal particles often suffer from agglomeration or sintering.…”