Direct pyrolysis of melamine sponge toward nitrogen-doped carbon for high-performance lithium and sodium ion storage

Sb2O3 nanoparticles anchored on N-doped graphene nanoribbons as improved anode for sodium-ion batteries

“…3b) can be deconvoluted as C-C, C]C, C-O and C-N bonds centered at 284.5, 285.3, 286.7 and 288.6 eV, respectively. 34,35 Moreover, the three tted peaks at 400.9, 399.8 and 398.6 eV in the N 1s spectrum (Fig. 3c) correspond to the graphitic, pyrrolic and pyridinic N, respectively, conrming Ndoped GNR aer melamine treatment.…”

“…33,34 The additional peak at 531.8 eV is associated to O 1s core-level by Sb-O-C bond, which suggests the close interaction between Sb 2 O 3 nanoparticles and N-GNR. 35 The C 1s spectrum (Fig. 3b) can be deconvoluted as C-C, C]C, C-O and C-N bonds centered at 284.5, 285.3, 286.7 and 288.6 eV, respectively.…”

“…It is worth noting that the presence of graphitic and pyridinic N species into the nanocomposite has been reported to improve its electronic conductivity, since they are active sites for Li + /Na + insertion. 26,35,36 Sodium storage performance of the N-doped and control nanocomposite was evaluated by different electrochemical techniques aer assembling sodium coin half-cells. Fig.…”

“…This result is in agreement with previous studies using various carbon nanostructures doped with N as electrode. 20,25,35 On the other hand, aer continuous charge/ discharge cycling, the high frequency semicircle is affected not only by the contribution of R ct , but also for the oxide conversion into an alloy and SEI layer. It explains the signicant reduction of the semicircle compared to that before cycling.…”

Screening Heteroatom Configurations for Reversible Sloping Capacity Promises High‐Power Na‐Ion Batteries

“…The measurements were performed under vacuum to diminish the influence of the adsorbed oxygen molecules with the dangling bonds [41] . As shown in Figure 3i and Figure S14, the EPR signals of the P/O‐doped carbons present a pair of narrow sharp peaks with small peak‐to‐peak line width (Δ H pp ) and a pair of broader peaks with larger Δ H pp , which correspond to the dangling bonds or terminated free radicals from the lone‐pair electrons and the free charge carriers, respectively [41, 52–54] . In contrast, the SC shows significantly weaker EPR signals, indicating limited free radicals.…”