Na‐Doped C₇₀ Fullerene/N‐Doped Graphene/Fe‐Based Quantum Dot Nanocomposites for Sodium‐Ion Batteries with Ultrahigh Coulombic Efficiency

Abstract

Na-doped C 70 fullerene (Na-C 70 )/N-doped graphene (N-GN)/Febased nanocomposites (Na-C 70 /N-GN/FBNCs) with the multiple morphologies are fabricated through an in situ one-step method with multifunction sodium lignosulfonate (SLS) as the structural template and the main raw material. Fe-based quantum dots (FBQDs) can be embeded in the ordered mesoporous hybrid carbon structure of Na-C 70 and N-GN through a spontaneous chelation reaction of SLS with iron ions and carbonization under relatively mild hydrothermal treatment. We investigate the influences of the molar ratio of SLS/Fe on the structure, components, and electrochemical properties of the nanocomposites. Its unique hybrid carbon structure offers metallicity and superconductivity, countless bonding sites of Na ions, and facilitates the transfer of electrons and Na ions during prolonged cycling. The nanocomposites for sodium-ion batteries anodes can achieve the highest discharge capacities of 1898 mAh g À1 at a current density of 1000 mA g À1 , and can retain a reversible capacity of 238 mAh g À1 after 100 cycles, which are significantly better than those of lithium-ion batteries. The discharge and charge capacities at 1 A g À1 after 30th cycles are 356 and 119 mAh g À1 , respectively, with an ultrahigh coulombic efficiency of 299 % and the highest coulombic efficiency of 463 % after 220 cycles.

Self‐Assembled Fullerene Nanostructures: Synthesis and Applications

“…One such example of the experimental demonstration was the encapsulation of fullerenes in the pores of porous graphene that exhibited good optoelectronic properties. [170] A single step porous N-doped graphene and fullerene hybrid nanostructure was synthesized by Wang et al [171] The singlestep process anchors Fe-based quantum dots on the hybrid porous carbon forming a Na-C 70 /N-GN/FBNCs hybrid resulting in synergetic capacitance in sodium-ion batteries when used Figure 13. A) Lithiation reaction to adhere fullerene to graphene through monosubstitution reaction.…”

Enhanced Methanol Oxidation in Acid Media on Pt/S, P Co‐doped Graphene with 3D Porous Network Structure Engineering

“…D peak at 1341 cm −1 and G peak at 1593 cm −1 can be observed in all the samples in Figure . It is well acknowledged that D and G peak are individually related to the disorder vibration of carbon materials and E 2g phonon of the ordered sp 2 bonded carbon atoms ,. Hence, according to the ratio between I D and I G the defect degree of carbon materials can be known.…”

Fullerenes for rechargeable battery applications: Recent developments and future perspectives

“…Their group also found [82] that the mixture of C 60 /C 70 as a SIB anode improved the reversibility of Na + storage, and the initial discharge capacity went up to 320 mAh g À1 . In addition, He et al [83] prepared Na-doped C 70 fullerene (Na-C 70 )/N-doped graphene (N-GN)/Fe-based nanocomposites (Na-C 70 /N-GN/FBNCs) as SIB anode materials, which achieved the highest discharge capacity, up to 1898 mAh g À1 and retained a reversible capacity of 238 mAh g À1 after 100 cycles at a current density of 1 A g À1 (Fig. 6b).…”