首页|Facile construction of N-doped porous carbon nanosheets derived from melamine cyanurate/xylitol for advanced sodium-ion batteries
Facile construction of N-doped porous carbon nanosheets derived from melamine cyanurate/xylitol for advanced sodium-ion batteries
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NSTL
Elsevier
? 2022 Elsevier B.V.Herein, the attractive N-doped porous carbon nanosheets (NPCs-4, mass ratio = 4/1) were synthesized by a simple one-step carbonization approach using the mixtures of melamine cyanurate and xylitol (mass ratio = 4/1), which formed the interconnected carbon framework with abundant pore structure. The NPCs-4 electrode displayed a large specific surface area of 703.2 m2/g with hierarchical pore sizes (2–4 nm) and expanded interlayer spacing of ~0.39 nm. The abundant pore structure and N-doping of the NPCs-4 facilitated high Na-ion storage capacity, fast transfer kinetics and stable cycling. As a result of these improvements, the as-prepared NPCs-4 electrode delivered an advanced rate performance (191.1 mA h/g at 20 A/g), and an outstanding ultra-long cycling performance with a specific capacity of 171 mA h/g at 10 A/g after 10,000 cycles (0.0017% loss per cycle), which was the one of the optimal long-cycle properties at high current density reported for carbon-based anode for SIBs to date. Moreover, the kinetic analysis revealed a capacitance-dominated sodium storage mechanism in the NPCs-4 electrode, and possessed a superior Na+ ion diffusion coefficient (1.92 ? 10?12 cm2/s), on account of synergistic interaction of rational nanopore structure and appropriate N-doping in NPCs-4. This work provided a facial route to synthesize controlled N-doping porous carbon nanosheets with enlarged interplanar spacing and high specific area, meeting the various requirements unitized as anodes in rechargeable Na+ ions batteries.
NSTL
Elsevier
