Heteroatomic Interface Engineering of MOF-Derived Metal-Embedded P- and N-Codoped Zn Node Porous Polyhedral Carbon with Enhanced Sodium-Ion Storage

Abstract

Amorphous-ordered mesoporous carbon materials are regarded as the most promising anode candidate for sodium-ion batteries (SIBs) owing to their ecofriendliness, abundance, thermal stability, and low price. However, poor rate, low initial Coulombic efficiency, and poor cycling performance have been the major challenges of SIBs. Herein, we successfully constructed robust phosphorus and nitrogen-codoped Zn node porous polyhedral carbon polyhedron (P-N-Zn-C). The as-prepared P-N-Zn-C anode delivers outstanding electrochemical performance and ultrahigh stability and has achieved a remarkable capacity of 460 mA h g -1 at 100 mA g -1 , long-term cycling stability of up to 100 cycles, and an excellent rate performance even at a current density of up to 1000 mA g -1 . The remarkable performance can be ascribed to the enlarged interlayer distances of carbon and the existence of Zn node, which facilitate the insertion-extraction of Na ions. The first-principle density functional theory calculations revealed that the presence of P, N, and Zn could reduce the band gaps between the valence and conduction bands and accelerate the electron transfer reaction rate. This study underscores the potential importance of heteroatom doping as an effective strategy for improving the performance of carbon electrode materials.

Controlled Selenium Infiltration of Cobalt Phosphide Nanostructure Arrays from a Two-Dimensional Cobalt Metal–Organic Framework: A Self-Supported Electrode for Flexible Quasi-Solid-State Asymmetric Supercapacitors

“…This noticeable increase in the R ct value after the stability test indicates that the charge transfer kinetics decelerated as the charge−discharge cycles increased. 11,30,69 W is the Warburg resistance associated to ion diffusion/ transport in the electrolyte, and C dl and C f are the electrical double-layer capacitance and pseudocapacitance, respectively. The inset of Figure 7e shows the high-frequency region of the Nyquist plot before and after the cycling stability test.…”

“…The charge transfer resistance ( R ct ) caused by the double layer and Faradaic reactions at the interface between the electrode and electrolyte was 2.83 Ω before the stability test and 3.64 Ω after the stability test. This noticeable increase in the R ct value after the stability test indicates that the charge transfer kinetics decelerated as the charge–discharge cycles increased. ,, W is the Warburg resistance associated to ion diffusion/transport in the electrolyte, and C dl and C f are the electrical double-layer capacitance and pseudocapacitance, respectively. The inset of Figure e shows the high-frequency region of the Nyquist plot before and after the cycling stability test.…”

Metal organic framework-based nanostructure materials: applications for non-lithium ion battery electrodes

“…9j). 136 Notably, when P–N–Zn–C was employed as an anode for SIBs, a remarkable capacity of 460 mA h g −1 at 100 mA g −1 , long-term cycling stability of up to 100 cycles, and an excellent rate performance even at a current density of up to 1000 mA g −1 (Fig. 9k) was observed, confirming the outstanding electrochemical performance and ultrahigh stability for this composite electrode material.…”

Boosting the transport kinetics of free-standing SnS2@Carbon nanofibers by electronic structure modulation for advanced lithium storage

“…S25 †). 72,73 The diffusion coefficient of Mg-SnS 2 /CNFs is about two times higher than that of SnS 2 / CNFs during the charge-discharge process, which is benecial for improving the high-rate performance. 73 The pristine discharge-charge curves are displayed in Fig.…”