Synergistically enhanced sodium ion storage from encapsulating highly dispersed cobalt nanodots into N, P, S tri-doped hexapod carbon framework

Shimei Wu; Feng Xu; Yining Li; Chilin Liu; Yufei Zhang; Haosen Fan

doi:10.1016/j.jcis.2023.06.159

Synergistically enhanced sodium ion storage from encapsulating highly dispersed cobalt nanodots into N, P, S tri-doped hexapod carbon framework

J Colloid Interface Sci. 2023 Nov:649:741-749. doi: 10.1016/j.jcis.2023.06.159. Epub 2023 Jun 25.

Authors

Shimei Wu¹, Feng Xu¹, Yining Li¹, Chilin Liu¹, Yufei Zhang², Haosen Fan³

Affiliations

¹ School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China.
² School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China. Electronic address: yfzhang@gdut.edu.cn.
³ School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China. Electronic address: hsfan@gzhu.edu.cn.

PMID: 37385039
DOI: 10.1016/j.jcis.2023.06.159

Abstract

Development of multitudinous heteroatoms co-doped carbon nanomaterials with pleasurable electrochemical behavior for sodium ion batteries is still an enormous challenge. Herein, high dispersion cobalt nanodots encapsulating into N, P, S tri-doped hexapod carbon (H-Co@NPSC) have been victoriously synthesized via H-ZIF67@polymer template strategy with using poly (hexachlorocyclophos-phazene and 4,4'-sulfonyldiphenol) as both carbon source and N, P, S multiple heteroatom doping sources. The uniform distribution of cobalt nanodots and the Co-N bonds are conducive to form a high conductive network, which synergistically increase a lot adsorption sites and lessens the diffusion energy barrier, thereby improving the fast Na⁺ ions diffusion kinetics. Consequently, H-Co@NPSC delivers the reversible capacity of 311.1 mAh g^-1 at 1 A g^-1 after 450 cycles with 70% capacity storage rate, while obtains the capacity of 237.1 mAh g^{- 1} after 200 cycles at the elevated current densities of 5 A g^-1 as an excellent anode material for SIBs. These interesting results pave a generous avenue for the exploitation of promising carbon anode materials for Na⁺ storage.

Keywords: Co-N bonds; Hexapod-shaped; N, P, S tri-doped carbon; Sodium ion batteries; ZIF-67.