Strongly coupled C@MoSe2@OMWCNT heterostructure as an anode for Na+ batteries

Abstract

Abstract Herein, based on oxidized multiwall carbon nanotubes (OMWCNTs), C@MoSe2@OMWCNT materials were successfully synthesized. Theoretically, the electron transfer intensity between the interfaces of GR@MoSe2@OSWCNT (oxidized single wall carbon nanotube) is significantly higher than that of C@MoSe2@SWCNT, which means that the interaction between the interfaces of C@MoSe2@OSWCNT is obviously stronger than that of C@MoSe2@SWCNT, improving the structural stability as anode materials for sodium ion batteries (SIBs). In addition, recombination can effectively reduce the Na+ diffusion barrier between MoSe2 layers in the composite (from 0.91 eV to 0.41 eV), promote the Na+ ion mobility of MoSe2 in the composite, and thus improve the rate performance of the SIB. Experimentally, when C@MoSe2@OMWCNT is used as the anode for the SIB, it shows good cycle stability (303 mA h g-1 and 189 mA h g-1 after 500 and 3000 cycles, respectively, under a current density of 5 A g-1).