Metal-Heteroatom-Doped Cos/Mxene Nanohybrid For Efficient Supercapacitor Electrode Materials

Abstract

Developing electrode active materials with abundant active sites, hierarchical porous structure, and good chemical/structure stability significantly promote energy density and cycling stability. However, it is not easy to realize all features for a single component, various strategies such as hetero-atom doping, hybridizing route, and defect engineering could provide possible approaches. Herein, FeCoS were hybridized with MXene to achieve high stability and superior electrochemical performance electrode materials, the well-designed heterogeneous nanohybrids have several merits for abundant active sites, exceptional structural durability, excellent electrical conductivity own to the strong interfacial connection and favorable synergistic effect between the two phases. Consequently, the optimal hybrid electrode demonstrated superior electrochemical performance with an excellent specific capacity of 1190 C g -1 at a current density of 2 A g−1 and outstanding rate capability for 900 C g -1 at 10 A g-1. Moreover, the metal-doped with various cations of Fe2+, Al2+, Ni2+ and Sn2+ were separately introduced into the structural phase to evaluate the feasibility, and the strategy not only provides the feasible and universal development of the stable interface between the hybrids, but also paved the way for the design of high-capacity electrodes.

Keywords: metal-doped, metal-sulfur compounds, hybrid materials, MXene