Yolk-Shell Polystyrene@Microporous Organic Network: A Smart Template with Thermally Disassemblable Yolk To Engineer Hollow MoS₂/C Composites for High-Performance Supercapacitors.

ABSTRACT: Yolk-shell-type polystyrene@microporous organic network (Y-PS@MON) materials were prepared by the Sonogashira coupling of tetra(4-ethynylphenyl)methane and 1,4-diiodobenzene on the surface of PS@SiO₂ and by the etching of SiO₂. The diameter of PS yolk spheres and the thickness of MON shells were 150 and ?10 nm, respectively. The thickness of the void space between the PS yolk and the MON shell was ?30 nm. Y-PS@MONs were used as templates for the synthesis of MoS₂/C composite materials. Because of the microporosity of the MON shells and the void space between the yolk and the shell, MoS₂ precursor compounds were efficiently incorporated into Y-PS@MONs. The heat treatment under argon resulted in the formation of hollow MoS₂/C composites. The contents of MoS₂ in the composites were systematically controlled by changing the amounts of precursor. MoS₂/C with 58 wt % of MoS₂ showed the best energy storage performance with a capacitance of 418 F/g at a 0.5 A/g current density as an electrode material of a coin cell supercapacitor, which is attributable to its hollow structure, high surface area, and the good distribution of the sliced MoS₂ in the carbon matrix. Also, the MoS₂/C-58 composite showed excellent retention of capacitances during 5000 cycles.

SUBMITTER: Lee H 

PROVIDER: S-EPMC6645370 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature