High‐Performance Supercapacitor Electrode Materials of Mo_1‐xCo_xS₂ Nanoparticles Prepared by Hydrothermal Method

Abstract

Co-doped Mo 1-x Co x S 2 (x = 0, 0.1, 0.3, 0.5) nanoparticles with varying amounts of Co were compounded by hydrothermal channel. The microstructures of the samples were characterized. All the samples showed hexagonal structure, good crystallization, flower shape microspheres and agglomeration to a certain extent. Furthermore, the influence of Co doping on the electrochemical properties was evaluated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), cycle stability and electrochemical impedance spectra (EIS). CV curves present quasi-triangular shapes with good symmetry, doped Mo 1-x Co x S 2 nanoparticles exhibit better specific capacitance and excellent cyclic stability than that of MoS 2 samples. The capacity ratios of MCS-3 electrodes maintains 96 % of its premier capacitance after 3000 cycles. The remarkable electrochemical properties embodied in CV proof were proved via the GCD measurements. Nyquist spectra of doped Mo 1-x Co x S 2 electrodes reveal lower resistance and perfect conductivity. This work reveals that Co doping can further effectively the electrochemical properties of MoS 2 nanomaterials.

Heteroatom-Doped Molybdenum Disulfide Nanomaterials for Gas Sensors, Alkali Metal-Ion Batteries and Supercapacitors

“…When designing an electrode material, the optimal ratio of Mo to heteroatom is often determined, and Table 6 provides data the best achieved cases. The optimal content of Ni or Co in the MoS 2 is 6-7 at% [231,232,247]. A comparative study of MoS 2 nanomaterials doped with Ni, Fe, or Cu in a 6 M KOH electrolyte revealed the pseudocapacitive behavior of the Fe-doped electrode and predominance of electric double-layer capacitance for electrodes doped with Cu and Ni [244].…”