Hollow nanotube arrays of nickle-cobalt metal sulfide for high energy density supercapacitors.

ABSTRACT: High energy density is still difficult to achieve using existing metal sulfides because of their low specific capacitance. To improve capacitance, a series of nickel and cobalt metal sulfides with different Ni/Co ratios were synthesized by a two-step hydrothermal method. Using the combining method of experimental research and first-principles calculation, the morphology, structural stability, electronic structure and electrochemical properties of metal sulfides were investigated systematically. The results show that the morphology of metal sulfides gradually grows from two-dimensional structure to nanotube arrays, and finally to nanorod arrays, as the Ni/Co ratios decrease. Among them, the NC24 sample with the Ni/Co ratio of 1 : 2 is a hollow nanotube array composed of NiCo₂S

SUBMITTER: Shen D 

PROVIDER: S-EPMC9926465 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature