NiCo2S4/NieCo layered double hydroxide nanocomposite prepared by a vapor-phase hydrothermal method for electrochemical capacitor application

摘要

In this work, NiCo2S4/NieCo layered double hydroxide (LDH) nanocomposites were prepared by using Ni-Co LDH nanosheets as precursor through a vapor-phase hydrothermal method. The NiCo2S4/NieCo LDH nanocomposites have a hierarchical structure in which interconnected NiCo2S4 nanosheets with smaller sizes are loaded on NieCo LDH nanosheets. Electrochemical performances of the NiCo2S4/NieCo LDH nanocomposites were measured by cyclic voltammetry and galvanostatic chargeedischarge techniques. The NiCo2S4/NieCo LDH electrode achieved a capacity of 1765 F g(-1) at 1 A g(-1) and a capacity of 940 F g(-1) at 10 A g(-1). Control experiments showed that the capacities of the NiCo2S4/NieCo LDH are higher than NieCo LDH and NiCo2S4 nanosheets. The better electrochemical performances of the NiCo2S4/NieCo LDH electrode can be attributed to the unique hierarchical structure which was formed during the vapor-phase hydrothermal process. (C) 2017 Elsevier B.V. All rights reserved.