Stable GO-NiCoS-NiMoLDH composite material and preparation method and application thereof

Abstract

The invention discloses a GO (graphene oxide)-NiCoS (NiMoLDH) composite material. The GO-NiCoS-NiMoLDH composite material is prepared from GO (graphene oxide), flaky NiCo2S4 and nano flower-shaped NiMoLDH, wherein GO is a base material, the microstructure is of a nanosheet structure, and the GO is used as a conductive substrate to facilitate ultrahigh-speed transportation of electrons; the microstructure of NiCo2S4 is a nanosheet structure, and NiCo2S4 is loaded on the surface of GO and is used for providing extra pseudocapacitance; the microstructure of the NiMoLDH is a nanosheet structure, and the NiMoLDH is embedded in the surface of the NiCo2S4 nanosheet structure and has the effect of increasing the specific surface area of NiCo2S4; the preparation method is a two-step hydrothermal method and comprises the following steps: step 1, preparing GO-NiCo2S4; and step 2, the preparation of GO-NiCoS-NiMoLDH is carried out. When the material is used as a supercapacitor electrode material, the material is charged and discharged in a range of 0-0.5 V, and when the discharge current density is 1A g <-1 >, the specific capacitance is 1300-1400 F g <-1 >; and when the discharge current density is 20A g <-1 >, the cycling stability after 3000 cycles is 100%. The method has the following advantages: the layered structure of the nanoflower formed by the nanosheets is formed, so that the aggregation of the nanosheets is avoided; and a synergistic effect also exists between the NiCo2S4 and the NiMoLDH.

Description

technical field [0001] The invention relates to a preparation technology of graphene oxide as a matrix material and a metal sulfide, in particular to a carbon-based supercapacitor (SCs) composite material with stable structure and a preparation method and application thereof. Background technique [0002] In recent years, supercapacitors (SCs), as an emerging energy storage device, have attracted extensive attention due to their high power density, fast charge and discharge speed, wide operating temperature range, and long cycle life, making them the most suitable energy storage and One of the conversion devices. The electrochemical performance of supercapacitors has been determined by electrode materials and has become the focus of research. As one of the key components of SCs, electrode materials play an important role in improving their electrochemical performance. To meet the demands of ever-increasing energy / power densities, tremendous efforts have been devoted to fin...

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Problems solved by technology

[0011] Prior art shows that NiCo 2 S 4 As an electrode material for supercapacitors has application prospects, however, NiCo 2 S 4 Further applications in supercapacitor electrode materials are limited by their small surface area, chemical instability, and weak mechanical properties, and are easily damaged by redox reactions during long-term charge and discharge, resulting in poor rate performance and cycle stability. Therefore, effective methods must be developed to overcome these disadvantages

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