Molybdenum disulfide (MoS₂) after the few-layer (FL) processing draws attention to its attractive characteristics, such as broadening interlayer spacing, increasing active sites, and promoting purity of the metallic phase. Notwithstanding, the poor stability and easy aggregation of FL-MoS₂ limit its potential for development in the field of electrochemistry. Herein, a nanocomposite between FL-MoS₂ and reduced graphene oxide (rGO) is successfully constructed via the one-pot hydrothermal method. Furthermore, the FL-MoS₂@rGO composite with a stable structure is obtained by regulating the amount of rGO. The excellent supercapacitor capacitances of FL-MoS₂ after building heterostructure composites with rGO are displayed, owing to the synergistic effects occurring in heterostructure. The optimal sample of FL-MoS₂@rGO-2 possesses a specific capacitance of 346.1 F g⁻¹ at 1 A g⁻¹ and a rate ability of 57.2%. Moreover, the capacitance of FL-MoS₂@rGO-2 remains 99.1% after 10,000 cyclic charges and discharges. More importantly, the theoretical calculations confirm the source of extra specific capacitance and raise conductivity in FL-MoS₂@rGO. Also, a FL-MoS₂@rGO-2//AC flexible asymmetric supercapacitor device is successfully fabricated, which presents the superior energy density and power density of 84.31 µWh cm⁻² at 700 µW cm⁻², and 51.42 µWh cm⁻² at 3500 µW cm⁻². This work verifies the potential of the heterostructure composite constructed by FL-MoS₂ in energy storage of electrochemical application.

Plasma treatment of molybdenum disulfide (MoS ₂ ) presents several advantages that enhance its performance and broaden its applications.

Bi doped MoS ₂ after plasma treatment exhibits excellent electrochemical properties.

Molybdenum disulfide (MoS₂), a typical layered material, has important applications in various fields, such as optoelectronics, catalysis, electronic devices, sensors, and supercapacitors. Extensive research has been carried out on few-layered MoS₂ in the field of electrochemistry due to its large specific surface area, abundant active sites and short electron transport path. However, the preparation of few-layered MoS₂ is a significant challenge. This work presents a simple one-pot hydrothermal method for synthesizing few-layered MoS₂. Furthermore, it investigates the exfoliation effect of different amounts of sodium borohydride (NaBH₄) as a stripping agent on the layer number of MoS₂. Na⁺ ions, as alkali metal ions, can intercalate between layers to achieve the purpose of exfoliating MoS₂. Additionally, NaBH₄ exhibits reducibility, which can effectively promote the formation of the metallic phase of MoS₂. Few-layered MoS₂, as an electrode for supercapacitor, possesses a wide potential window of 0.9 V, and a high specific capacitance of 150 F g⁻¹ at 1 A g⁻¹. This work provides a facile method to prepare few-layered two-dimensional materials for high electrochemical performance.