Binder-free novel Cu4SnS4 electrode for high-performance supercapacitors

Electrodeposited Copper Tin Sulfide/Reduced Graphene Oxide Nanospikes for a High-Performance Supercapacitor Electrode

Copper tin sulfide, Cu4SnS4 (CTS), a ternary transition-metal chalcogenide with unique properties, including superior electrical conductivity, distinct crystal structure, and high theoretical capacity, is a potential candidate for supercapacitor (SC) electrode materials. However, there are few studies reporting the application of Cu4SnS4 or its composites as electrode materials for SCs. The reported performance of the Cu4SnS4 electrode is insufficient regarding cycle stability, rate capability, and specific capacity; probably resulting from poor electrical conductivity, restacking, and agglomeration of the active material during continued charge-discharge cycles. Such limitations can be overcome by incorporating graphene as a support material and employing a binder-free, facile, electrodeposition technique. This work reports the fabrication of a copper tin sulfide-reduced graphene oxide/nickel foam composite electrode (CTS-rGO/NF) through stepwise, facile electrodeposition of rGO and CTS on a NF substrate. Electrochemical evaluations confirmed the enhanced supercapacitive performance of the CTS-rGO/NF electrode compared to that of CTS/NF. A remarkably improved specific capacitance of 820.83 F g-1 was achieved for the CTS-rGO/NF composite electrode at a current density of 5 mA cm-2, which is higher than that of CTS/NF (516.67 F g-1). The CTS-rGO/NF composite electrode also exhibited a high-rate capability of 73.1% for galvanostatic charge-discharge (GCD) current densities, ranging from 5 to 12 mA cm-2, and improved cycling stability with over a 92% capacitance retention after 1000 continuous GCD cycles; demonstrating its excellent performance as an electrode material for energy storage applications, encompassing SCs. The enhanced performance of the CTS-rGO/NF electrode could be attributed to the synergetic effect of the enhanced conductivity and surface area introduced by the inclusion of rGO in the composite.

Binary mixed molybdenum cobalt sulfide nanosheets decorated on rGO as a high-performance supercapacitor electrode

This work represents the production of MoS₂/CoS₂ hybridized with rGO as a material for high-performance supercapacitors. The hydrothermal method is used for the synthesis. The as-prepared material is characterized by x-ray diffraction spectroscopy, x-ray photoelectron spectroscopy, and electron microscopy. The size of the nanoparticles is estimated at 80 nm, and their uniform dispersion on rGO is observed from electron microscopy images. A high-specific capacitance of 190 mF cm^-2 obtains for MoS₂/CoS₂/rGO at the current density of 0.5 mA cm^-2 in 2 M KOH. The cyclic stability over 5000 cycles at a scan rate of 100 mV s^-1 shows that the MoS₂/CoS₂/rGO electrode is stable, and 88.6% of its initial capacitance sustains at the end of 5000 cycles. This excellent performance is assigned to the synergistic effect of rGO and MoS₂/CoS₂. This electrode with excellent stability and capacitance could be a potential candidate for supercapacitor electrode materials.

Simple one-pot synthesis of Cu4SnS4 nanoplates and temperature-induced phase transformation mechanism

A simple one-pot heat-up method has been developed to synthesize Cu₄SnS₄ nanoplates with highly exposed (002) surfaces.

Nanosheets of nickel, cobalt and manganese triple hydroxides/oxyhydroxides as efficient electrode materials for asymmetrical supercapacitors

An in situ method to fabricate thin nanosheets of Nickel, Cobalt and Manganese composite for charge storage applications is reported.

Controlling the formation of self-assembled Cu–Sn sulfide with a hoya-like structure for its electrochemical performance

Self-assembled hoya-like micron-spheres (Cu–Sn–S) with honeycomb pores were fabricated via a facile gelation–solvothermal–annealing three-step method and exhibited enhanced electrochemical performance for supercapacitors and HER.