One-step solvothermal synthesis of mixed nickel–cobalt sulfides as high-performance supercapacitor electrode materials

Asymmetric polyhedron structured NiSe2@MoSe2 device for use as a supercapacitor

“… 13 In particular, metal selenide shows superior electrochemical properties with regards to the material architecture, by enhancing the large surface area enabling and accelerating the redox reaction. 14 Furthermore, Se belongs to the same group as the O element and shares similar physical and chemical properties. 15,16 The material Se has good metallic features; therefore, the corresponding transition metal composites exhibit a good electronic conductivity compared to the transition metal oxides (TMOs) which is vital for electrochemical applications.…”

In situ hydrothermal synthesis of nickel cobalt sulfide nanoparticles embedded on nitrogen and sulfur dual doped graphene for a high performance supercapacitor electrode

“…The two obvious redox regions are observed at between 0.1 to 0.3 V for oxidation and between 0.04 to 0.14 V for reduction, resulting from the reversible oxidation–reduction of metal-sulfur-hydroxide in KOH during given voltage potential (seen eqn (4) ). 19,48 M–S + OH − ⇌ M–S–OH + e − (M represents Ni or Co) …”

“…4,5 Recently, extensive materials have been explored as high-performance materials for PC such as conductive polymers (polyaniline, 6,7 polypyrrole 8,9 and poly(2,3-dihydrothieno-1,4dioxin) or PEDOT 10 ) and transition metals (ZnO, [11][12][13][14] Ni(OH) 2 , 15 V 2 O 5 , 16 TiO 2 , 17 MnO 2 , 18 NiS 2 and CoS 2 (ref. 19)). In particular, nickel and cobalt sulde have been chosen as the electrode material because of their rich electroactive sites, multiple redox reaction, and high theoretical capacitances.…”

“…In particular, nickel and cobalt sulde have been chosen as the electrode material because of their rich electroactive sites, multiple redox reaction, and high theoretical capacitances. [19][20][21] Many attempts have been made to develop the high pseudocapacitance materials with nanostructure. The laser irradiation technique was employed to synthesize nickel sulde nanostructures, demonstrating the ultra-high specic capacitance of 3761 F g À1 at 10 mV s À1 .…”

One‐step synthesis of hierarchical structured nickel copper sulfide nanorods with improved electrochemical supercapacitor properties

“…In particular, the well dispersibility and surface structure of NiS 2 resulted in the enhanced performance. Nguyen et al 42 fabricated the Ni‐Co based sulfides using a solvothermal route and investigated the effect of composition on the supercapacitive performance. As a result, the 3:1 M ratio of Ni:Co exhibited a high SC of 1345 F/g at 2 A/g.…”