Facile fabrication of Ni_0.85Se nanowires by the composite alkali salt method as a novel cathode material for asymmetric supercapacitors

Abstract

The search for Earth-abundant and efficient electrode materials is significant for advanced supercapacitors.

Regulation of the morphology and electrochemical properties of Ni0.85Se via Fe doping for overall water splitting and supercapacitors

“…18–20 It is well known that Se metal presents a larger atomic radius, higher electronic conductivity, stronger metallic property and smaller ionization energy than O and S, suggesting that Se metal shows higher electrochemical activity and faster faradaic reactions than metal oxides and sulfides. 21,22 Moreover, the electronegativity of nickel ( χ = 1.9) is similar to that of selenium ( χ = 2.4). 23 Thus, nickel and selenium can form various nickel selenides with different stoichiometric ratios (NiSe, NiSe 2 , Ni 1− x Se and Ni 3 Se 2 ), 24–26 showing tunable electronic configurations and multiple oxidation states, which is helpful for energy storage.…”

Synthesis of bimetallic nickel cobalt selenide particles for high-performance hybrid supercapacitors

“…[13][14][15][16] The energy gap of selenides is smaller than that of oxides and suldes of the same family, so selenides generally show superior electrochemical properties. Compared with Co or Ni single metal selenides, 17,18 purposely designed binary metal selenide composites are an effective method to optimize electrode performance. For example, the (Ni,Co)Se 2 bimetallic selenidecomposite nanostructure was prepared by Wang et al, as a result, the (Ni,Co)Se 2 /NiCo LDH delivers a high capacity of 170 mA h g À1 (1224 F g À1 ) at a current density of 2 A g À1 .…”