Self-reconstruction mechanism in NiSe2 nanoparticles/carbon fiber paper bifunctional electrocatalysts for water splitting

Ni0.85Se hexagonal nanosheets as an advanced conversion cathode for Mg secondary batteries

“…As a combination of Ni 2 + and Se 2-, nickel selenides have many advantages including high metallic conductivity, high thermal and chemical stability and low cost [20] . Enlightened by the attractive properties, many studies have focused on utilization of nickel selenides as catalysts [21][22][23][24] , supercapacitors [25 , 26] and Li/Naion battery materials [27][28][29][30] . Ni and Se can form varies of stoichiometric and non-stoichiometric compounds (NiSe 2 , Ni 3 Se 2 , NiSe and Ni 0.85 Se) due to their small difference in electronegativity.…”

In situ growth of SeOx films on the surface of Ni–Fe–selenide nanosheets as highly active and stable electrocatalysts for the oxygen evolution reaction

“…32 Lau et al found that both HER and OER process of selenides in alkaline solution were accompanied by surface oxidation, and the oxidation degree and phase transition rate during OER is much stronger and faster, while the oxidation rate during HER was relatively slow. 32 They show that in the initial reaction stage of HER, the outermost layer of selenides (NiSe 2 ) will ionize in strong KOH solution, the Se 2 2will leach out and combine with the dissolved oxygen to generate SeO x , and accompanied by the generation of Ni(OH) 2 /NiOOH. 52 The specific mechanism is shown as follows: 32 (1)…”

“…32 They show that in the initial reaction stage of HER, the outermost layer of selenides (NiSe 2 ) will ionize in strong KOH solution, the Se 2 2will leach out and combine with the dissolved oxygen to generate SeO x , and accompanied by the generation of Ni(OH) 2 /NiOOH. 52 The specific mechanism is shown as follows: 32 (1)…”

Three‐Dimensional Graphene‐Foam‐Supported Hierarchical Nickel Iron Phosphide Nanosheet Arrays as Efficient and Stable Bifunctional Electrocatalysts for Overall Water Splitting

“…It is still a challenging task to prepare a bifunctional electrocatalyst. [12][13][14][15][16] So far, the bifunctional catalysts mainly include transition metal sulfides, [17] selenides, [18] phosphides, [19] nitrides, [20] hydroxides, [21] and so on. Among them, transition metal phosphides (TMPs) (M = Fe, Co, Ni, Cu, etc.)…”

“…However, most catalysts are only active for either OER or HER due to the electrolyte difference and pH range mismatch. It is still a challenging task to prepare a bifunctional electrocatalyst . So far, the bifunctional catalysts mainly include transition metal sulfides, selenides, phosphides, nitrides, hydroxides, and so on.…”